Pallet position detection mechanism for stacking machine

Abstract

The utility model relates to a stacking machine tray position detection mechanism, and relates to the field of stacking machines, the stacking machine tray position detection mechanism comprises two positioning seats fixedly installed on the ground, and a placing groove used for placing a tray is formed between the two positioning seats; the two positioning seats are fixedly connected with driving parts respectively, the driving ends of the driving parts are fixedly connected with positioning plates respectively, the two positioning plates are arranged on the positioning seats in a sliding mode, and the two positioning plates extend into inserting grooves in the two sides of trays at the bottom of a tray pile respectively; and a tray sensing module, a position detection module, a signal processing module and a buzzer. Position detection can be carried out on the to-be-stacked trays, and the situation that due to deviation of the tray pile, the tray pile collapses in the carrying process is reduced.

Description

Technical Field

[0001] The present application relates to the field of stackers, and in particular to a pallet position detection mechanism for a stacker. Background Art

[0002] Warehousing logistics has developed very rapidly, especially large-item warehouse logistics. In order to make the best use of the warehouse area, the warehouse shelves are all large and high-positioned large shelves. Therefore, special crane stackers used to store and retrieve goods from high-rise shelves have come into being. Stackers can be divided into low-rise, medium-rise and high-rise types according to their height. Among them, low-rise stacking cranes refer to those with a lifting height of less than 5m, which are mainly used in split high-rise shelf warehouses and simple stereoscopic warehouses.

[0003] In modern warehousing and logistics, it is often necessary to use a stacker to stack and sort pallets in order to reduce the storage space occupied by pallets. In the prior art, common pallet stackers mainly include a stacker and a stacking frame, and slots for the stacker to extend into are respectively provided on the four side walls of the pallet. In the process of sorting pallets, the pallet is transported to the stacking frame by the stacker, and a positioning plate is driven by a telescopic cylinder on the stacking frame. The positioning plate extends into the slot of the bottom pallet of the pallet stack to set up the pallet stack. After the stacker puts the pallet to be stacked into the stacking frame, the telescopic cylinder drives the positioning plate to extend out of the slots on both sides of the bottom pallet of the pallet stack. When the stacker completely lifts the pallet to be stacked, the positioning plate extends into the slots on both sides of the pallet to be stacked to complete the stacking operation of the pallet.

[0004] However, the existing stacking rack is not equipped with a mechanism for detecting the position of the pallets to be stacked. During the process of stacking pallets by the stacker, the pallets to be stacked and the pallet stack are easily offset, which may easily cause the pallet stack to topple over during the subsequent transfer of the pallet stack. There is room for improvement. Utility Model Content

[0005] In order to detect the positions of pallets to be stacked and reduce the occurrence of the pallet stack collapsing during transportation due to the deviation of the pallet stack, the present application provides a pallet position detection mechanism for a stacker.

[0006] The present application provides a pallet position detection mechanism for a stacker using the following technical solution:

[0007] A pallet position detection mechanism for a stacker, comprising two positioning seats fixedly mounted on the ground, with a placement slot for placing the pallet formed between the two positioning seats;

[0008] The two positioning seats are respectively fixedly connected with driving members, the driving ends of the driving members are respectively fixedly connected with positioning plates, the two positioning plates are slidably arranged on the positioning seats, and the two positioning plates are respectively extended into slots on both sides of the bottom tray of the tray stack; and:

[0009] A pallet sensing module, mounted on the positioning plate, for controlling the driving member to drive the positioning plate to extend out of the slot when the pallet to be stacked lifts up the pallet stack;

[0010] A position detection module, used for detecting the distance between the positioning plate and the to-be-stacked tray and outputting a first distance signal, and the distance between the positioning plate and the tray stack and outputting a second distance signal after the positioning plate is extended for a set time;

[0011] a signal processing module, connected to the signal output terminal of the position detection module, for receiving the first distance signal and the second distance signal and outputting a first control signal when the difference between the first distance and the second distance is too large, and outputting a second control signal when the first distance and the second distance are equal;

[0012] A buzzer, fixedly mounted on any of the positioning seats, for receiving the first control signal and issuing a warning sound;

[0013] The signal input ends of the two driving members are signal-connected to the signal output ends of the signal processing module. The two driving members receive the second control signal and respectively drive the positioning plates to extend into the slots on both sides of the tray to be stacked.

