A food tray conveyor

Abstract

The present invention discloses a food tray conveying device, which relates to the technical field of food processing, and comprises a carrying frame, wherein two conveying shafts are rotatably penetrated on the carrying frame, a servo motor is fixedly mounted on the outer wall of the carrying frame, the output end of the servo motor is fixedly connected to the conveying shaft on the left side, the two conveying shafts are linked by belts, a blocking rod is fixedly mounted on the inner wall of the carrying frame, a slide groove is provided on the inner wall of the carrying frame, wherein a receiving device comprises a slide plate, a tray body, a bottom plate, a lifting plate, a Z-shaped sheet and a rectangular block, the slide plate is slidably mounted on the slide groove, the tray body slides and penetrates the top of the slide plate, and after being lifted to a specified position by the tray body, the movement of the slide plate is stopped to prevent the belt from continuing to move and rubbing against the C-shaped groove, resulting in serious wear on the service life of the belt.

Description

Technical Field

[0001] The invention relates to the technical field of food processing, in particular to a food tray conveying device. Background Art

[0002] Pallet conveyors for food processing are usually used in food processing plants, catering industries, food sorting centers and other places to transport food pallets from one processing link to another, thereby improving production efficiency and processing quality.

[0003] The patent with patent announcement number CN217349356U relates to a tray conveying device for food processing, which relates to the field of food processing technology, including two conveying frames, each of which has conveying wheels hinged on the inner sides of the left and right ends of the conveying frames. The tray conveying device for food processing drives the conveying wheels and the conveyor belt to rotate through a servo motor to convey the tray body to the right. The bottom end of the tray body is stopped by the interference of the blocking frame and the rubber pad. At this time, the lifting plate is pushed up by the extension of the telescopic end of the electric push rod, and the four positioning blocks on the lifting plate will enter the four positioning grooves at the bottom of the tray body. After putting the pastries in, the electric push rod is reset to drive the lifting plate to descend and reset, and the tray body is re-mounted between the conveyor belts. The second telescopic end of the electric push rod is retracted to pull the blocking frame and the rubber pad to descend. The tray body containing the pastries is conveyed to the right through the operation of the servo motor, thereby improving the conveying and tray lifting effects of the device.

[0004] In the above patent, there is a function that facilitates users to place and take cakes. The lifting plate is pushed up by the extension of one telescopic end of the electric push rod, so that the tray body is moved to a specified position and then lifted up, so that users can place and take cakes in a wide space, improving the user experience. However, during the process of the tray body being lifted up, the tray conveyor below stays in place, causing the belt to contact it and continue to rotate, generating additional friction. Such friction will accelerate the wear of the belt, reduce the service life of the belt, and thus affect the stability and efficiency of the conveying system. Summary of the invention

[0005] In view of the deficiencies of the prior art, the present invention provides a food tray conveying device, which solves the problems raised in the above background technology.

[0006] To achieve the above purpose, the present invention is implemented through the following technical solutions: a food tray conveyor device, including a carrying frame, two conveying shafts are rotatably penetrated on the carrying frame, a servo motor is fixedly installed on the outer wall of the carrying frame, the output end of the servo motor is fixedly connected to the conveying shaft on the left, the two conveying shafts are linked by belts, the servo motor is started, the output end of the servo motor rotates clockwise to drive the conveying shaft to rotate clockwise, and the rotation of the conveying shaft drives the belt to rotate clockwise, a blocking rod is fixedly installed on the inner wall of the carrying frame, and a slide groove is opened on the inner wall of the carrying frame, wherein the receiving device includes a slide plate, a tray body, a bottom plate, a lifting plate, a Z-shaped sheet and a rectangular block, and the lifting plate moves with a belt The movable skateboard moves, and the movement of the skateboard drives the tray body to move. The skateboard is slidably installed on the slide groove, the tray body slides through the top of the skateboard, the bottom plate slides through the bottom of the skateboard, the top of the bottom plate is fixedly installed on the bottom of the tray body, the lifting plate slides through the inner and outer walls of the skateboard, the Z-shaped piece is fixedly installed on the bottom of the lifting plate, the end of the Z-shaped piece away from the lifting plate is fixedly installed on the bottom of the inner wall of the skateboard, the rectangular block is fixedly installed on the outer side wall of the tray body, and a C-shaped groove is provided at the bottom of the lifting plate, the C-shaped groove contacts the top of the belt, and the C-shaped groove of the lifting plate is separated from the contact surface of the belt during the movement, so that the lifting plate loses the thrust applied by the belt and stops moving.

