Stacker board positioning device

Abstract

The utility model discloses a kind of stacking machine stacking board positioning device, including the stacking board positioning device ontology being installed on conveying system, the conveying system includes U-shaped mounting plate and multiple rollers being rotatably installed between U-shaped mounting plate front side inner wall and rear side inner wall, the principle that conveying system is carried out to stacking board is prior art, here specific not otherwise set forth, the stacking board positioning device ontology includes: pressure control positioning mechanism, is installed on U-shaped mounting plate.The utility model is through the setting of a series of structures, different sizes of stacking board can be effectively automatically accurate left and right limit positioning, improve the degree of automation, can effectively avoid that stacking board moves position too much and leads to left and right position deviation, by limiting, can let water tank effectively place in the middle position of stacking board, and can be carried out to stacking board pressure control clamping positioning, can effectively reduce the risk that stacking board is clamped and damaged due to larger clamping force, improve clamping stability.

Description

Technical Field

[0001] This utility model relates to the field of pallet positioning technology, and in particular to a pallet positioning device for a palletizer. Background Technology

[0002] In the automated production process of purified water, water tanks need to be accurately stacked in the center of pallets. Existing palletizing machines, due to uneven pallet placement and wear and tear on the conveying system, sometimes fail to accurately stop the pallets in the required position, preventing the machine from precisely placing the water tanks. To solve this problem, publication number CN203048190U discloses a pallet positioning device for a palletizing machine. This device includes a conveying system, an upper positioning system, and a lower positioning system. The conveying system includes tracks, rollers, and roller shafts. The tracks consist of two parallel steel rails, and the rollers are fixed to the roller shafts. The upper positioning system consists of a cylinder, a guide shaft, a positioning rod, a positioning rod inclined surface, and a cylinder shaft. The cylinder is located above the track, and the positioning rod is located below the track. The cylinder shaft passes through the track, and the cylinder is fixedly connected to the positioning rod through the cylinder shaft passing through the track. Two guide shafts are located on both sides of the cylinder shaft, and the two guide shafts pass through the track and are fixed to the positioning rod. The left end of the positioning rod has a positioning rod inclined surface, which slopes from right to left towards the track. The lower positioning system has the same structure as the upper positioning system and is symmetrically installed on the parallel track below. The pallet positioning device for palletizing machines disclosed in the aforementioned patent uses a positioning rod and a cylinder to position the pallet, reducing the possibility of the pallet not stopping accurately in the required position. However, it still has the following shortcomings in use: 1. The positioning device disclosed in the aforementioned patent lacks a structure for precise automatic positioning of the pallet. It requires manual operation of the cylinder during positioning, resulting in low automation and potential deviations in the left and right positions due to slow operation, which in turn prevents the water tank from being effectively placed in the center of the pallet; 2. It lacks a pressure control structure during clamping and positioning, posing a risk of damaging the pallet due to excessive clamping. In view of the above, this application proposes a pallet positioning device for palletizing machines. Utility Model Content

[0003] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a pallet positioning device for a palletizer.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A pallet positioning device for a palletizer includes a pallet positioning device body installed on a conveying system. The conveying system includes a U-shaped mounting plate and multiple rollers rotatably installed between the front inner wall and the rear inner wall of the U-shaped mounting plate. The principle of the conveying system for conveying pallets is existing technology and will not be described in detail here. The pallet positioning device body includes: The pressure control and positioning mechanism is installed on the U-shaped mounting plate and located above multiple rollers. The pressure control and positioning mechanism is used to control the pressure and position the stack of pallets. An adjustable limit touch control mechanism is installed on a U-shaped mounting plate and located on the right side of the pressure control and positioning mechanism. The adjustable limit touch control mechanism is used to precisely limit the position of the pallet. The PLC controller is fixedly connected to the rear side of the U-shaped mounting plate and electrically connected to the pressure control positioning mechanism and the adjustable limit touch mechanism.