[0014] By adopting the above technical solution, in the process of using the stacker to stack and sort the pallets, the pallet stack is erected above the two positioning seats through the positioning plate, the stacker transfers the pallet to be stacked to the placement slot between the two positioning seats and lifts the pallet to be stacked upwards, when the pallet to be stacked is against the pallet at the bottom of the pallet stack and lifts the pallet stack upwards, the pallet sensing module controls the driving member to drive the two positioning plates to extend out of the slot at the bottom of the pallet stack, after a set time, the position detection module detects the distance between the pallet to be stacked and outputs a first distance signal, detects the distance between the pallet at the bottom of the pallet stack and outputs a second distance signal, and the signal processing module receives the first distance signal and the second distance signal and then compares the first distance with the second distance. When the difference between the first distance and the second distance is large, it can be determined that there is a position offset between the pallet to be stacked and the pallet stack, and the signal processing module controls the buzzer to emit a warning sound to prompt the on-site operator to stop stacking; when the first distance is equal to the second distance, it can be determined that there is no offset between the pallet to be stacked and the pallet stack, the signal processing module outputs a second control signal, and the two driving members drive the two positioning plates to extend into the slots on both sides of the pallet to be stacked to complete the pallet stacking action. Through the coordination and use of the driving parts, positioning plates, pallet sensing modules, position detection modules, signal processing modules and buzzers, it is possible to detect whether there is an offset between the pallet to be stacked and the pallet stack during the pallet stacking process, and to stop the operation of stacking the pallets in time when there is an offset between the pallet to be stacked and the pallet stack, thereby effectively improving the accuracy of pallet stacking and reducing the occurrence of pallet stack collapse during transportation due to stacking offset.

[0015] Preferably, the driving member comprises a telescopic cylinder, a cylinder body of the telescopic cylinder is fixedly connected to the positioning seat, and a cylinder shaft of the telescopic cylinder is fixedly connected to a connecting plate;

[0016] The two positioning seats are respectively provided with sliding grooves matched with the positioning plates, and the two positioning plates are respectively slidably arranged in the two sliding grooves.

[0017] By adopting the above technical solution, the telescopic cylinder extends or retracts the cylinder shaft, which can achieve the technical effect of driving the positioning plate to slide into or out of the slots on both sides of the tray. The slide groove can limit the position and sliding trajectory of the positioning plate, reducing the occurrence of position deviation of the positioning plate during the sliding process.

[0018] Preferably, the positioning seats are all fixedly connected with fixing blocks, a guide rod is fixedly connected between the two fixing blocks, and the bottom of the connecting plate is slidably matched with the guide rod;

[0019] A spring is coaxially sleeved on the guide rod, and the spring is tightly pressed between the fixing block and the connecting plate.

[0020] By adopting the above technical solution, the guide rod can limit the sliding trajectory of the connecting plate, thereby improving the stability of the sliding movement of the positioning plate driven by the telescopic cylinder. The spring on the guide rod can improve the movement stability of the positioning plate driven by the telescopic cylinder to extend out of the slot and accelerate the movement of the positioning plate driven by the telescopic cylinder to extend into the slot.

[0021] Preferably, the tray sensing module comprises:

[0022] A thin film pressure sensor, fixedly mounted on the surface of any of the positioning plates, for detecting the contact pressure between the positioning plate and the pallet stack and outputting a contact pressure signal;

[0023] A first comparator is connected to the signal output terminal of the thin film pressure sensor, and is used to receive and compare the contact pressure signal, and output a third control signal when the contact pressure is less than a set pressure value;

[0024] The signal input ends of the two telescopic cylinders are signal-connected to the signal output end of the first comparator, and the two telescopic cylinders receive the third control signal and retract the cylinder shafts.

