An up-and-down feeding device for refrigerator main body door foaming production

Abstract

The application discloses a feeding and discharging device for refrigerator main body door foaming production, which comprises a feeding conveyor belt, the surface of the feeding conveyor belt is connected with symmetrically arranged racks, the racks are close to the side of the feeding conveyor belt, a hollow disc is arranged above each of the two racks, an external gear is fixedly connected to the outer side of the hollow disc, the external gear is engaged with the rack, a plurality of uniformly arranged teeth are arranged on the inner side wall of the hollow disc, a notched gear is fixedly connected to the central position in the hollow disc, the notch of the notched gear corresponds to the teeth, a plane gear is arranged above the inside of the hollow disc, and the plane gear is intermittently engaged with the teeth and the notched gear; after the cooperation of the adjusting roller and the push rod, the door body is corrected to the position corresponding to the suction cup, and after the suction cup adsorbs the door body, the door body can be just pasted and placed into the foaming mold, when the position of the door body is corrected, the feeding conveyor belt does not need to be stopped, the operation steps are reduced, and the efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the field of refrigerator manufacturing technology, specifically relating to a loading and unloading device for the foaming production of refrigerator main doors. Background Technology

[0002] A refrigerator is a household appliance used to refrigerate and preserve food and beverages. During the production of refrigerators, the main body of the refrigerator door is foamed. The purpose of this process is to increase the insulation performance of the refrigerator, reduce the conduction of internal and external temperatures, maintain a low-temperature environment inside the refrigerator, save energy, and extend the refrigeration time. At the same time, foaming the door can also improve the strength and stability of the refrigerator door and prevent the door from deforming or being damaged.

[0003] A search revealed two videos: https: / / v.douyin.com / i2TNrEKJ / and https: / / v.douyin.com / i2TNhHXR / . Both videos demonstrate that suction cups are used for loading and unloading the refrigerator door during the foaming process. The suction cups provide strong adhesion, preventing the door from sliding or falling. However, the production line needs to be stopped or slowed down during the process of removing the door from the conveyor belt and placing it into the foaming mold, as well as when removing the foamed door from the mold. Furthermore, the production line needs to be stopped again when correcting the door's position. Frequent stopping and slowing down reduces work efficiency and production capacity. It also increases the risk of machine damage and maintenance costs. Summary of the Invention

[0004] One of the objectives of this invention is to solve the problem of having to stop the production line when correcting the position of the door body; The second objective of this invention is to solve the problem of having to stop the production line when loading and unloading door components.

[0005] The objective of this invention can be achieved through the following technical solutions: A loading and unloading device for producing a refrigerator door body using foaming technology includes a loading conveyor belt. Symmetrically arranged racks are connected to the surface of the loading conveyor belt, with the racks close to the sides of the belt. A hollow disc is positioned above each rack. An external gear is fixed to the outer side of the hollow disc and meshes with the racks. Multiple evenly arranged teeth are arranged on the inner wall of the hollow disc. A notched gear is fixed to the center of the hollow disc, with the notch corresponding to the teeth. A planar gear is positioned above the interior of the hollow disc, intermittently meshing with the teeth and the notched gear. A bidirectional lead screw connects the two planar gears. A symmetrically arranged movable plate is threaded to the outer side of the bidirectional lead screw. Multiple evenly arranged push rods are rotatably connected below the movable plate, and the push rods are located between two sets of chains. Preferably, two hollow discs are respectively provided with fixed plates on their outer sides, and the fixed plates are fixed to the conveyor frame of the feeding conveyor belt. The central disc is rotatably connected to the fixed plate. A T-shaped plate is connected between the two central discs. The middle part of the bidirectional screw is rotatably connected to the inside of the T-shaped plate. Positioning rods are symmetrically arranged between the two central discs corresponding to the two ends of the moving plate. The moving plate is slidably connected to the outside of the positioning rods.

