A prefabricated board conveying and stacking equipment

Abstract

The present invention relates to the technical field of conveying and palletizing machines, and specifically discloses a prefabricated board conveying and palletizing equipment, comprising a feed conveyor and a conveying track frame, wherein a layer-by-layer placing device for receiving prefabricated boards one by one and placing them up and down layer by layer is movably arranged between the feed conveyor and the conveying track frame, a material grabbing and palletizing device is arranged on the conveying track frame, a driving device for realizing the movement of the material grabbing and palletizing device along a guide track on the conveying track frame is arranged on the conveying track frame, and a fork plate seat is arranged directly below the conveying track frame away from the side of the layer-by-layer placing device; the prefabricated board conveying and palletizing equipment disclosed in the present invention can clamp and convey multiple prefabricated boards at one time, and then unload and palletize them. Compared with the prior art, the whole equipment has higher efficiency in conveying and palletizing prefabricated boards, and at the same time, it also effectively realizes the automatic layered placement effect when multiple prefabricated boards are unloaded and synchronously palletized.

Description

Technical Field

[0001] The invention relates to the technical field of conveying and palletizing machines, and in particular discloses a prefabricated board conveying and palletizing device. Background Art

[0002] Precast panels are concrete products that are produced in factories through standardized, mechanized processing. In the actual production process of precast panels, concrete precast panels will be continuously produced by production equipment. After they are formed and demoulded, they need to be sent to the stacking equipment through a conveyor. Then, the clamping mechanism in the stacking equipment will stack the precast panels one by one on the fork plate. Then, the forklift will transport the fork plate and the precast panels stacked on top to the warehouse for placement, so as to save space and facilitate subsequent use.

[0003] The invention patent with application number 2021101226058 discloses a precast concrete part flipping bidirectional conveying system, including a support frame, a clamp assembly, a stacking support seat, a flip assembly, and a conveying roller assembly; two walking tracks are arranged on the top of the support frame; the clamp assembly is arranged on the support frame and can move along the walking tracks, and a liftable clamp assembly is arranged at the bottom of the clamp assembly; the flip assembly includes a vertically connected flip plate and a flip conveying roller assembly. When the precast concrete part flipping bidirectional conveying system disclosed in the invention is used to clamp one precast board at a time during the conveying and stacking of precast panels, and then moves along the walking track through the walking wheels. When the clamp assembly moves to the top of the stacking support seat or the fork plate, it is lowered to the top of the stacking support seat for unloading and stacking, which effectively realizes the conveying and stacking functions of the precast concrete parts. However, the concrete precast part flipping bidirectional conveying system can only grab one precast board at a time, and after the precast board is grabbed, it needs to be conveyed, discharged and stacked. Finally, after the discharge is completed, the clamp assembly needs to be moved back to the pending workstation. The time for the above-mentioned whole process of grabbing, conveying, discharging and stacking is relatively long, and the fact that only one precast board can be operated at a time greatly limits the conveying and stacking speed of the precast boards. In addition, during the stacking process of the precast boards, two wooden strips need to be manually placed between the upper and lower layers of the precast boards, so that the upper and lower layers of the stacked precast boards are separated, thereby facilitating the subsequent lifting and use one by one. However, the existing equipment cannot put the wooden strips between the upper and lower layers of the precast boards when stacking multiple precast boards at one time. Therefore, in view of the above-mentioned shortcomings of the existing concrete precast part flipping bidirectional conveying system, the present application proposes a device that can realize the conveying and stacking of multiple precast boards at the same time, and can place the wooden strips between the upper and lower layers of the precast boards during the process of discharging and stacking multiple precast boards. Summary of the invention

[0004] The present invention aims to provide a device that can simultaneously realize the conveying and stacking of multiple prefabricated boards, and can place wooden strips between the upper and lower layers of prefabricated boards during the process of unloading and stacking of multiple prefabricated boards, so as to solve the problems of low efficiency in the prior art of conveying and stacking prefabricated boards and inability to place wooden strips between the stacked prefabricated boards to realize the upper and lower stratification of prefabricated boards.