[0025] By adopting the above technical solution, the film pressure sensor can detect the contact pressure between the film pressure sensor and the pallet stack in real time. When the stacker lifts the pallet to be stacked and the top of the pallet to be stacked lifts the pallet stack, the contact pressure value measured by the film pressure sensor becomes smaller. When the contact pressure value is less than the set pressure value, the first comparator outputs a third control signal, and the two telescopic cylinders retract the cylinder shafts to drive the positioning plates to extend out of the slots on both sides of the bottom pallet of the pallet stack, so as to facilitate the continuous lifting of the pallet to be stacked.

[0026] Preferably, a mounting plate is fixedly connected to any of the positioning seats, and the position detection module comprises:

[0027] a timing unit, signal-connected to the signal output terminal of the first comparator, configured to receive the third control signal and output a trigger signal after a set time period;

[0028] A first laser distance measuring sensor, fixedly mounted on the mounting plate, facing the tray to be stacked, and connected to the signal output terminal of the timing unit, for receiving the trigger signal, detecting the distance between the tray to be stacked, and outputting the first distance signal;

[0029] The second laser distance measuring sensor is fixedly mounted on the mounting plate, opposite to the bottom pallet of the pallet stack, and is connected to the signal output end of the timing unit for receiving the trigger signal, detecting the distance to the bottom pallet of the pallet stack, and outputting the second distance signal.

[0030] By adopting the above technical solution, the telescopic cylinder drives the positioning plate to extend out of the slots on both sides of the bottom pallet of the pallet stack, and the timing unit starts timing, and at the set time (the time required for the stacker to complete the lifting action of the pallet to be stacked), controls the first laser ranging sensor and the second laser ranging sensor to respectively detect the distance between the pallet to be stacked and the distance between the pallet stacks, and output the first distance and the second distance respectively.

[0031] Preferably, the timing unit comprises:

[0032] A timer, signal-connected to the signal output terminal of the first comparator, configured to receive the trigger signal, start timing, and output a sensing duration signal;

[0033] A second comparator is connected to the signal output terminal of the timer, and is used to receive and compare the sensing duration signal, and output the trigger signal when the sensing duration reaches a set duration;

[0034] The signal output terminal of the second comparator is signal-connected to the signal input terminal of the timer, and the timer receives the trigger signal and is reset.

[0035] By adopting the above technical solution, the timer starts timing while the telescopic cylinder retracts the cylinder shaft, and the second comparator compares the sensing time. When the sensing time reaches the set time and the stacker completes the lifting action of the pallet to be stacked, the second comparator outputs a trigger signal to trigger the first laser ranging sensor and the second laser ranging sensor, and reset the timer at the same time.

[0036] Preferably, the signal processing module includes a single chip microcomputer, and a signal output terminal of the single chip microcomputer is signal-connected to the buzzer and the signal input terminals of the two telescopic cylinders.

[0037] By adopting the above technical solution, the single chip microcomputer can compare the first distance and the second distance. When the first distance is the same as the second distance, it can be determined that there is no position offset between the pallet to be stacked and the pallet stack, and the telescopic cylinder is controlled to drive the positioning plate to extend into the slot of the pallet to be stacked; when the difference between the first distance and the second distance is large, it can be determined that there is an offset between the pallet to be stacked and the pallet stack, and the buzzer can be controlled to sound a warning sound.