[0007] According to the above technical solution, a fan-shaped surface 1 is provided on the surface of the bottom plate away from the tray body. The fan-shaped surface 1 of the bottom plate contacts the circumferential surface of the blocking rod during movement, so that the bottom plate moves upward due to the resistance applied by the blocking rod. The Z-shaped piece itself is elastic. The lifting plate stretches the Z-shaped piece when moving, and the Z-shaped piece is squeezed and deformed. The deformed Z-shaped piece applies a reaction force to the lifting plate under the action of its own elasticity, and a limiting groove is provided on the top of the tray body.

[0008] According to the above technical solution, a rectangular groove is opened on the surface of the lifting plate close to the rectangular block, and the rectangular block contacts the bottom of the inner wall of the rectangular groove. The rectangular block contacts the top of the inner wall of the rectangular groove during movement, so that the rectangular block continues to move and drives the lifting plate to move upward.

[0009] According to the above technical solution, the expansion device includes a loading box, a cylindrical rod, a baffle, a push rod, a limit block, an elastic sheet, a contact block and a card block. The tray body moves upward while driving the loading box upward. The movement of the loading box drives the cylindrical rod upward. The loading box is fixedly penetrated through the inner wall of the tray body. The cylindrical rod is rotatably mounted on the inner wall of the loading box. The baffle is fixedly mounted on the circumferential surface of the cylindrical rod. The push rod slides through the top of the baffle. The limit block is fixedly mounted on the circumferential surface of the push rod. The elastic sheet is fixedly mounted on the circumferential surface of the push rod away from the limit block, and one end of the elastic sheet away from the push rod is fixedly mounted on the inner wall of the baffle. The push rod squeezes the elastic sheet when moving, and the elastic sheet is deformed due to the squeezing. The deformed elastic sheet applies a reaction force to the push rod. The contact block is fixedly mounted on the circumferential surface of the cylindrical rod, and the clamping block is fixedly mounted on the inner wall of the loading box. The baffle contacts the inner wall of the slide, and the surface of the baffle in contact with the inner wall of the slide separates during the movement, so that the obstruction imposed by the slide on the baffle is released.

[0010] According to the above technical solution, a No. 1 spiral spring is arranged between the cylindrical rod and the loading box, and the stretched No. 1 spiral spring is restored to drive the cylindrical rod to rotate. The surface of the limit block away from the push rod is provided with an arc surface 1, and the arc surface 1 contacts the inner wall of the limit groove. The arc surface 1 of the limit block is separated from the limit groove of the tray body during the movement, so that the limit imposed by the tray body on the baffle is released.

[0011] According to the above technical scheme, the protective device includes a hollow box, a T-shaped plate, a rubber plate, a No. 1 torsion spring, a resistance piece and a blocking piece. When the T-shaped plate moves, the No. 1 torsion spring is squeezed, and the No. 1 torsion spring is deformed due to the squeezing. The deformed No. 1 torsion spring applies a reaction force to the T-shaped plate. The hollow box is fixedly passed through the bottom of the slide plate, the T-shaped plate is slidably mounted on the inner wall of the hollow box, the rubber plate is fixedly mounted on the top of the T-shaped plate, the No. 1 torsion spring is fixedly mounted on the bottom of the T-shaped plate, and one end of the No. 1 torsion spring away from the T-shaped plate is fixedly mounted on the bottom of the inner wall of the hollow box, the resistance piece is fixedly mounted on the outer wall of the T-shaped plate, and the blocking piece is fixedly mounted on the inner wall of the hollow box. When the T-shaped plate moves downward, it drives the resistance piece downward. The bottom of the resistance piece contacts the top of the blocking piece during the movement, so that the resistance piece continues to move and is deformed due to the resistance applied by the blocking piece.