[0005] Preferably, the pressure control and positioning mechanism includes two symmetrically arranged positioning plates. The left side of the side of the two positioning plates that are close to each other is set as an inclined surface. The front and rear sides of the U-shaped mounting plate are fixedly connected to a first electric push rod. The side of the two positioning plates that are far apart from each other is embedded with a pressure sensor. The output shaft end of the first electric push rod is fixedly connected to the corresponding pressure sensor. The pressure sensor is used to detect the squeezing force during clamping and positioning. The side of the two positioning plates that are far apart from each other is fixedly connected to two L-shaped positioning rods. The U-shaped mounting plate is slidably sleeved on the four L-shaped positioning rods. The L-shaped positioning rods have a positioning effect on the corresponding positioning plates. The PLC controller is electrically connected to the two pressure sensors and the two first electric push rods. The PLC controller receives the signals from the pressure sensors and controls the first electric push rods. The control principle is existing technology and will not be described in detail here.

[0006] Preferably, the adjustable limiting touch control mechanism includes a limiting plate located above multiple rollers. The limiting plate limits the position of the pallet conveyed to the right. An L-shaped moving rod is fixedly connected to the rear side of the limiting plate. A first through hole with an open top is opened on the inner rear wall of the U-shaped mounting plate. The L-shaped moving rod extends through the first through hole to the rear side of the U-shaped mounting plate. A second electric push rod is provided in the first through hole. The output shaft end of the second electric push rod is fixedly connected to the inner rear wall of the L-shaped moving rod. The second electric push rod, in conjunction with the L-shaped moving rod, adjusts the front and rear position of the limiting plate. A first positioning rod is fixedly connected to the right side of the second electric push rod. The U-shaped mounting plate is slidably sleeved on the first positioning rod. The first positioning rod... The second electric push rod serves as a lateral guide. The right side of the second electric push rod and the rear side of the U-shaped mounting plate are fixedly connected to the same movable locking assembly. A tactile switch is fixedly connected to the left side of the limit plate. A first monitoring sensor and a second monitoring sensor are fixedly connected to the top of the limit plate. The monitoring end of the first monitoring sensor is set to the left, and the monitoring end of the second monitoring sensor is set to the front. The second electric push rod, the tactile switch, the first monitoring sensor, and the second monitoring sensor are all electrically connected to the PLC controller. The first monitoring sensor and the second monitoring sensor are used to monitor the situation of placing a water tank on top of the pallet and the situation of the pallet being conveyed to the right, respectively. The monitoring principle is existing technology and will not be elaborated here.

[0007] Preferably, the movable locking assembly includes a positioning sleeve fixedly connected to the rear side of the U-shaped mounting plate, a guide rod fixedly connected to the right side of the second electric push rod, a hard rubber sheet bonded to the rear side of the guide rod, the positioning sleeve slidably sleeved on the guide rod and the hard rubber sheet, a T-shaped clamping bolt tightly contacting the rear side of the hard rubber sheet, and the positioning sleeve threaded onto the T-shaped clamping bolt. Under the frictional force between the T-shaped clamping bolt and the hard rubber sheet, the guide rod can be fixed, thereby fixing the second electric push rod.

[0008] Preferably, a synchronization control switch is fixedly connected to the right side of the first electric push rod on the rear side. The synchronization control switch is electrically connected to the two first electric push rods and the PLC controller. The synchronization control switch is used to control the two first electric push rods to open synchronously.

[0009] Preferably, a limit block is fixedly connected to the right end of the guide rod, and a bolt hole is provided on the inner rear wall of the positioning sleeve, which is threadedly connected to a T-shaped clamping bolt.

[0010] Preferably, a positioning hole is provided on the inner wall of the right side of the first through hole, and the inner wall of the positioning hole is in movable contact with the outer side of the first positioning rod.

[0011] Compared with existing technologies, the beneficial effects of this utility model are: By combining a PLC controller and an adjustable limit touch control mechanism, the pallet can be positioned and clamped under controlled pressure. This controlled pressure clamping effectively reduces the risk of damaging the pallet due to excessive clamping force and improves clamping stability. By setting an adjustable limit touch control mechanism, the pallet can be precisely limited, avoiding excessive movement of the pallet and resulting in left and right position deviations. Through the limit, the water tank can be effectively placed in the middle of the pallet, improving the positioning effect. In conjunction with the PLC controller, automatic and accurate positioning can be achieved. The limit plate can be automatically adjusted according to the pallet conveying and water tank placement, thereby effectively improving the degree of automation. In addition, the adjustable position of the limit plate makes it suitable for precise positioning of pallets of different sizes, expanding the applicability range. This utility model, through a series of structural settings, can effectively and accurately limit and position pallets of different sizes to the left and right, improve the degree of automation, and effectively avoid the left and right position deviation caused by excessive movement of the pallets. Through the limiting, the water tank can be effectively placed in the middle of the pallet, and the pallet can be clamped and positioned by controlled pressure, which can effectively reduce the risk of damage to the pallet due to large clamping force and improve clamping stability. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of a pallet positioning device for a palletizer proposed in this utility model; Figure 2 This is a top sectional view of the pallet positioning device for a palletizer proposed in this utility model. Figure 3 for Figure 2 A magnified structural diagram of part A in the middle.

