you can replace LM324 with LM358. use LM358 with two feedback resistors, then you can get non-inverting output value. the load cell output voltage may be in 0.xxmV to few mV. so, when designing amplifier circuit select the input resistors carefully.
but i suggest to use instrumentation amplifier, AD623 to get better result.
Please post your circuit and specification of the load cell, then i can able to answer better.