[0005] The present invention is achieved through the following technical solutions:

[0006] A prefabricated board conveying and stacking equipment, comprising a feed conveyor and a conveying track frame, a layer-by-layer placing device for receiving prefabricated boards one by one and placing them layer by layer up and down is movably arranged between the feed conveyor and the conveying track frame, a material grabbing and stacking device is arranged on the conveying track frame, a driving device for realizing the movement of the material grabbing and stacking device along the guide track on the conveying track frame is arranged on the conveying track frame, and a fork plate seat is arranged directly below the conveying track frame on the side away from the layer-by-layer placing device;

[0007] Among them, the material grabbing and stacking device includes a top plate and two clamping side frames, the two clamping side frames are respectively arranged on both sides of the lower end of the top plate, and the clamping side frames are provided with a power component to realize the two clamping side frames to move toward or away from each other, and multiple side end clamping strips are arranged on the opposite sides of the two clamping side frames. The multiple side end clamping strips are arranged at intervals up and down and clamp the prefabricated panels placed layer by layer on the layer-by-layer placement device when the two clamping side frames move toward each other.

[0008] As a further arrangement of the above scheme, the two side ends of the top plate are downwardly connected with side plates, and a plurality of wooden strip placement plates are arranged at intervals on the opposite sides of the two side plates, and each wooden strip placement plate is located below the corresponding side end clamping strip, and a piston cylinder and a top material cylinder are fixed on the side plates between the two adjacent wooden strip placement plates, and a connecting pipe is arranged between the outer ends of the piston cylinder and the top material cylinder, and a first piston and a second piston are respectively arranged in the piston cylinder and the top material cylinder, and hydraulic oil is filled in the enclosed space between the first piston, the second piston and the connecting pipe, and the first piston is connected to a pressure rod acting on the clamping side frame, and the second piston is connected to a push plate acting on the wooden strip through the push rod, and a spring is arranged in the top material cylinder to realize the movement and reset of the second piston.

[0009] As a further configuration of the above scheme, the layer-by-layer placement device includes a mobile base and a pushing device for realizing directional movement of the mobile base, a vertical plate is fixed on the mobile base, a lifting vertical plate is slidably arranged on the vertical plate, and a hydraulic telescopic cylinder for pushing the lifting vertical plate to move up and down is arranged on the mobile base, and a plurality of pallets for receiving prefabricated panels are arranged at intervals on the upper and lower sides of the lifting vertical plate.

[0010] As a further configuration of the above solution, a vertical slide rail is arranged on the lifting vertical plate, and a slide bar block matching the vertical slide rail is arranged on the lifting vertical plate.

[0011] As a further configuration of the above scheme, the conveying track frame includes a track plate and a support frame, the two support frames are respectively connected to the two ends of the track plate, and the upper surface of the track plate is provided with a guide track matching the material grabbing and stacking device.

[0012] As a further configuration of the above scheme, the track plate is composed of two horizontal sections and a middle inclined section, and the horizontal section located at the layer-by-layer placement device is higher than the horizontal section at the fork plate seat position.

[0013] As a further configuration of the above solution, a connecting plate is fixed on the top plate, and a guide roller that moves along the guide track is provided on the connecting plate.

[0014] As a further configuration of the above scheme, the power assembly includes a bidirectional screw and a power device for driving the bidirectional screw to rotate, and the upper ends of the two clamping side frames are connected to nut blocks threadedly connected to the bidirectional screw.

[0015] As a further configuration of the above scheme, a sliding rod parallel to the bidirectional screw rod is further provided at the lower end of the top plate, and a sliding hole block matching the sliding rod is connected to the upper ends of the two clamping side frames.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The prefabricated board conveying and stacking equipment disclosed in the present invention receives the prefabricated boards delivered by the feed conveyor one by one and realizes upper and lower layered placement through the layer-by-layer placement device. After the layer-by-layer placement device is filled with prefabricated boards, the layer-by-layer placement device is moved to the bottom of the conveying track frame, and then the material grabbing and stacking device is moved to the layer-by-layer placement device. The material grabbing and stacking device is then started to clamp all the layered prefabricated boards, and then moved to the top of the fork plate seat after clamping for unloading and stacking. The prefabricated board conveying and stacking equipment can clamp and convey multiple prefabricated boards at one time, and then unload and stack them. Compared with the prior art, the whole equipment has higher efficiency in conveying and stacking prefabricated boards.