[0013] In the diagram: 1. Conveying system; 101. U-shaped mounting plate; 102. First through hole; 2. Pressure control and positioning mechanism; 201. First electric push rod; 202. Synchronous control switch; 203. Positioning plate; 204. L-shaped positioning rod; 205. Pressure sensor; 3. Adjustable limit touch control mechanism; 301. Limiting plate; 302. First monitoring sensor; 303. Tactile switch; 304. Second monitoring sensor; 305. L-shaped moving rod; 306. Second electric push rod; 307. First positioning rod; 308. Guide rod; 309. Positioning sleeve; 310. T-shaped clamping bolt; 4. PLC controller. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0015] Reference Figure 1-3 A pallet positioning device for a palletizing machine includes a pallet positioning device body installed on a conveying system 1. The conveying system 1 includes a U-shaped mounting plate 101 and multiple rollers rotatably installed between the front inner wall and the rear inner wall of the U-shaped mounting plate 101. The principle of conveying pallets by the conveying system 1 is existing technology and will not be described in detail here. The pallet positioning device body includes: The PLC controller 4 is fixedly connected to the rear side of the U-shaped mounting plate 101; The pressure control and positioning mechanism 2 is installed on the U-shaped mounting plate 101 and located above multiple rollers. The pressure control and positioning mechanism 2 is used to control the pressure and position the stack of plates. The pressure control and positioning mechanism 2 includes two symmetrically arranged positioning plates 203. The left side of the side of the two positioning plates 203 that is close to each other is inclined. A first electric push rod 201 is fixedly connected to the front and rear sides of the U-shaped mounting plate 101. A pressure sensor 205 is embedded and fixedly installed on the side of the two positioning plates 203 that is far from each other. A groove is formed on the side of the two positioning plates 203 that is far from each other. The pressure sensor 205 is fixedly connected to the inner wall of the corresponding groove on the side away from its opening. The output shaft end of the first electric push rod 201 is fixedly connected to the corresponding pressure sensor 205. The pressure sensor 205 is used to detect the squeezing force during clamping and positioning. Two L-shaped positioning rods 204 are fixedly connected to the side of the two positioning plates 203 that is far from each other. The U-shaped mounting plate 101 is slidably sleeved on the four L-shaped positioning rods. On rod 204, two sliding holes are opened on the front inner wall and the rear inner wall of the U-shaped mounting plate 101. The inner wall of the sliding hole slides in contact with the outer side of the corresponding L-shaped positioning rod 204. The L-shaped positioning rod 204 positions the corresponding positioning plate 203. PLC controller 4 is electrically connected to two pressure sensors 205 and two first electric push rods 201. PLC controller 4 receives the signal from pressure sensor 205 to control the first electric push rod 201. Its control principle is existing technology and will not be described in detail here. A synchronous control switch 202 is fixedly connected to the right side of the rear first electric push rod 201. The synchronous control switch 202 is electrically connected to the two first electric push rods 201 and PLC controller 4. The synchronous control switch 202 is used to control the two first electric push rods 201 to open synchronously.

[0016] In this implementation scheme: During the positioning operation, when the conveying system 1 transports the stack to the right to the set position, the PLC controller 4 controls the two first electric push rods 201 to open in the forward direction through the synchronous control switch 202. The output shaft of the first electric push rod 201 drives the positioning plate 203 to move closer to the stack through the corresponding pressure sensor 205. When the two positioning plates 203 move closer to each other and contact the stack, the first electric push rod 201 squeezes the pressure sensor 205. The pressure sensor 205 detects the pressure value and converts it into a standard electrical signal, which is transmitted to the PLC controller 4. The PLC controller 4 converts the received standard electrical signal into an actual pressure value through analog-to-digital conversion. When the pressure value reaches the preset value, the PLC controller 4 controls the two first electric push rods 201 to close. At this time, the two positioning plates 203 clamp and position the stack.