[0038] In summary, the present invention provides a pallet position detection mechanism for a stacker, which has at least one of the following beneficial technical effects:

[0039] 1. Through the coordination and use of the telescopic cylinder, the positioning plate, the film pressure sensor, the first comparator, the timer, the second comparator, the first laser distance sensor, the second laser distance sensor, the single chip microcomputer and the buzzer, it is possible to detect whether there is an offset between the pallet to be stacked and the pallet stack during the pallet stacking process, and to stop the operation of stacking the pallets in time when there is an offset between the pallet to be stacked and the pallet stack, which can effectively improve the accuracy of pallet stacking and reduce the occurrence of the pallet stack collapsing during the handling process due to the stacking offset;

[0040] 2. By using the guide rod and the spring together, the position of the connecting plate can be restricted, reducing the displacement of the connecting plate when the telescopic cylinder drives the connecting plate to slide, and improving the stability of the telescopic cylinder driving the positioning plate to extend into and out of the slot. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic diagram used to illustrate the pallet stacking process according to an embodiment of the present application.

[0042] Figure 2 It is a schematic diagram of an embodiment of the present application for illustrating the overall structure of two positioning seats.

[0043] Figure 3 It is a schematic diagram of an embodiment of the present application for demonstrating the overall structure of a position detection mechanism.

[0044] Explanation of the accompanying drawings: 1. Positioning seat; 11. Slide groove; 12. Fixed block; 13. Guide rod; 14. Spring; 15. Mounting plate; 151. First laser ranging sensor; 152. Second laser ranging sensor; 2. Placement groove; 3. Driving member; 31. Positioning plate; 32. Connecting plate; 4. Pallet stack; 5. Buzzer; 6. Film pressure sensor; 7. Pallet to be stacked. DETAILED DESCRIPTION

[0045] The following is combined with Figure 1-3 This application is described in further detail.

[0046] Example

[0047] The present application embodiment discloses a pallet position detection mechanism for a stacker. Figure 1-Figure 3 It mainly includes two positioning seats 1 fixedly installed on the ground, and a placement groove 2 for placing the pallet is formed between the two positioning seats 1.

[0048] The two positioning seats 1 are respectively fixedly connected with driving members 3, and the driving ends of the driving members 3 are respectively fixedly connected with positioning plates 31. The two positioning plates 31 are slidably arranged on the positioning seats 1, and the two positioning plates 31 extend into the slots on both sides of the bottom tray of the tray stack 4 respectively.

[0049] And: a pallet sensing module, installed on the positioning plate 31, used for controlling the driving member 3 to drive the positioning plate 31 to extend out of the slot when the pallet to be stacked lifts up the pallet stack 4; a position detection module, used for detecting the distance between the positioning plate 31 and the pallet 7 to be stacked and outputting a first distance signal, and the distance between the positioning plate 31 and the pallet stack 4 and outputting a second distance signal after the positioning plate 31 extends for a set period of time; a signal processing module, connected to the signal output end of the position detection module, used for receiving the first distance signal and the second distance signal and outputting a first control signal when the difference between the first distance and the second distance is too large, and outputting a second control signal when the first distance and the second distance are equal; a buzzer 5, fixedly installed on any positioning seat 1, used for receiving the first control signal and issuing a warning sound.

[0050] The signal input ends of the two driving members 3 are signal-connected to the signal output ends of the signal processing module. The two driving members 3 receive the second control signal and respectively drive the positioning plates 31 to extend into the slots on both sides of the tray 7 to be stacked.

[0051] When using a stacker to stack and sort pallets, the pallet stack 4 is erected above the two positioning seats 1 through the positioning plate 31. The stacker transfers the pallet 7 to be stacked to the placement slot 2 between the two positioning seats 1 and lifts the pallet 7 to be stacked upward. When the pallet 7 to be stacked is abutted against the bottom pallet of the pallet stack 4 and the pallet stack 4 is lifted upward, the pallet sensing module controls the driving component 3 to drive the two positioning plates 31 to extend out of the slots at the bottom of the pallet stack 4. After a set period of time, the position detection module detects the distance between the pallet 7 to be stacked and outputs a first distance signal, detects the distance between the pallet and the bottom pallet of the pallet stack 4 and outputs a second distance signal, and the signal processing module receives the first distance signal and the second distance signal and then compares the first distance with the second distance.