[0018] 2) The present invention further improves the design for placing wooden strips to achieve upper and lower stratification when stacking prefabricated boards. The structural improvement of the material grabbing and stacking device enables the operator to place wooden strips on each wooden strip placement board in advance before unloading and stacking the prefabricated boards, avoiding the safety hazard caused by the operator manually placing the wooden strips on the prefabricated boards; then, in the process of unloading and stacking by the material grabbing and stacking device, the hydraulic oil between the piston cylinder, the ejector cylinder and the connecting pipe is used to enable the wooden strips to be pushed between the upper and lower prefabricated boards through the pushing plate while the two clamping side frames move away from each other to unload. When the prefabricated boards slip and fall, the wooden strips are also pushed between the two prefabricated boards to fall synchronously, so that after the prefabricated boards are placed on the fork plate seat, the wooden strips can separate multiple prefabricated boards into upper and lower layers, which is convenient for subsequent use of the prefabricated boards; the structural design of the entire material grabbing and stacking device is novel, and effectively realizes the automatic layering and placement function when multiple prefabricated boards are unloaded and stacked synchronously. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0021] Figure 2 It is a schematic diagram of the top plan structure of the present invention;

[0022] Figure 3 It is a schematic diagram of the three-dimensional structure of the layer-by-layer placement device in the present invention from a first angle;

[0023] Figure 4 It is a schematic diagram of the three-dimensional structure of the layer-by-layer arrangement device in the present invention from a second angle;

[0024] Figure 5 It is a schematic diagram of the three-dimensional structure of the material grabbing and stacking device in Example 1 of the present invention;

[0025] Figure 6 It is a schematic diagram of the three-dimensional structure of the clamping side frame, the sliding hole block, the nut block, etc. in the present invention;

[0026] Figure 7 It is a schematic diagram of the three-dimensional structure of the material grabbing and stacking device in Example 2 of the present invention;

[0027] Figure 8 This is a schematic diagram of the planar structure of the material grabbing and stacking device after grabbing materials in Example 2 of the present invention;

[0028] Fig. 9It is a schematic diagram of the internal planar structure of the piston cylinder, ejector cylinder, connecting pipe, etc. in the present invention. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0030] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. Figures 1 to 9 , and describes the application in detail with reference to embodiments. Example 1

[0031] Embodiment 1 discloses a prefabricated board conveying and stacking device, Figure 1 and attached Figure 2 The main body of the equipment includes a feed conveyor 1, a layer-by-layer placing device 2, a conveying track frame 3 and a grabbing and stacking device 4. The layer-by-layer placing device 2 is arranged at one end of the feed conveyor 1 to receive the prefabricated panels conveyed. The grabbing and stacking device 4 is movably arranged on the conveying track frame 3 and grabs a plurality of prefabricated panels spaced up and down on the layer-by-layer placing device 2 at the same time, and then moves to the top of the fork plate seat 6 for placing and stacking.

[0032] Reference Figure 3 and attached Figure 4 The layer-by-layer placement device 2 includes a mobile base 201, two rows of rollers 202 are arranged on the lower surface of the mobile base 201, and the rollers 202 are matched with two roller tracks 203 on the ground, and then a pushing device 204 is arranged on one side of the mobile base 201. The pushing device 204 can be a cylinder or a hydraulic cylinder. The distance between the mobile base 201 and the discharge end of the feed conveyor 1 can be adjusted by extending or shortening the pushing device 204.