[0017] It should be noted that: the first electric linear actuator 201 can preferably be a Linak LA36 series electric linear actuator, which has a built-in Hall sensor that can provide the real-time position signal of the actuator and feed it back to the PLC controller 4; the pressure sensor 205 can preferably be an IFM PM series pressure sensor; and the PLC controller 4 can preferably be a Siemens model. In S7-1200, the synchronous control switch 202 is equivalent to a control function or instruction in the program of PLC controller 4. When the position signal is sent to PLC controller 4, the program of PLC controller 4 (i.e., the "synchronous control switch" logic) immediately and simultaneously activates the output point controlling the forward operation of the two first electric push rods 201. The two first electric push rods 201 extend, pushing the pressure sensor 205 and the positioning plate 203 to move towards the stack. Once they contact the stack, the thrust begins to build up. The pressure sensor 205 detects the pressure value in real time and converts it into a 4-20mA analog signal, which is continuously sent to the analog input module of PLC controller 4. The ADC inside PLC controller 4 converts the analog signal into a digital signal and calculates it into the actual pressure value through a formula preset in the program. The program of PLC controller 4 continuously compares the actual pressure value read with the preset pressure value. If the actual pressure value >= the preset pressure value, PLC controller 4 immediately shuts off (stops) the power supply of the motor of the first electric push rod 201.

[0018] Furthermore: A pallet positioning device for a palletizer also includes an adjustable limit touch control mechanism 3, which is installed on a U-shaped mounting plate 101 and located on the right side of the pressure control positioning mechanism 2. The adjustable limit touch control mechanism 3 is used to precisely limit the position of the pallet. The adjustable limit touch control mechanism 3 includes a limit plate 301, which is located above multiple rollers. The limit plate 301 is used to limit the position of the pallet being conveyed to the right. An L-shaped moving rod 305 is fixedly connected to the rear side of the limit plate 301. A first through hole 102 with an open top is opened on the inner wall of the rear side of the U-shaped mounting plate 101. The L-shaped moving rod 305 extends through the first through hole 102 to the rear side of the U-shaped mounting plate 101. A second electric push rod 306 is provided in the first through hole 102. The output shaft end of the second electric push rod 306 is fixedly connected to the inner wall of the rear side of the L-shaped moving rod 305. The second electric push rod 306 cooperates with the L-shaped moving rod 305 to adjust the front and rear position of the limit plate 301. A first positioning rod 307 is fixedly connected to the right side of the second electric push rod 306. The U-shaped mounting plate 101 is slidably sleeved on the first positioning rod 307. A positioning hole is provided on the inner wall of the right side of hole 102. The inner wall of the positioning hole is in movable contact with the outer side of the first positioning rod 307. The first positioning rod 307 plays a lateral guiding role for the second electric push rod 306. A tactile switch 303 is fixedly connected to the left side of the limiting plate 301. A first monitoring sensor 302 and a second monitoring sensor 304 are fixedly connected to the top of the limiting plate 301. The monitoring end of the first monitoring sensor 302 is set to the left, and the monitoring end of the second monitoring sensor 304 is set to the front. The second electric push rod 306, the tactile switch 303, the first monitoring sensor 302 and the second monitoring sensor 304 are all electrically connected to the PLC controller 4. The first monitoring sensor 302 and the second monitoring sensor 304 are used to monitor the situation of placing a water tank on the top of the stack and the situation of the stack being conveyed to the right, respectively. The monitoring principle is existing technology and will not be described in detail here. The right side of the second electric push rod 306 and the rear side of the U-shaped mounting plate 101 are fixedly connected to the same movable locking assembly. The movable locking assembly includes a positioning sleeve 309 fixedly connected to the rear side of the U-shaped mounting plate 101. A guide rod 308 is fixedly connected to the right side of the second electric push rod 306. A hard rubber sheet is bonded to the rear side of the guide rod 308. The positioning sleeve 309 is slidably sleeved on the guide rod 308 and the hard rubber sheet. A T-shaped clamping bolt 310 is in close contact with the rear side of the hard rubber sheet. The positioning sleeve 309 is threaded onto... On the T-shaped clamping bolt 310, a limiting block is fixedly connected to the right end of the guide rod 308. The limiting block has the effect of limiting and preventing the guide rod 308 from falling off. The positioning sleeve 309 has a bolt hole on its rear inner wall. The bolt hole is threadedly connected to the T-shaped clamping bolt 310. The T-shaped clamping bolt 310 rotates in the bolt hole and moves laterally. Under the action of friction between the T-shaped clamping bolt 310 and the hard rubber, the guide rod 308 can be fixed, thereby fixing the second electric push rod 306.