[0012] According to the above technical solution, the surface of the rubber plate away from the T-shaped plate is provided with corrugation 1, and the corrugation 1 contacts the bottom of the tray body. When the tray body moves downward, it contacts the corrugation 1 of the rubber plate, so that the movement of the tray body drives the rubber plate downward.

[0013] According to the above technical solution, the surface of the resistance sheet close to the blocking sheet is provided with arc surface 2, and the movement of the T-shaped plate drives the resistance sheet to move upward, and the arc surface 2 of the resistance sheet contacts the bottom of the blocking sheet, so that the speed at which the blocking sheet moves upward is slowed down by the resistance exerted by the blocking sheet, and the resistance sheet itself is elastic.

[0014] The present invention provides a food tray conveying device having the following beneficial effects:

[0015] (1) In the food processing tray conveyor, the bottom plate is moved upward by the resistance exerted by the blocking rod, and the movement of the bottom plate drives the tray body to move upward. When the bottom plate moves to a specified range, it contacts the blocking rod and drives the tray body to be lifted. The raised tray body is convenient for users to place and take cakes. The C-shaped groove is separated from the contact surface of the belt during movement, so that the lifting plate loses the thrust exerted by the belt and stops moving. After the tray body is lifted to the specified position, the movement of the slide plate is stopped to prevent the belt from continuing to move and rubbing against the C-shaped groove, resulting in serious wear and tear on the belt's service life.

[0016] (2) In the tray conveying device for food processing, the arc surface 1 separates from the limit groove during movement, so that the limit imposed on the baffle by the tray body is released. Only after the tray body is lifted can the user operate to release the limit imposed on the baffle, ensuring that the baffle can only be opened under standard operation, thereby improving the accuracy of operation. The movement of the contact block is blocked by the card block, so that the contact block stops moving. The baffle is opened after standard operation, avoiding the problem of too small a gap between the pastry and the tray body, which makes it inconvenient for the user to pick up the pastry.

[0017] (3) In the food processing tray conveying device, the deformed torsion spring No. 1 exerts a reaction force on the T-shaped plate, exerts a supporting force on the bottom of the tray body through the rubber plate, and uses the reaction force to slow down the speed of the T-shaped plate moving downward, effectively improving the stability of the tray body when moving up and down. The arc surface No. 2 contacts the barrier plate, so that the speed of the barrier plate moving upward is slowed down by the resistance exerted by the barrier plate. The resistance to the movement of the T-shaped plate is increased by the upward movement of the resistance plate, and the downward movement and intermittent collision with the barrier plate generate vibration, effectively improving the applicability of the resistance plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0019] Figure 2 It is a schematic diagram of the half-section structure of the main body of the present invention;

[0020] Figure 3 It is a schematic diagram of the internal structure of the receiving device of the present invention;

[0021] Figure 4 For the present invention Figure 3 The enlarged structural diagram at A in the middle;

[0022] Figure 5 It is a schematic diagram of the internal structure of the expansion device of the present invention;

[0023] Figure 6 For the present invention Figure 5 The enlarged structural diagram at B in the middle;

[0024] Figure 7 It is a schematic diagram of the internal structure of the protective device of the present invention;

[0025] Figure 8 For the present invention Figure 7 Enlarged structural diagram at point C in the middle.