[0006] Preferably, rotating rods are rotatably connected to the two fixed plates, and swing arms are respectively connected to the ends of the two rotating rods that are close to each other. A torsion spring is connected between the fixed plates and the swing arms, and the torsion spring is located outside the rotating rods. An adjusting roller is rotatably connected between the two swing arms below.

[0007] Preferably, a plurality of evenly arranged abutments are provided in the middle of the surface of the feeding conveyor belt.

[0008] Preferably, the internal diameter of the hollow disk is equal to the distance between the same side of two adjacent blocks.

[0009] Preferably, a mounting base is provided on one side of the feeding conveyor belt, a first motor is provided above the mounting base, a drive wheel is connected to the output end of the first motor, the lower surface of the drive wheel is rotatably connected to the mounting base, a chain is engaged on the outer side of the drive wheel, a driven wheel is engaged on the inner side of the other end of the chain, the lower surface of the driven wheel is rotatably connected to the mounting base, and a plurality of evenly arranged connecting seats are connected to the upper surface of the chain, and a foaming mold is installed on the upper surface of the connecting seats.

[0010] Preferably, a second motor is provided below the connecting seat, and a drive wheel is connected to the output end of the second motor. An auxiliary wheel is engaged with the outer side of the drive wheel. A support column is connected to the middle of the upper surface of the auxiliary wheel. A positioning seat is connected to the connecting seat at the position corresponding to the support column. The support column is rotatably connected in the positioning seat. A top plate is connected to the upper end of the support column. A cylinder is installed on the lower surface of the top plate away from the support column. An auxiliary plate is connected to the output end below the cylinder. Multiple evenly arranged suction cups are provided on the lower surface of the auxiliary plate. The feeding conveyor belt corresponds to the suction cups.

[0011] Preferably, the rotation speed of the chain is the same as the rotation speed of the feeding conveyor belt.

[0012] Preferably, the distance between the same side of two adjacent abutments is equal to the distance between the same ends of two auxiliary plates.

[0013] Preferably, a discharge conveyor belt is provided on the side of the mounting base away from the feeding conveyor belt, and the discharge conveyor belt corresponds to the suction cup.

[0014] The beneficial effects of this invention are: When the door body is conveyed to the position of the push rod, the engagement of the toothed gear and the planar gear drives the bidirectional lead screw to rotate. The rotation of the bidirectional lead screw causes two moving plates to move and approach each other on the outer thread of the bidirectional lead screw. At the same time, the two moving plates move and bring the two sets of push rods closer together. The two sets of push rods pushing the door body pushes it between the two sets of push rods, placing the door body in the center of the feeding conveyor belt. After the position of the door body is corrected, the engagement of the notched gear and the planar gear drives the bidirectional lead screw to reverse, thereby causing the two moving plates to move and move away from each other on the outer thread of the bidirectional lead screw, thus resetting the two moving plates and preparing for the position correction of the next door body.

[0015] When the door body is conveyed to a position close to the adjusting roller, the door body contacts the adjusting roller and pushes the adjusting roller and the swing arm, causing the adjusting roller and the swing arm to rotate upward around the rotating rod. During rotation, the torsion spring twists, generating a torsional force. Since forces are reciprocal, after the door body pushes the adjusting roller and generates a torsional force in the torsion spring, the torsion spring will give the adjusting roller and the swing arm a reaction force. This reaction force is then transmitted to the door body through the adjusting roller and the swing arm. Thus, with the cooperation of the abutment block, the adjusting roller can push the door body to a position where it is pressed against the abutment block. After the adjusting roller and the push rod cooperate, the door body is corrected to the position corresponding to the suction cup. After the suction cup adsorbs the door body, it can also be placed into the foaming mold. When correcting the position of the door body, it is not necessary to stop the conveyor belt, reducing operation steps and improving efficiency.

[0016] This invention sets the rotation speed of the chain to be the same as that of the feeding conveyor belt. When the feeding conveyor belt transports the door to the position corresponding to the suction cup, the door and the suction cup will be in a relatively stationary state. At this time, the suction cup can be used to put the door into the foaming mold. This is the same as stopping the conveyor belt and then using the suction cup to pick up the door. However, it does not require stopping the feeding conveyor belt, which reduces the operation time and thus improves efficiency.