[0019] In this implementation: when the pallet is conveyed to the right and contacts the tactile switch 303, the tactile switch 303 is triggered and opened. The tactile switch 303 transmits the opening signal to the PLC controller 4. The PLC controller 4 controls the two first electric push rods 201 to open in the forward direction through the synchronous control switch 202. Before positioning, when adjusting the position of the limiting plate 301 according to the length of the stack, the T-shaped clamping bolt 310 is rotated in the reverse direction. Simultaneously, the T-shaped clamping bolt 310 rotates and moves to separate from the hard rubber, releasing the fixation on the guide rod 308, thereby releasing the fixation on the second electric push rod 306. At this point, the second electric push rod 306 can be moved to the left, causing the first positioning rod 307 to move laterally. The second electric push rod 306, through the L-shaped moving rod 305, causes the limiting plate 301 to move to the left. The limiting plate 301 then causes the tactile switch 303 to move to the left. When the distance between the middle of the limiting plate 301 and the positioning plate 203 is half the length of the stack, the second electric push rod 306 can be stopped, and the T-shaped clamping bolt 310 can be rotated in the forward direction to move it into close contact with the hard rubber. Under the action of the friction between the T-shaped clamping bolt 310 and the hard rubber, the guide rod 308 can be fixed, thereby fixing the second electric push rod 306 and the limiting plate 301. By adjusting the position of the limiting plate 301, it can be used to accurately position stacks of different sizes. In addition, after positioning, the first monitoring sensor 302 monitors the placement status of the top of the stack and transmits the monitoring image to the PLC controller 4. After monitoring that the water tank has been placed, the PLC controller 4 controls the second electric push rod 306 to open in the forward direction. The output shaft of the second electric push rod 306 drives the limit plate 301 to move backward through the L-shaped moving rod 305. When the limit plate 301 moves backward to the set position, the PLC controller 4 controls the second electric push rod 306 to close and simultaneously controls the two first electric push rods 201 to open in the reverse direction, so that the two positioning plates 203 change to move away from each other to release the clamping of the stack. The conveying system 1 can then continue to convey the stack to the right. At the same time, the second monitoring sensor 304 monitors the conveying of the stack and transmits the data to the PLC controller 4. When monitoring that the stack has been conveyed to the right side of the limit plate 301, the PLC controller 4 controls the second electric push rod 306 to open in the reverse direction, so that the limit plate 301 drives the components on it to move forward to reset.

[0020] It should be noted that: the tactile switch 303 can preferably be the OMRON SS-5GL2, which is a small roller plunger type limit switch; the second electric push rod 306 can preferably be the Linak LA25 series electric push rod; the first monitoring sensor 302 and the second monitoring sensor 304 can preferably be the SICK WL12-2P2462, both of which are photoelectric sensors. The specific control principle is that when the front end of the pallet blocks the light path of the first monitoring sensor 302, the sensor output signal changes from OFF(0) to ON(1). This rising edge signal is captured by the input point of the PLC controller 4. There is a line of logic in the PLC controller 4 program: IF I0.0 THENQ0.0, where Q0.0 is the output point that controls the second electric push rod 306. When the pallet has completely passed through, the light path is restored (or leaves the detection area), and the output of the second monitoring sensor 304 changes from ON(1) back to OFF(0). This falling edge signal is captured by the input point of the PLC controller 4 (assuming it is I0.1). The PLC controller 4 program judges: IF I0.1 has fallen AND other conditions satisfy THENQ0.1, where Q0.1 is the output point that controls the second electric actuator 306 to reverse; In terms of power supply, the mains power is connected to the power input interface of each device through conventional power distribution devices such as circuit breakers, contactors, and power modules (not marked in the figure) and flexible wires to form a complete power supply circuit. Since the second electric push rod 306 is a moving part, the flexible wires connected to it adopt a conventional wiring method with a suitable bending length to meet its displacement requirements. This power supply scheme is a conventional power distribution method for industrial equipment and a mature and well-known technical means, so it will not be described in detail here.