[0052] When the difference between the first distance and the second distance is large, it can be determined that there is a position offset between the tray to be stacked 7 and the tray stack 4, and the signal processing module controls the buzzer 5 to emit a warning sound to prompt the on-site operator to stop stacking; when the first distance is equal to the second distance, it can be determined that there is no offset between the tray to be stacked 7 and the tray stack 4, and the signal processing module outputs a second control signal, and the two driving parts 3 drive the two positioning plates 31 to extend into the slots on both sides of the tray to be stacked 7 to complete the stacking action of the tray stack 4.

[0053] By matching and using the driving member 3, the positioning plate 31, the pallet sensing module, the position detection module, the signal processing module and the buzzer 5, it is possible to detect whether there is an offset between the pallet 7 to be stacked and the pallet stack 4 during the stacking process of the pallet stack 4, and to stop the operation of stacking the pallets in time when there is an offset between the pallet 7 to be stacked and the pallet stack 4, thereby effectively improving the stacking accuracy of the pallet stack 4 and reducing the occurrence of the pallet stack 4 collapsing during transportation due to stacking offset.

[0054] Reference Figure 1 and Figure 2 The driving member 3 adopts a telescopic cylinder, the cylinder body of the telescopic cylinder is fixedly connected to the positioning seat 1, and the cylinder shaft of the telescopic cylinder is fixedly connected to a connecting plate 32; the two positioning seats 1 are respectively provided with sliding grooves 11 adapted to the positioning plates 31, and the two positioning plates 31 are respectively slidably set in the two sliding grooves 11.

[0055] The telescopic cylinder extends or retracts the cylinder shaft to achieve the technical effect of driving the positioning plate 31 to slide into or out of the slots on both sides of the tray. The slide groove 11 can limit the position and sliding track of the positioning plate 31 to reduce the occurrence of position deviation of the positioning plate 31 during the sliding process.

[0056] Reference Figure 2 A fixing block 12 is fixedly connected to the positioning seat 1, a guide rod 13 is fixedly connected between the two fixing blocks 12, and the bottom of the connecting plate 32 is slidably matched with the guide rod 13; a spring 14 is coaxially sleeved on the guide rod 13, and the spring 14 is tightly pressed between the fixing block 12 and the connecting plate 32.

[0057] The guide rod 13 can limit the sliding trajectory of the connecting plate 32, thereby improving the stability of the sliding movement of the telescopic cylinder driving the positioning plate 31. The spring 14 on the guide rod 13 can improve the movement stability of the telescopic cylinder driving the positioning plate 31 to extend out of the slot and accelerate the movement of the telescopic cylinder driving the positioning plate 31 to extend into the slot.

[0058] Reference Figure 2 and Figure 3 The pallet sensing module includes: a film pressure sensor 6, which is fixedly installed on the surface of any positioning plate 31, and is used to detect the contact pressure between the pallet stack 4 and output a contact pressure signal; a first comparator, which is signal-connected to the signal output end of the film pressure sensor 6, and is used to receive and compare the contact pressure signal, and output a third control signal when the contact pressure is less than a set pressure value; the signal input ends of the two telescopic cylinders are signal-connected to the signal output ends of the first comparator, and the two telescopic cylinders receive the third control signal and retract the cylinder shaft.

[0059] The film pressure sensor 6 can detect the contact pressure between it and the pallet stack 4 in real time. When the stacker lifts the pallet 7 to be stacked and the top of the pallet 7 to be stacked lifts the pallet stack 4, the contact pressure value measured by the film pressure sensor 6 becomes smaller. When the contact pressure value is less than the set pressure value, the first comparator outputs a third control signal, and the two telescopic cylinders retract the cylinder shafts, driving the positioning plate 31 to extend out of the slots on both sides of the bottom pallet of the pallet stack 4, so as to facilitate the continuous lifting of the pallet 7 to be stacked.