[0017] This invention sets the distance between the same side of two adjacent abutments and the distance between the same end of two auxiliary plates to be the same. When the connecting seat rotates from the corner of the chain and is parallel to the feeding conveyor belt, the suction cup will be exactly aligned with the door body, thus facilitating the suction of the door body into the foaming mold.

[0018] This invention sets the internal diameter of the hollow disc to be the same as the distance between the two adjacent abutments on the same side. When the door body is conveyed between the two sets of push rods, the teeth will just mesh with the planar gear, thereby correcting the position of the door body. After the position of the door body is corrected, the notched gear will also just mesh with the planar gear, thereby resetting the two moving plates. Attached Figure Description

[0019] The invention will now be further described with reference to the accompanying drawings.

[0020] Figure 1 This is a perspective view of the present invention; Figure 2 This is a perspective view of the chain section of the present invention; Figure 3 This is a perspective view of the suction cup in this invention; Figure 4 This is an exploded view of the fixing plate in this invention; Figure 5 This is a diagram showing the positional relationship between the rack and the hollow disk in this invention; Figure 6 This is a diagram showing the positional relationship between the feeding conveyor belt and the push rod in this invention.

[0021] In the diagram: 1. Mounting base; 2. Connecting base; 3. Second motor; 4. Feeding conveyor belt; 5. Rack; 6. Fixing plate; 7. Rotating rod; 8. Unloading conveyor belt; 11. Positioning stake; 12. First motor; 13. Drive wheel; 14. Chain; 15. Driven wheel; 21. Casters; 22. Foaming mold; 31. Motor mount; 32. Drive wheel; 33. Auxiliary wheel; 34. Support column; 35. Positioning seat; 36. Top plate; 37. Cylinder; 38. Auxiliary plate; 39. Suction cup; 41. Third motor; 42. Abutment block; 51. Hollow disc; 52. External gear; 53. Gear teeth; 54. Notched gear; 55. Planar gear; 56. Double-acting lead screw; 57. Moving plate; 58. Push rod; 59. Positioning rod; 61. T-shaped plate; 71. Swing arm; 72. Torsion spring; 73. Adjusting roller; 81. The fourth motor. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0023] Please see Figure 1 - Figure 6 As shown, a loading and unloading device for the foaming production of refrigerator main door includes a mounting base 1, and a first motor 12 is provided above the mounting base 1 for driving the drive wheel 13 to rotate. A positioning stake 11 is provided on the upper surface of the mounting base 1 at the position corresponding to the first motor 12. The first motor 12 is mounted on the positioning stake 11 by a screw. The positioning stake 11 is used to install and fix the first motor 12. The output end of the first motor 12 is connected to the drive wheel 13. The middle part of the lower surface of the drive wheel 13 is rotatably connected to the mounting base 1. The outer side of the drive wheel 13 is engaged with a chain 14, which is used to drive the connecting base 2 to move. The other end of the chain 14 is engaged with a driven wheel 15. The lower surface of the driven wheel 15 is rotatably connected to the mounting base 1. The driven wheel 15 cooperates with the driving wheel 13 to enable the chain 14 to rotate stably. The upper surface of the chain 14 is connected to a plurality of evenly arranged connecting seats 2, and the lower surface of the connecting seats 2 is equipped with four universal wheels 21 for supporting the connecting seats 2 and assisting the connecting seats 2 in moving. A foaming mold 22 is installed on the upper surface of the connecting seat 2 for foaming the main body of the refrigerator door; A second motor 3 is provided below the connecting seat 2 to drive the drive wheel 32 to rotate, and the drive wheel 32 rotates 180° each time. An L-shaped motor mount 31 is connected below the connecting base 2 at the position corresponding to the second motor 3, for installing and fixing the second motor 3; The output end of the second motor 3 is connected to a drive wheel 32. An auxiliary wheel 33 is engaged on the outer side of the drive wheel 32. A support column 34 is connected to the middle of the upper surface of the auxiliary wheel 33. The drive wheel 32 cooperates with the auxiliary wheel 33 to make the support column 34 rotate. The support column 34 is used to support the top plate 36. The connecting seat 2 is connected to the positioning seat 35 at the position corresponding to the support column 34. The support column 34 is rotatably connected in the positioning seat 35. The positioning seat 35 is used to support the support column 34 and fix the position of the support column 34. The upper end of the support column 34 is connected to the top plate 36. A cylinder 37 is installed on the lower surface of the top plate 36 away from the support column 34. An auxiliary plate 38 is connected to the lower output end of the cylinder 37. The cylinder 37 is used to drive the auxiliary plate 38 to rise or fall. The lower surface of the auxiliary plate 38 is provided with a plurality of evenly arranged suction cups 39 for adsorbing the door body, placing the door body into the foaming mold 22 or removing the foamed door body from the foaming mold 22. A feeding conveyor belt 4 is provided on one side of the mounting base 1. The feeding conveyor belt 4 corresponds to the suction cup 39. The feeding conveyor belt 4 is used to transport the door body to the position of the suction cup 39. The feeding conveyor belt 4 is set on the conveyor frame. One end of the conveyor frame has a drive shaft and the other end has a rotating shaft. The drive shaft is connected to the third motor 41 fixed to the outside of the conveyor frame. The third motor 41 cooperates with the drive shaft of the feeding conveyor belt 4 to make the feeding conveyor belt 4 rotate. It is worth noting here that the rotation speed of the chain 14 is the same as that of the feeding conveyor belt 4. When the feeding conveyor belt 4 transports the door to the position corresponding to the suction cup 39, the door and the suction cup 39 will be in a relatively stationary state. At this time, the suction cup 39 can be used to put the door into the foaming mold 22. This is the same as stopping the conveyor belt and then using the suction cup 39 to take out the door. However, it does not require stopping the feeding conveyor belt 4, which reduces the operation time and thus improves efficiency.