[0033] A vertical plate 205 is welded to one end of the upper surface of the mobile base 201, and a vertical strip opening 2051 is opened on the vertical plate 205. Vertical slide rails 206 are welded to the vertical plate 205 on both sides of the strip opening 2051. A slide block 207 is slidably set on each vertical slide rail 206, and then a lifting vertical plate 208 is welded between the two slide blocks 207. A convex plate 209 passing through the strip opening 2051 is connected to the lifting vertical plate 208, and then a hydraulic telescopic cylinder 210 connected to the convex plate 209 is installed on the mobile base 201. Through the action of the hydraulic telescopic cylinder 210, the lifting vertical plate 208 can be moved up and down along the vertical slide rail 206. A plurality of supporting plates 211 are fixedly set on the lifting vertical plate 208, and the plurality of supporting plates 211 are evenly spaced up and down, and the spacing between two adjacent supporting plates 211 is set within 2 times the thickness of the prefabricated plate to prevent the prefabricated plate from being damaged due to a large falling height during the discharge process. In addition, in order to reduce the wear and scratches caused by the precast plate when it moves to the upper surface of the pallet 211, a row of rollers 212 are rotatably connected to the pallet 211, thereby changing the sliding friction between the precast plate and the pallet 211 into rolling friction.

[0034] Reference Figure 1 , Attachment Figure 5 and attached Figure 6 The conveying track frame 3 includes support frames 301 at both ends, and a track plate 302 is connected between the tops of the two support frames 301. The track plate 302 is composed of two horizontal sections and a middle inclined section, so that the track plate 302 located at the layer-by-layer placement device 2 is higher to facilitate material grabbing, and the track plate 302 at the other end is lower to reduce the distance the prefabricated board falls when placing the material. Then two parallel guide rails 303 are arranged on the upper surface of the track plate 302.

[0035] The material grabbing and stacking device 4 includes a U-shaped top plate 401, on the upper surface of which two L-shaped connecting plates 402 are welded, and each connecting plate 402 is provided with a guide roller 403 matching the corresponding guide track 303. In addition, the track plate 302 is also provided with a driving device (not shown in the figure) for realizing the movement of the top plate 401 along the guide track 303. The specific driving device can adopt a chain transmission system, connecting the top plate 401 with a chain, and then realizing the movement of the chain through the transmission action of the motor and the sprocket, thereby driving the top plate 401 to move along the guide track 303 in a directional manner.

[0036] A sliding rod 404 and a bidirectional screw rod 405 are arranged parallel to each other at the lower end of the top plate 401. The spiral directions of the external threads at both ends of the bidirectional screw rod 405 are arranged in opposite directions, and a power device 406 is connected to one end of the bidirectional screw rod 405. The specific power device includes a driving motor, a driving wheel and a driven wheel. The driving motor is fixedly arranged on the upper surface of the top plate 401 and the driving wheel is connected to the motor shaft. The driven wheel is connected to the outer end of the bidirectional screw rod 405, and a transmission member is arranged between the driving wheel and the driven wheel. The transmission member can be a chain or a V-belt.

[0037] Clamping side frames 407 are provided on both sides below the slide bar 404 and the bidirectional screw rod 405. A sliding hole block 408 and a nut block 409 are welded to the upper end of each clamping side frame 407. The sliding hole block 408 is passed through the slide bar 404, and the nut block 409 is threadedly connected to the corresponding external thread on the bidirectional screw rod 405. A plurality of C-shaped side end clamping strips 410 are fixedly connected to the opposite sides of the two clamping side frames 407. The plurality of side end clamping strips 410 are also arranged on the clamping side frames 407 at equal intervals, and the spacing between two adjacent side end clamping strips 410 is equal to the spacing between two adjacent support plates 211 on the layer-by-layer placement device 2.

[0038] During the operation of the prefabricated panel conveying and stacking equipment disclosed in this embodiment, the pushing device 204 pushes the entire layer-by-layer placement device 2 to the discharge end of the feed conveyor 1 to connect them, and then each time a prefabricated panel is delivered to the upper surface of the pallet 211, the hydraulic telescopic cylinder 210 pushes it upward for a distance, so that an empty pallet 211 below is used to receive the next prefabricated panel.