[0060] Reference Figure 2 and Figure 3, a mounting plate 15 is fixedly connected to any positioning seat 1, and the position detection module includes: a timing unit, which is signal-connected to the signal output end of the first comparator, and is used to receive the third control signal and output a trigger signal after a set time; a first laser ranging sensor 151, which is fixedly mounted on the mounting plate 15, facing the tray 7 to be stacked, and is signal-connected to the signal output end of the timing unit, and is used to receive the trigger signal and detect the distance to the tray 7 to be stacked and output a first distance signal; a second laser ranging sensor 152, which is fixedly mounted on the mounting plate 15, facing the bottom tray of the tray stack 4, and is signal-connected to the signal output end of the timing unit, and is used to receive the trigger signal and detect the distance to the bottom tray of the tray stack 4 and output a second distance signal.

[0061] While the telescopic cylinder drives the positioning plate 31 to extend out of the slots on both sides of the bottom tray of the tray stack 4, the timing unit starts timing and controls the first laser ranging sensor 151 and the second laser ranging sensor 152 to respectively detect the distance between the tray to be stacked 7 and the distance between the tray stacks 4 within the set time (the time required for the stacker to complete the lifting action of the tray to be stacked 7), and output the first distance and the second distance respectively.

[0062] Reference Figure 3 The timing unit includes: a timer, which is signal-connected to the signal output end of the first comparator, used to receive a trigger signal and start timing, and output a sensing duration signal; a second comparator, which is signal-connected to the signal output end of the timer, used to receive and compare the sensing duration signal, and output a trigger signal when the sensing duration reaches a set duration; the signal output end of the second comparator is signal-connected to the signal input end of the timer, and the timer receives the trigger signal and is reset.

[0063] While the telescopic cylinder retracts the cylinder shaft, the timer starts timing, and the second comparator compares the sensing time. When the sensing time reaches the set time and the stacker completes the lifting action of the pallet to be stacked 7, the second comparator outputs a trigger signal to trigger the first laser ranging sensor 151 and the second laser ranging sensor 152, and reset the timer at the same time.

[0064] Reference Figure 3 The signal processing module adopts a single chip microcomputer, and the signal output end of the single chip microcomputer is connected with the buzzer 5 and the signal input ends of the two telescopic cylinders.

[0065] The single chip microcomputer can compare the first distance and the second distance. When the first distance is the same as the second distance, it can be determined that there is no position offset between the tray to be stacked 7 and the tray stack 4, and the telescopic cylinder is controlled to drive the positioning plate 31 to extend into the slot of the tray to be stacked 7; when the difference between the first distance and the second distance is large, it can be determined that there is an offset between the tray to be stacked 7 and the tray stack 4, and the buzzer 5 can be controlled to emit a warning sound.

[0066] The implementation principle of a pallet position detection mechanism for a stacker in an embodiment of the present application is as follows: by using the telescopic cylinder, the positioning plate 31, the film pressure sensor 6, the first comparator, the timer, the second comparator, the first laser ranging sensor 151, the second laser ranging sensor 152, the single-chip microcomputer and the buzzer 5 to match and use each other, it is possible to detect whether there is an offset between the pallet 7 to be stacked and the pallet stack 4 during the stacking process of the pallets 4, and to stop the operation of stacking the pallets in time when there is an offset between the pallet 7 to be stacked and the pallet stack 4, which can effectively improve the stacking accuracy of the pallet stack 4 and reduce the collapse of the pallet stack 4 during transportation due to the stacking offset.