[0024] Multiple evenly arranged abutments 42 are provided in the middle of the surface of the feeding conveyor belt 4 for positioning the door body. At the same time, the conveyor belt can be divided into multiple areas, with one body placed in each area, which facilitates the picking up of the body body and the correction of the door body position to the specified position. The distance between the two adjacent abutment blocks 42 on the same side is equal to the distance between the two auxiliary plates 38 at the same end. With this setting, when the connecting seat 2 rotates from the corner of the chain 14 and is parallel to the feeding conveyor belt 4, the suction cup 39 will be exactly aligned with the door body, so as to facilitate the suction of the door body into the foaming mold 22. The surface of the feeding conveyor belt 4 is connected with symmetrically arranged racks 5, and the racks 5 are close to the side of the feeding conveyor belt 4. Hollow disks 51 are respectively arranged above the two racks 5 away from the suction cup 39. External gears 52 are fixed to the outside of the hollow disks 51. The external gears 52 mesh with the racks 5. The racks 5 drive the external gears 52 to rotate through the rotation of the feeding conveyor belt 4, thereby driving the hollow disks 51 to rotate. The inner wall of the hollow disk 51 is provided with a plurality of evenly arranged teeth 53. A notched gear 54 is fixedly connected to the center of the hollow disk 51, and the notch of the notched gear 54 corresponds to the teeth 53. A planar gear 55 is provided on the upper part of the interior of the hollow disk 51. The planar gear 55 intermittently meshes with the teeth 53 and the notched gear 54. In practical use, the rotation of the hollow disk 51 drives the tooth 53 and the notched gear 54 to rotate around the hollow disk 51. When the tooth 53 rotates to the position of the planar gear 55 and meshes with the planar gear 55, the tooth 53 will drive the planar gear 55 to rotate, and the rotation direction of the planar gear 55 is the same as the rotation direction of the central disk. When the notched gear 54 rotates to the position of the planar gear 55 and meshes with the planar gear 55, the notched gear 54 will drive the planar gear 55 to rotate, and the rotation direction of the planar gear 55 is opposite to the rotation direction of the central disk. Through the cooperation between the notched gear 54 and the tooth 53, the planar gear 55 can rotate in both directions.