[0026] In the figure: 1. Carrying frame; 2. Conveying shaft; 3. Servo motor; 4. Belt; 5. Blocking rod; 6. Slide plate; 7. Tray body; 8. Bottom plate; 9. Lifting plate; 10. Z-shaped sheet; 11. Rectangular block; 121. Loading box; 122. Cylindrical rod; 123. Baffle plate; 124. Push rod; 125. Limiting block; 126. Elastic sheet; 127. Contact block; 128. Card block; 131. Hollow box; 132. T-shaped plate; 133. Rubber plate; 134. No. 1 torsion spring; 135. Contact sheet; 136. Blocking sheet. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] See also Figure 1-4, one embodiment of the present invention is: a food tray conveying device, comprising a carrying frame 1, two conveying shafts 2 are rotatably penetrated on the carrying frame 1, a servo motor 3 is fixedly installed on the outer wall of the carrying frame 1, the output end of the servo motor 3 is fixedly connected to the conveying shaft 2 on the left, the two conveying shafts 2 are linked by a belt 4, a blocking rod 5 is fixedly installed on the inner wall of the carrying frame 1, a slide groove is opened on the inner wall of the carrying frame 1, and a receiving device is also included; wherein the receiving device includes a slide plate 6, a tray body 7, a bottom plate 8, a lifting plate 9, a Z-shaped sheet 10 and a rectangular block 11, the slide plate 6 is slidably installed on the slide groove, and the tray body 7 slides through It is worn on the top of the skateboard 6, the bottom plate 8 slides through the bottom of the skateboard 6, the top of the bottom plate 8 is fixedly installed on the bottom of the tray body 7, the lifting plate 9 slides through the inner and outer walls of the skateboard 6, the Z-shaped piece 10 is fixedly installed on the bottom of the lifting plate 9, and the end of the Z-shaped piece 10 away from the lifting plate 9 is fixedly installed on the bottom of the inner wall of the skateboard 6, and the rectangular block 11 is fixedly installed on the outer side wall of the tray body 7. A C-shaped groove is provided at the bottom of the lifting plate 9, and the C-shaped groove contacts the top of the belt 4. When it moves to the specified range through the bottom plate 8, it contacts the blocking rod 5 and drives the tray body 7 to be lifted. The lifting of the tray body 7 is convenient for users to place and take cakes.

[0029] The surface of the bottom plate 8 away from the tray body 7 is provided with a fan-shaped surface. The Z-shaped piece 10 itself is elastic. A limiting groove is provided on the top of the tray body 7. The elasticity of the Z-shaped piece 10 itself enables the C-shaped groove and the belt 4 to fit closely, ensuring that the rotation of the belt 4 can smoothly drive the lifting plate 9 to move, thereby improving stability during operation.

[0030] A rectangular groove is provided on the surface of the lifting plate 9 close to the rectangular block 11. The rectangular block 11 contacts the bottom of the inner wall of the rectangular groove. The rectangular block 11 contacts the top of the inner wall of the rectangular groove during its upward movement, ensuring that the slide plate 6 stops moving after the tray body 7 is lifted into place, thereby ensuring stable lifting.

[0031] When the present embodiment is working, when placing cakes, the servo motor 3 is started, the output end of the servo motor 3 rotates clockwise to drive the conveying shaft 2 to rotate clockwise, the conveying shaft 2 rotates to drive the belt 4 to rotate clockwise, the belt 4 rotates clockwise to apply a thrust to the lifting plate 9, and the lifting plate 9 moves to the right under the action of the thrust, the lifting plate 9 moves to drive the slide plate 6 to move to the right, the slide plate 6 moves to drive the tray body 7 to move to the right, the tray body 7 moves to drive the bottom plate 8 to move to the right, and the fan surface 1 of the bottom plate 8 contacts the circumferential surface of the blocking rod 5 during the movement, so that the bottom plate 8 moves upward due to the resistance applied by the blocking rod 5, and the bottom plate 8 moves to drive the tray body 7 to move upward, and by providing the fan surface 1, it is achieved that the bottom plate 8 contacts the blocking rod 5 when it moves to the specified range. The tray body 7 is also driven to be lifted, which is convenient for users to place cakes. When the tray body 7 moves upward, the rectangular block 11 is driven upward to move. The rectangular block 11 contacts the top of the inner wall of the rectangular groove during the movement, so that the rectangular block 11 continues to move and drives the lifting plate 9 to move upward. The lifting plate 9 stretches the Z-shaped piece 10 when moving, and the Z-shaped piece 10 is squeezed and deformed. The deformed Z-shaped piece 10 exerts a reaction force on the lifting plate 9 under the action of its own elasticity. At the same time, the C-shaped groove of the lifting plate 9 is separated from the contact surface of the belt 4 during the movement, so that the lifting plate 9 loses the thrust exerted by the belt 4 and stops moving, and the cakes are placed inside the tray body 7. The elasticity of the Z-shaped piece 10 itself realizes the close fit between the C-shaped groove and the belt 4, thereby ensuring that the belt 4 can drive the lifting plate 9 to move.