[0039] After all the pallets 211 on the pushing device 204 are loaded with a prefabricated board, the pushing device 204 is started again to push the fully loaded layer-by-layer placement device 2 to the right below the track plate 302. Then the driving device on the track plate 302 is started to move the material grabbing and stacking device 4 to the position of the layer-by-layer placement device 2. At this time, the two clamping side frames 407 are respectively located on the left and right sides of the material grabbing and stacking device 4, and each side end clamping bar 410 on the clamping side frame 407 is aligned with the corresponding side end of the prefabricated board. The power device 406 is started again to rotate the bidirectional screw rod 405, and then the two ends of the bidirectional screw rod 405 and the nut block 409 are used to make the two clamping side frames 407 move closer to each other, so that each prefabricated board is clamped and grabbed by the side end clamping bars 410 on both sides.

[0040] After the grabbing and stacking device 4 completely grabs the prefabricated board, the driving device on the track plate 302 is started in reverse to move the grabbing and stacking device 4 toward the fork plate seat 6. After the grabbing and stacking device 4 is moved away, the layer-by-layer placing device 2 will be reset and receive the prefabricated board delivered by the feed conveyor 1 again.

[0041] Finally, when the material grabbing and stacking device 4 moves to the top of the fork plate seat 6, the power device 406 is started to make the two clamping side frames 407 move away from each other, so that the multiple prefabricated panels grabbed are placed together on the upper surface of the fork plate seat 6, and then the stacked prefabricated panels can be transported away together with the fork plate seat 6 by a forklift. Example 2

[0042] Example 2 discloses a prefabricated board conveying and stacking equipment that is improved on the basis of Example 1, which mainly improves the material grabbing and stacking device 4 so that when the prefabricated boards are stacked, wooden strips 600 can be automatically placed between two adjacent prefabricated boards on the upper and lower layers, thereby realizing upper and lower layering of the prefabricated boards after stacking, which is convenient for subsequent retrieval.

[0043] The similarities between Example 2 and Example 1 are not described again. Figure 7 , Attachment Figure 8 and attached Fig. 9 , side panels 411 extend downwardly from both ends of the top panel 401, and a plurality of horizontally arranged wood strip placement panels 412 are welded on opposite sides of the two side panels 411. The plurality of wood strip placement panels 412 are evenly spaced up and down, and are all arranged at positions below the corresponding side end clamping strips 410.

[0044] A piston cylinder 413 and a push-up cylinder 414 are fixedly mounted on the side plate 411 between two adjacent wood strip placement plates 412. In the figure, two piston cylinders 413 and push-up cylinders 414 are provided at corresponding positions, and are distributed front and back on the side plate 411. A connecting pipe 415 is provided between the outer ends of the piston cylinder 413 and the push-up cylinder 414. A first piston 416 is provided inside the piston cylinder 413, and a pressing rod 417 is connected to the first piston 416 to abut against the clamping side frame 407. A second piston 418 is provided in the push-up cylinder 414, and hydraulic oil is filled in the closed space between the second piston 418, the first piston 416 and the connecting pipe 415. A spring 419 is provided between the second piston 418 and the open end of the ejector barrel 414. A ejector rod 420 is connected to the second piston 418, and a ejector plate 421 is provided at the outer end of the ejector rod 420 to push the wood strips toward the center of the grabbing and stacking device 4. Finally, in order to prevent the wood strips 600 from being blocked by the clamping side frame 407 when being pushed toward the center of the grabbing and stacking device 4, a notch 4071 is provided at the position corresponding to the clamping side frame 407, so that the pushing of the wood strips 600 will not be affected.

[0045] Before the grabbing and stacking device 4 disclosed in the present embodiment 2 grabs a plurality of prefabricated boards and moves to the top of the fork plate seat 6 for unloading, the operator places a wooden strip 600 on each wooden strip placement plate 412 to avoid the safety hazard caused by the operator placing wooden strips on the upper surface of the prefabricated board. Then the power device 406 is started to make the clamping side frames 407 move away from each other to unload the materials. During the movement of the clamping side frames 407, it will act on the outer end of the pressure rod 417, so that the first piston 416 moves outward along the piston cylinder 413. At this time, under the action of the hydraulic oil, the second piston 418 will move in the opposite direction along the ejection cylinder 414, and then the wooden strips 600 on the wooden strip placement plate 412 will be pushed between the upper and lower layers of prefabricated boards through the clamping side frames 407 through the action of the ejection rod 420 and the push plate 421. When the prefabricated boards are put down from the material grabbing and stacking device 4, the wooden strips 600 on both sides are pushed down and positioned between the upper and lower layers of prefabricated boards, so that the prefabricated boards stacked on the fork plate seat 6 are separated by two wooden strips 600, which is convenient for subsequent use.