[0025] A double-acting lead screw 56 is connected between two planar gears 55. A symmetrically arranged movable plate 57 is threaded to the outer side of the double-acting lead screw 56. Multiple evenly arranged push rods 58 are rotatably connected below the movable plate 57, and the push rods 58 are located between two sets of chains 14. In practical use, when the door body is conveyed to the position of push rod 58, the engagement of tooth 53 and planar gear 55 will drive the bidirectional lead screw 56 to rotate. The rotation of the bidirectional lead screw 56 will drive the two moving plates 57 to move and approach each other on the outer thread of the bidirectional lead screw 56. At the same time, the two moving plates 57 will drive the two sets of push rods 58 to approach each other. The two sets of push rods 58 will push the door body, pushing it between the two sets of push rods 58, and placing the body in the center of the feeding conveyor belt 4. After the position of the door body is corrected, the engagement of notched gear 54 and planar gear 55 will drive the bidirectional lead screw 56 to reverse, thereby driving the two moving plates 57 to move and move away from each other on the outer thread of the bidirectional lead screw 56, and then resetting the two moving plates 57 to prepare for the position correction of the next door body. It is worth noting here that the inner diameter of the hollow disc 51 is equal to the distance between the two adjacent abutments 42 on the same side. With this arrangement, when the door body is conveyed between the two sets of push rods 58, the teeth 53 will just mesh with the planar gear 55, thereby correcting the position of the door body. After the position of the door body is corrected, the notched gear 54 will also just mesh with the planar gear 55, thereby resetting the two moving plates 57.

[0026] Two hollow discs 51 are respectively provided with fixing plates 6 on their outer sides, and the fixing plates 6 are fixed to the conveyor frame of the feeding conveyor belt 4. The central disc is rotatably connected to the fixing plate 6. A T-shaped plate 61 is connected between the two central discs. The middle part of the bidirectional screw 56 is rotatably connected to the inside of the lower part of the T-shaped plate 61. The fixing plate 6 is used to install and fix the central disc and the T-shaped plate 61. The T-shaped plate 61 is used to support the bidirectional screw 56 and the planar gear 55, and at the same time fixes the position of the bidirectional screw 56 and the planar gear 55. Two central discs are provided with symmetrically arranged positioning rods 59 at both ends of the movable plate 57. The movable plate 57 is slidably connected to the outside of the positioning rods 59. The positioning rods 59 are used to limit the position of the movable plate 57 and prevent the movable plate 57 from deflecting. Two fixed plates 6 are rotatably connected to rotating rods 7 near the auxiliary plate 38. The ends of the two rotating rods 7 that are close to each other are respectively connected to swing arms 71. A torsion spring 72 is connected between the fixed plates 6 and the swing arms 71, and the torsion spring 72 is located outside the rotating rods 7. An adjusting roller 73 is rotatably connected between the two swing arms 71 below. In practical use, when the door body is conveyed to a position close to the adjusting roller 73, the door body will contact the adjusting roller 73 and push the adjusting roller 73 and the swing arm 71, causing the adjusting roller 73 and the swing arm 71 to rotate upwards around the rotating rod 7. During rotation, the torsion spring 72 will twist, generating a torsional force. Because forces are reciprocal, after the door body pushes the adjusting roller 73 and generates a torsional force in the torsion spring 72, the torsion spring 72 will give the adjusting roller 73 and the swing arm 71 a reaction force. This reaction force is then transmitted to the door body through the adjusting roller 73 and the swing arm 71. Thus, with the cooperation of the abutment block 42, the adjusting roller 73 can push the door body to a position where it is pressed against the abutment block 42. After the door body is pressed against the abutment block 42, the adjusting roller 73 can no longer push the door body. The adjusting roller 73 and the swing arm 71 will continue to rotate upward around the rotating rod 7. After the adjusting roller 73 rotates to the top of the door, the door will be conveyed past the adjusting roller 73 with the cooperation of the feeding conveyor belt 4 and the stop block 42. After the door passes the adjusting roller 73, the torsion spring 72 will reset under its own elastic force, thereby driving the swing arm 71 and the adjusting roller 73 to reset, and continue to correct the position of the door behind. With the cooperation of the adjusting roller 73 and the push rod 58, the door will be corrected to the position corresponding to the suction cup 39. After the suction cup 39 adsorbs the door, the door can be placed into the foaming mold 22. When correcting the position of the door, it is not necessary to stop the conveyor belt again, which reduces the operation steps and improves efficiency.