[0032] See also Figure 1-8 On the basis of the above embodiment, another embodiment of the present invention further includes an expansion device and a protective device; the expansion device includes a loading box 121, a cylindrical rod 122, a baffle 123, a push rod 124, a limit block 125, an elastic sheet 126, a contact block 127 and a clamping block 128, the loading box 121 is fixedly penetrated through the inner wall of the tray body 7, the cylindrical rod 122 is rotatably mounted on the inner wall of the loading box 121, the baffle 123 is fixedly mounted on the circumferential surface of the cylindrical rod 122, the push rod 124 slides through the top of the baffle 123, and the limit block 125 is fixedly mounted on the push rod 124. The elastic sheet 126 is fixedly installed on the circumferential surface of the push rod 124 away from the limit block 125, and one end of the elastic sheet 126 away from the push rod 124 is fixedly installed on the inner wall of the baffle 123. The contact block 127 is fixedly installed on the circumferential surface of the cylindrical rod 122, and the clamping block 128 is fixedly installed on the inner wall of the loading box 121. The baffle 123 contacts the inner wall of the slide plate 6, and is opened after standard operation through the baffle 123 to avoid the gap between the pastry and the tray body 7 being too small, which makes it inconvenient for the user to take it, and avoids the integrity of the pastry being affected by the narrow space when the user takes it.

[0033] A spiral spring No. 1 is arranged between the cylindrical rod 122 and the loading box 121, and an arc surface 1 is provided on the surface of the limit block 125 away from the push rod 124, and the arc surface 1 is in contact with the inner wall of the limit groove. After the tray body 7 is lifted, the user can perform standard operations to release the limit on the baffle 123, thereby effectively improving the accuracy of the operation and preventing the baffle 123 from being opened by mistake, causing the cakes to fall off.

[0034] The protective device includes a hollow box 131, a T-shaped plate 132, a rubber plate 133, a No. 1 torsion spring 134, a resistance piece 135 and a blocking piece 136. The hollow box 131 is fixedly passed through the bottom of the slide plate 6, the T-shaped plate 132 is slidably installed on the inner wall of the hollow box 131, the rubber plate 133 is fixedly installed on the top of the T-shaped plate 132, the No. 1 torsion spring 134 is fixedly installed on the bottom of the T-shaped plate 132, and one end of the No. 1 torsion spring 134 away from the T-shaped plate 132 is fixedly installed on the bottom of the inner wall of the hollow box 131, the resistance piece 135 is fixedly installed on the outer wall of the T-shaped plate 132, and the blocking piece 136 is fixedly installed on the inner wall of the hollow box 131. The rubber plate 133 applies a supporting force to the bottom of the tray body 7, thereby effectively improving the stability of the tray body 7 when it moves up and down.

[0035] The surface of the rubber plate 133 away from the T-shaped plate 132 is provided with corrugation 1, and the corrugation 1 contacts the bottom of the tray body 7. By providing the corrugation 1 on the rubber plate 133, the friction force generated when the bottom of the tray body 7 and the rubber plate 133 contact each other is increased, ensuring that the rubber plate 133 can fit tightly against the tray body 7.