[0021] Working Principle: During use, the robotic arm on the palletizer is positioned in the middle of the positioning plate 203, allowing the water tank to be placed between the two positioning plates 203. The position of the limiting plate 301 is pre-adjusted according to the length of the pallet, ensuring the distance between the limiting plate 301 and the middle of the positioning plate 203 is half the length of the pallet. During adjustment, the T-shaped clamping bolt 310 is rotated in the reverse direction. Simultaneously, the T-shaped clamping bolt 310 moves and separates from the hard rubber, releasing the fixation on the guide rod 308, thereby releasing the fixation on the second electric push rod 306. At this point, the second electric push rod 306 can be moved to the left. The second electric push rod 306 drives the first positioning rod 307 to move laterally. The second electric push rod 306, through the L-shaped moving rod 305, drives the limiting plate 301 to move to the left. The limiting plate 301 then activates the tactile switch 30. 3. Move to the left. While the limiting plate 301 moves, it can be measured by an external ruler. When the distance between the middle of the limiting plate 301 and the positioning plate 203 is half the length of the stack, the second electric push rod 306 can be stopped, and the T-shaped clamping bolt 310 can be rotated in the forward direction to move it into close contact with the hard rubber. Under the friction between the T-shaped clamping bolt 310 and the hard rubber, the guide rod 308 can be fixed, thereby fixing the second electric push rod 306 and the limiting plate 301. With the setting of the limiting plate 301, when clamping and positioning the stack, the positioning plate 203 contacts the middle of the side of the stack, thereby accurately positioning the stack left and right. By adjusting the position of the limiting plate 301, it can be used to accurately position stacks of different sizes, thus improving the applicability. During the positioning operation, the pressure value for closing the first electric push rod 201 and the opening and closing screen of the second electric push rod 306 are preset via the PLC controller 4. The opening travel distance of the second electric push rod 306 is also preset. After the settings are complete, when the pallet is conveyed to the right and contacts the tactile switch 303, the tactile switch 303 is triggered and transmits an opening signal to the PLC controller 4. The PLC controller 4 controls the two first electric push rods 201 to open in the forward direction via the synchronous control switch 202. The output shaft of the first electric push rod 201 drives the positioning plate 203 to move closer to the pallet via the corresponding pressure sensor 205. When the two positioning plates 203 move closer to each other and contact the pallet, the first electric push rod 201 presses against the pressure sensor 205. Pressure sensor 205 detects pressure values ​​and converts them into standard electrical signals, which are then transmitted to PLC controller 4. PLC controller 4 converts the received standard electrical signals into actual pressure values ​​via analog-to-digital conversion. When the pressure value reaches a preset value, PLC controller 4 controls the two first electric push rods 201 to close. At this time, the two positioning plates 203 clamp and position the stack. By controlling the pressure and clamping, the risk of damaging the stack due to excessive clamping force can be effectively reduced, improving clamping stability. Furthermore, the limit plate 301 and the tactile switch 303 work together to limit the stack. With the control of PLC controller 4, the stack can be accurately and automatically positioned left and right, improving the degree of automation and reducing the possibility of left and right position deviations due to slow operation. This allows the water tank to be effectively placed in the middle of the stack, improving the positioning effect. After positioning, the external robotic arm can place the water tank in the middle of the stack. Simultaneously, the first monitoring sensor 302 monitors the placement status of the top of the stack and transmits the monitoring image to the PLC controller 4. Once the water tank placement is complete, the PLC controller 4 controls the second electric push rod 306 to open forward. The output shaft of the second electric push rod 306 drives the limit plate 301 to move backward via the L-shaped moving rod 305. When the limit plate 301 moves backward to the set position, the PLC controller 4 controls the second electric push rod 306 to close, and simultaneously controls the two first electric push rods 201 to open in reverse, causing the two positioning plates 2... 03. The mechanism changes to move away from each other to release the clamping of the pallet. The conveying system 1 can then continue to convey the pallet to the right. At the same time, the second monitoring sensor 304 monitors the conveying of the pallet and transmits the data to the PLC controller 4. When the PLC controller 4 detects that the pallet has been conveyed to the right side of the limit plate 301, it controls the second electric push rod 306 to open in the reverse direction. This causes the limit plate 301 to move forward and reset, ready for the next limit operation. The system also automatically adjusts the limit plate 301 according to the conveying status of the pallet and the placement of the water tank, further improving the level of automation.