[0067] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A pallet position detection mechanism for a stacker, characterized in that: It comprises two positioning seats (1) fixedly mounted on the ground, and a placement groove (2) for placing a tray is formed between the two positioning seats (1); The two positioning seats (1) are respectively fixedly connected with driving members (3), and the driving ends of the driving members (3) are respectively fixedly connected with positioning plates (31), and the two positioning plates (31) are slidably arranged on the positioning seats (1), and the two positioning plates (31) are respectively extended into slots on both sides of the bottom tray of the tray stack (4); and: a pallet sensing module, mounted on the positioning plate (31), and used to control the driving member (3) to drive the positioning plate (31) to extend out of the slot when the pallet to be stacked lifts up the pallet stack (4); A position detection module, used for detecting the distance between the positioning plate (31) and the to-be-stacked tray (7) and outputting a first distance signal, and the distance between the positioning plate (31) and the tray stack (4) and outputting a second distance signal after the positioning plate (31) is extended for a set period of time; a signal processing module, connected to the signal output terminal of the position detection module, for receiving the first distance signal and the second distance signal and outputting a first control signal when the difference between the first distance and the second distance is too large, and outputting a second control signal when the first distance and the second distance are equal; A buzzer (5) is fixedly mounted on any of the positioning seats (1) and is used to receive the first control signal and emit a warning sound; The signal input ends of the two driving members (3) are signal-connected to the signal output ends of the signal processing module. The two driving members (3) receive the second control signal and respectively drive the positioning plates (31) to extend into the slots on both sides of the tray (7) to be stacked.

2. A pallet position detection mechanism for a stacker according to claim 1, characterized in that: The driving member (3) comprises a telescopic cylinder, the cylinder body of the telescopic cylinder is fixedly connected to the positioning seat (1), and the cylinder shaft of the telescopic cylinder is fixedly connected to a connecting plate (32); The two positioning seats (1) are respectively provided with sliding grooves (11) adapted to the positioning plates (31), and the two positioning plates (31) are respectively slidably arranged in the two sliding grooves (11).

3. A pallet position detection mechanism for a stacker according to claim 2, characterized in that: The positioning seat (1) is fixedly connected with a fixing block (12), a guide rod (13) is fixedly connected between the two fixing blocks (12), and the bottom of the connecting plate (32) is slidably matched with the guide rod (13); A spring (14) is coaxially sleeved on the guide rod (13), and the spring (14) is pressed tightly between the fixing block (12) and the connecting plate (32).

4. The pallet position detection mechanism for a stacker according to claim 2, characterized in that: The tray sensing module comprises: A thin film pressure sensor (6) fixedly mounted on the surface of any of the positioning plates (31) and used for detecting the contact pressure between the sensor and the tray stack (4) and outputting a contact pressure signal; A first comparator, connected to the signal output terminal of the film pressure sensor (6), for receiving and comparing the contact pressure signal, and outputting a third control signal when the contact pressure is less than a set pressure value; The signal input ends of the two telescopic cylinders are signal-connected to the signal output end of the first comparator, and the two telescopic cylinders receive the third control signal and retract the cylinder shafts.

5. The pallet position detection mechanism for a stacker according to claim 4, characterized in that: A mounting plate (15) is fixedly connected to any of the positioning seats (1), and the position detection module comprises: a timing unit, signal-connected to the signal output terminal of the first comparator, configured to receive the third control signal and output a trigger signal after a set time period; A first laser distance measuring sensor (151) is fixedly mounted on the mounting plate (15), facing the tray to be stacked (7), and connected to the signal output end of the timing unit, and is used to receive the trigger signal, detect the distance to the tray to be stacked (7), and output the first distance signal; A second laser distance measuring sensor (152) is fixedly mounted on the mounting plate (15), opposite to the bottom tray of the tray stack (4), and is signal-connected to the signal output end of the timing unit, for receiving the trigger signal and detecting the distance to the bottom tray of the tray stack (4) and outputting the second distance signal.

6. The pallet position detection mechanism for a stacker according to claim 5, characterized in that: The timing unit comprises: A timer, signal-connected to the signal output terminal of the first comparator, configured to receive the trigger signal, start timing, and output a sensing duration signal; A second comparator is connected to the signal output terminal of the timer, and is used to receive and compare the sensing duration signal, and output the trigger signal when the sensing duration reaches a set duration; The signal output terminal of the second comparator is signal-connected to the signal input terminal of the timer, and the timer receives the trigger signal and is reset.

7. The pallet position detection mechanism for a stacker according to claim 6, characterized in that: The signal processing module comprises a single chip microcomputer, and a signal output terminal of the single chip microcomputer is signal-connected to the buzzer (5) and the signal input terminals of the two telescopic cylinders.

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