[0027] A discharge conveyor belt 8 is provided on the side of the mounting base 1 away from the feeding conveyor belt 4, and the discharge conveyor belt 8 corresponds to the suction cup 39. The discharge conveyor belt 8 is used to transport the foamed door body to the next stage. The feeding conveyor belt 8 is set on the conveyor frame. One end of the conveyor frame has a drive shaft and the other end has a rotating shaft. The drive shaft is connected to the fourth motor 81 fixed to the outside of the conveyor frame. The fourth motor 81 cooperates with the drive shaft of the feeding conveyor belt 8 to make the feeding conveyor belt 8 rotate. Working principle: During the operation of the feeding conveyor belt 4, chain 14, and unloading conveyor belt 8, the door body is placed on the upper surface of the feeding conveyor belt 4, positioning it between two adjacent abutment blocks 42, with the rear end of the door body abutting the front side of the abutment block 42. The feeding conveyor belt 4 will then transport the door body to the position of the push rod 58 and adjusting roller 73. With the cooperation of the push rod 58 and adjusting roller 73, the position of the door body will be corrected. When the connecting seat 2 rotates from the corner of the chain 14 to a position parallel to the feeding conveyor belt 4, the suction cup 39 will align with the door body. Under the control of the control system, the first step is to control the cylinder 37 to drive the auxiliary plate 38 and the suction cup 39 to descend, thus correcting the position of the door body. The door body is attracted by suction, and after attraction, the auxiliary plate 38 and suction cup 39 are driven to rise, thus lifting the door body. The second step controls the second motor 3 to drive the drive wheel 32 to rotate, so that with the cooperation of the auxiliary wheel 33 and the support column 34, the door body rotates 180° around the support column 34 as the center. After rotation, the door body aligns with the foaming mold 22. The third step controls the cylinder 37 to drive the auxiliary plate 38 and suction cup 39 to descend, placing the door body into the foaming mold 22. After placement, the auxiliary plate 38 and suction cup 39 are driven to rise. The fourth step controls the second motor 3 to drive the drive wheel 32 to rotate, and with the auxiliary wheel 33 and the support column 34, the auxiliary plate 38 and suction cup 39 rotate 180° again to reset. After the door body is added to the foaming mold 22 and the foaming agent is added, the foaming mold 22 will close under the control of the control system to carry out the foaming work. After the foaming is completed, the control system will control the foaming mold 22 to open. At this time, the foaming mold 22 will rotate to the position corresponding to the unloading conveyor belt 8. Then, with the cooperation of the suction cup 39, the foamed door body can be taken out from the foaming mold 22 and placed on the unloading conveyor belt 8 and conveyed to the next stage.