[0022] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A pallet positioning device for a palletizer, comprising a pallet positioning device body mounted on a conveying system (1), wherein the conveying system (1) includes a U-shaped mounting plate (101) and a plurality of rollers rotatably mounted between the front inner wall and the rear inner wall of the U-shaped mounting plate (101), characterized in that, The pallet positioning device body includes: The pressure control and positioning mechanism (2) is installed on the U-shaped mounting plate (101) and is located above multiple rollers; An adjustable limit touch control mechanism (3) is installed on a U-shaped mounting plate (101) and located to the right of the pressure control and positioning mechanism (2); The PLC controller (4) is fixedly connected to the rear side of the U-shaped mounting plate (101) and electrically connected to the pressure control positioning mechanism (2) and the adjustable limit touch mechanism (3).

2. The pallet positioning device for a palletizer according to claim 1, characterized in that, The pressure control and positioning mechanism (2) includes two symmetrically arranged positioning plates (203). The left side of the two positioning plates (203) that are close to each other is set as an inclined surface. The front and rear sides of the U-shaped mounting plate (101) are fixedly connected to the first electric push rod (201). The two positioning plates (203) that are far apart from each other are embedded and fixedly fitted with pressure sensors (205). The output shaft end of the first electric push rod (201) is fixedly connected to the corresponding pressure sensor (205). The two positioning plates (203) that are far apart from each other are fixedly connected to two L-shaped positioning rods (204). The U-shaped mounting plate (101) is slidably sleeved on the four L-shaped positioning rods (204). The PLC controller (4) is electrically connected to the two pressure sensors (205) and the two first electric push rods (201).

3. The pallet positioning device for a palletizer according to claim 1, characterized in that, The adjustable limit touch mechanism (3) includes a limit plate (301), which is located above multiple rollers. An L-shaped moving rod (305) is fixedly connected to the rear side of the limit plate (301). A first through hole (102) with an open top is provided on the inner wall of the rear side of the U-shaped mounting plate (101). The L-shaped moving rod (305) extends through the first through hole (102) to the rear side of the U-shaped mounting plate (101). A second electric push rod (306) is provided in the first through hole (102). The output shaft end of the second electric push rod (306) is fixedly connected to the inner wall of the rear side of the L-shaped moving rod (305). A first positioning rod (307) is fixedly connected to the right side of the second electric push rod (306). The mounting plate (101) is slidably sleeved on the first positioning rod (307). The right side of the second electric push rod (306) and the rear side of the U-shaped mounting plate (101) are fixedly connected to the same movable locking assembly. The left side of the limiting plate (301) is fixedly connected to a tactile switch (303). The top of the limiting plate (301) is fixedly connected to a first monitoring sensor (302) and a second monitoring sensor (304). The monitoring end of the first monitoring sensor (302) is set to the left, and the monitoring end of the second monitoring sensor (304) is set to the front. The second electric push rod (306), the tactile switch (303), the first monitoring sensor (302) and the second monitoring sensor (304) are all electrically connected to the PLC controller (4).

4. A pallet positioning device for a palletizer according to claim 3, characterized in that, The movable locking assembly includes a positioning sleeve (309) fixedly connected to the rear side of the U-shaped mounting plate (101), a guide rod (308) fixedly connected to the right side of the second electric push rod (306), a hard rubber sheet bonded to the rear side of the guide rod (308), the positioning sleeve (309) slidingly sleeved on the guide rod (308) and the hard rubber sheet, a T-shaped clamping bolt (310) tightly contacting the rear side of the hard rubber sheet, and the positioning sleeve (309) threadedly sleeved on the T-shaped clamping bolt (310).

5. A pallet positioning device for a palletizer according to claim 2, characterized in that, A synchronous control switch (202) is fixedly connected to the right side of the first electric push rod (201) on the rear side. The synchronous control switch (202) is electrically connected to the two first electric push rods (201) and the PLC controller (4).

6. A pallet positioning device for a palletizer according to claim 4, characterized in that, The guide rod (308) is fixedly connected to the right end of the limit block, and the positioning sleeve (309) has a bolt hole on the rear inner wall, which is threadedly connected to the T-shaped clamping bolt (310).

7. A pallet positioning device for a palletizer according to claim 3, characterized in that, A positioning hole is provided on the inner wall of the right side of the first through hole (102), and the inner wall of the positioning hole is in contact with the outer side of the first positioning rod (307).

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