[0036] The surface of the resistance piece 135 close to the blocking piece 136 is provided with a second arc surface. The resistance piece 135 itself is elastic. The resistance piece 135 moves upward to increase the resistance of the T-shaped plate 132. The resistance piece 135 moves downward to intermittently contact with the blocking piece 136 to generate vibration, which effectively improves the applicability of the resistance piece 135.

[0037] When the present embodiment is working, the tray body 7 moves upward and drives the loading box 121 to move upward. The loading box 121 moves and drives the cylindrical rod 122 to move upward. The cylindrical rod 122 moves and drives the baffle 123 to move upward. The baffle 123 is separated from the surface in contact with the inner wall of the slide plate 6 during the movement, so that the blocking applied by the slide plate 6 to the baffle 123 is released, and the push rod 124 is pulled to move in the direction of the elastic sheet 126. The push rod 124 squeezes the elastic sheet 126 during the movement, and the elastic sheet 126 is deformed by the squeezing. The deformed elastic sheet 126 applies a reaction force to the push rod 124. At the same time, the push rod 124 moves and drives the limit block 125 to move in the direction of the elastic sheet 126. The arc surface of the limit block 125 is separated from the limit groove of the tray body 7 during the movement, so that the tray body 7 can block the baffle The limit imposed by 123 is released. The user performs standard operations to release the limit imposed on the baffle 123 after the tray body 7 is lifted, which effectively improves the accuracy of the operation. After the limit imposed on the baffle 123 is released, the stretched No. 1 scroll spring is restored to drive the cylindrical rod 122 to rotate. The rotation of the cylindrical rod 122 drives the baffle 123 to rotate backward. At the same time, the rotation of the cylindrical rod 122 drives the contact block 127 to move in the direction of the block 128. The contact block 127 contacts the block 128 during the movement. The contact block 127 continues to move and is blocked by the block 128, so that the contact block 127 stops moving. At the same time, the baffle 123 stops rotating after rotating forty-five degrees. The baffle 123 is opened after standard operations to avoid the problem that the gap between the cake and the tray body 7 is too small, which makes it inconvenient for the user to take it.