[0028] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0029] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A loading and unloading device for the foaming production of refrigerator main door body, characterized in that, The system includes a feeding conveyor belt (4), on which symmetrically arranged racks (5) are connected. The racks (5) are close to the sides of the feeding conveyor belt (4). Hollow disks (51) are respectively arranged above the two racks (5). External gears (52) are fixed to the outer side of the hollow disks (51) and mesh with the racks (5). Multiple evenly arranged teeth (53) are arranged on the inner sidewall of the hollow disks (51). A notched gear (54) is fixed to the center of the hollow disks (51). The notch of the wheel (54) corresponds to the tooth (53). A planar gear (55) is provided on the upper part of the hollow disk (51). The planar gear (55) meshes intermittently with the tooth (53) and the notched gear (54). A double-acting screw (56) is connected between the two planar gears (55). A symmetrically arranged movable plate (57) is threaded on the outer side of the double-acting screw (56). Multiple evenly arranged push rods (58) are rotatably connected below the movable plate (57), and the push rods (58) are located between the two sets of racks (5). Two hollow discs (51) are respectively provided with fixed plates (6) on their outer sides, and the fixed plates (6) are fixed to the conveyor frame of the feeding conveyor belt (4). The hollow discs are rotatably connected to the fixed plates (6). A T-shaped plate (61) is connected between the two hollow discs. The middle part of the bidirectional screw (56) is rotatably connected to the inside of the T-shaped plate (61). The two hollow discs are provided with symmetrically arranged positioning rods (59) at both ends of the moving plate (57). The moving plate (57) is slidably connected to the outside of the positioning rods (59).

2. The loading and unloading device for the foaming production of a refrigerator main door body according to claim 1, characterized in that, Rotating rods (7) are rotatably connected to the two fixed plates (6). The two rotating rods (7) are respectively connected to swing arms (71) at their close ends. A torsion spring (72) is connected between the fixed plate (6) and the swing arm (71), and the torsion spring (72) is located outside the rotating rod (7). An adjusting roller (73) is rotatably connected between the two swing arms (71) below.

3. The loading and unloading device for the foaming production of a refrigerator main door body according to claim 2, characterized in that, The feeding conveyor belt (4) has a number of evenly arranged abutments (42) in the middle of its surface.

4. The loading and unloading device for the foaming production of a refrigerator main door body according to claim 3, characterized in that, A mounting base (1) is provided on one side of the feeding conveyor belt (4). A first motor (12) is provided above the mounting base (1). A drive wheel (13) is connected to the output end of the first motor (12). The middle part of the lower surface of the drive wheel (13) is rotatably connected to the mounting base (1). A chain (14) is engaged on the outer side of the drive wheel (13). A driven wheel (15) is engaged on the inner side of the other end of the chain (14). The middle part of the lower surface of the driven wheel (15) is rotatably connected to the mounting base (1). A plurality of evenly arranged connecting seats (2) are connected to the upper surface of the chain (14). A foaming mold (22) is installed on the upper surface of the connecting seat (2).

5. The loading and unloading device for the foaming production of a refrigerator main door body according to claim 4, characterized in that, A second motor (3) is provided below the connecting seat (2). A drive wheel (32) is connected to the output end of the second motor (3). An auxiliary wheel (33) is engaged on the outer side of the drive wheel (32). A support column (34) is connected to the middle of the upper surface of the auxiliary wheel (33). A positioning seat (35) is connected to the connecting seat (2) at the position corresponding to the support column (34). The support column (34) is rotatably connected in the positioning seat (35). A top plate (36) is connected to the upper end of the support column (34). A cylinder (37) is installed on the lower surface of the top plate (36) away from the support column (34). An auxiliary plate (38) is connected to the output end below the cylinder (37). A plurality of evenly arranged suction cups (39) are provided on the lower surface of the auxiliary plate (38). The feeding conveyor belt (4) corresponds to the suction cups (39).

6. The loading and unloading device for the foaming production of a refrigerator main door body according to claim 5, characterized in that, The rotational speed of the chain (14) is the same as the rotational speed of the feeding conveyor belt (4).

7. The loading and unloading device for the foaming production of a refrigerator main door body according to claim 6, characterized in that, The distance between the same side of two adjacent blocks (42) is equal to the distance between the same end of two auxiliary plates (38).

8. The loading and unloading device for the foaming production of a refrigerator main door body according to claim 7, characterized in that, The mounting base (1) is provided with a discharge conveyor belt (8) on the side away from the feeding conveyor belt (4), and the discharge conveyor belt (8) corresponds to the suction cup (39).

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