[0046] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A prefabricated board conveying and stacking equipment, comprising a feed conveyor and a conveying track frame, characterized in that: A layer-by-layer placement device is movably arranged between the feed conveyor and the conveying track frame for receiving the prefabricated panels one by one and placing them layer by layer up and down; a material grabbing and stacking device is arranged on the conveying track frame; a driving device is arranged on the conveying track frame to realize the movement of the material grabbing and stacking device along the guide track on the conveying track frame; a fork plate seat is arranged directly below the conveying track frame on the side away from the layer-by-layer placement device; The material grabbing and stacking device comprises a top plate and two clamping side frames, the two clamping side frames are respectively arranged on both sides of the lower end of the top plate, and the clamping side frames are provided with power components for realizing the movement of the two clamping side frames toward or away from each other, and the two clamping side frames are provided with a plurality of side end clamping strips on the opposite sides thereof, and the plurality of side end clamping strips are arranged at intervals up and down and clamp the prefabricated panels placed layer by layer on the layer-by-layer placing device when the two clamping side frames move toward each other; The two side ends of the top plate are downwardly connected to side plates, and a plurality of wooden strip placement plates are arranged at intervals on the opposite sides of the two side plates, and each wooden strip placement plate is located below the corresponding side end clamping strip, and a piston cylinder and a top material cylinder are fixed to the side plates between the two adjacent wooden strip placement plates, and a connecting pipe is arranged between the outer ends of the piston cylinder and the top material cylinder, and a first piston and a second piston are respectively arranged in the piston cylinder and the top material cylinder, and hydraulic oil is filled in the enclosed space between the first piston, the second piston and the connecting pipe, and the first piston is connected to a pressure rod acting on the clamping side frame, and the second piston is connected to a push plate acting on the wooden strip through the top material rod, and a spring is arranged in the top material cylinder to realize the movement and reset of the second piston.

2. The prefabricated board conveying and stacking equipment according to claim 1 is characterized in that: The layer-by-layer placement device includes a mobile base and a pushing device for realizing directional movement of the mobile base, a vertical plate is fixed on the mobile base, a lifting vertical plate is slidably arranged on the vertical plate, and a hydraulic telescopic cylinder for pushing the lifting vertical plate to move up and down is arranged on the mobile base, and a plurality of pallets for receiving prefabricated panels are arranged at intervals on the upper and lower sides of the lifting vertical plate.

3. The prefabricated board conveying and stacking equipment according to claim 2 is characterized in that: The lifting vertical plate is provided with a vertical slide rail, and the lifting vertical plate is provided with a slide bar block matching the vertical slide rail.

4. The prefabricated board conveying and stacking equipment according to claim 1, characterized in that: The conveying track frame comprises a track plate and a support frame, wherein the two support frames are respectively connected to two ends of the track plate, and the upper surface of the track plate is provided with a guide track matching the material grabbing and stacking device.

5. The prefabricated board conveying and stacking equipment according to claim 4, characterized in that: The track plate is composed of two horizontal sections and a middle inclined section, and the horizontal section located at the layer-by-layer placement device is arranged higher than the horizontal section at the fork plate seat position.

6. The prefabricated board conveying and stacking equipment according to claim 4 or 5, characterized in that: A connecting plate is fixed on the top plate, and a guide roller moving along a guide track is arranged on the connecting plate.

7. The prefabricated board conveying and stacking equipment according to claim 1, characterized in that: The power assembly comprises a bidirectional screw and a power device for driving the bidirectional screw to rotate, and the upper ends of the two clamping side frames are both connected with nut blocks threadedly connected to the bidirectional screw.

8. The prefabricated board conveying and stacking equipment according to claim 7, characterized in that: The lower end of the top plate is also provided with a sliding rod parallel to the bidirectional screw rod, and the upper ends of the two clamping side frames are both connected with sliding hole blocks matching the sliding rod.

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