[0038] When the tray body 7 moves downward, it contacts the corrugations of the rubber plate 133, so that the tray body 7 moves and drives the rubber plate 133 to move downward, and the rubber plate 133 moves and drives the T-shaped plate 132 to move downward. When the T-shaped plate 132 moves, it squeezes the No. 1 torsion spring 134, and the No. 1 torsion spring 134 is squeezed and deformed. The deformed No. 1 torsion spring 134 applies a reaction force to the T-shaped plate 132, so that the speed of the T-shaped plate 132 moving downward is slowed down by the reaction force. The rubber plate 133 applies a supporting force to the bottom of the tray body 7, which effectively improves the stability of the tray body 7 when it moves up and down. When the T-shaped plate 132 moves downward, it drives the contact sheet 135 to move downward. The bottom of the contact sheet 135 contacts the top of the first blocking sheet 136 during the movement, so that the contact sheet 135 continues to move downward. The movement is deformed by the resistance applied by the first barrier 136. When the contact surface of the contact piece 135 and the first barrier 136 is separated, the deformed contact piece 135 recovers under the action of its own elasticity. The contact piece 135 collides with the second barrier 136 during the recovery process, so that the contact piece 135 and the barrier 136 are intermittently in contact and generate vibration. When the No. 1 torsion spring 134 recovers and drives the T-shaped plate 132 to move upward, the movement of the T-shaped plate 132 drives the contact piece 135 upward. The arc surface 2 of the contact piece 135 contacts the bottom of the barrier 136, so that the upward movement speed of the barrier 136 is slowed down by the resistance applied by the barrier 136. The upward movement of the contact piece 135 increases the resistance to the movement of the T-shaped plate 132, and the downward movement generates vibration intermittently, which effectively improves the applicability of the contact piece 135.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A food tray conveyor device, comprising a carrying frame (1), characterized in that: Two conveying shafts (2) are rotatably penetrated on the carrying frame (1), a servo motor (3) is fixedly mounted on the outer wall of the carrying frame (1), the output end of the servo motor (3) is fixedly connected to the conveying shaft (2) on the left, the two conveying shafts (2) are linked via a belt (4), a blocking rod (5) is fixedly mounted on the inner wall of the carrying frame (1), a slide groove is provided on the inner wall of the carrying frame (1), and the carrying frame (1) also includes a receiving device, an expansion device and a protective device; The receiving device comprises a slide plate (6), a tray body (7), a bottom plate (8), a lifting plate (9), a Z-shaped sheet (10) and a rectangular block (11), wherein the slide plate (6) is slidably mounted on a slide groove, the tray body (7) slides through the top of the slide plate (6), the bottom plate (8) slides through the bottom of the slide plate (6), the top of the bottom plate (8) is fixedly mounted on the bottom of the tray body (7), the lifting plate (9) slides through the inner and outer walls of the slide plate (6), the Z-shaped sheet (10) is fixedly mounted on the bottom of the lifting plate (9), the end of the Z-shaped sheet (10) away from the lifting plate (9) is fixedly mounted on the bottom of the inner wall of the slide plate (6), the rectangular block (11) is fixedly mounted on the outer wall of the tray body (7), and a C-shaped groove is provided at the bottom of the lifting plate (9), and the C-shaped groove contacts the top of the belt (4); The surface of the bottom plate (8) away from the tray body (7) is provided with a fan-shaped surface, the Z-shaped sheet (10) itself is elastic, and the top of the tray body (7) is provided with a limiting groove; The lifting plate (9) is provided with a rectangular groove on its surface close to the rectangular block (11), and the rectangular block (11) is in contact with the bottom of the inner wall of the rectangular groove; The expansion device comprises a loading box (121), a cylindrical rod (122), a baffle (123), a push rod (124), a limit block (125), an elastic sheet (126), a contact block (127) and a clamping block (128); the loading box (121) is fixedly passed through the inner wall of the tray body (7); the cylindrical rod (122) is rotatably mounted on the inner wall of the loading box (121); the baffle (123) is fixedly mounted on the circumferential surface of the cylindrical rod (122); the push rod (124) is slidably passed through the top of the baffle (123); The limit block (125) is fixedly mounted on the circumferential surface of the push rod (124), the elastic sheet (126) is fixedly mounted on the circumferential surface of the push rod (124) away from the limit block (125), one end of the elastic sheet (126) away from the push rod (124) is fixedly mounted on the inner side wall of the baffle (123), the contact block (127) is fixedly mounted on the circumferential surface of the cylindrical rod (122), the clamping block (128) is fixedly mounted on the inner side wall of the loading box (121), and the baffle (123) is in contact with the inner side wall of the slide plate (6); A first spiral spring is arranged between the cylindrical rod (122) and the loading box (121); a first arc surface is formed on the surface of the limiting block (125) away from the push rod (124); and the first arc surface contacts the inner wall of the limiting groove; The protective device comprises a hollow box (131), a T-shaped plate (132), a rubber plate (133), a first torsion spring (134), a contact piece (135) and a blocking piece (136); the hollow box (131) is fixedly installed through the bottom of the slide plate (6); the T-shaped plate (132) is slidably installed on the inner wall of the hollow box (131); the rubber plate (133) is fixedly installed on the top of the T-shaped plate (132); the first torsion spring (134) is fixedly installed on the bottom of the T-shaped plate (132); one end of the first torsion spring (134) away from the T-shaped plate (132) is fixedly installed on the bottom of the inner wall of the hollow box (131); the contact piece (135) is fixedly installed on the outer wall of the T-shaped plate (132); and the blocking piece (136) is fixedly installed on the inner wall of the hollow box (131); The surface of the resisting piece (135) close to the blocking piece (136) is provided with a second arc surface, and the resisting piece (135) itself is elastic.

Images