CN211416137U

CN211416137U - A high accuracy former for PVC machined part

Info

Publication number: CN211416137U
Application number: CN201921990014.7U
Authority: CN
Inventors: 施超
Original assignee: Suzhou Hami Nao Pml Precision Mechanism Co ltd
Current assignee: Suzhou Hami Nao Pml Precision Mechanism Co ltd
Priority date: 2019-11-18
Filing date: 2019-11-18
Publication date: 2020-09-04
Anticipated expiration: 2029-11-18

Abstract

The utility model belongs to the technical field of the shaping, especially, a high accuracy former for PVC machined part unloads to current former inconvenience and the shaping quality is not good and the discharge rate is low, can not cool off fast and influence the solidification of work piece with higher speed, simultaneously, gathers materials and transports for inconvenient, has reduced machining efficiency's problem, now proposes following scheme: the improved multifunctional rack is characterized by comprising a rack, wherein a first motor is fixedly arranged at the middle position of the outer wall of one side of the rack, a base is vertically welded at the position of the outer wall of the other side of the rack, a first rotating shaft is connected at the middle position of one side of the first motor through the rack in a vertical and movable mode, and a first die body is fixedly arranged at one end, close to the base, of the first rotating shaft. The utility model discloses in, the former is unloaded conveniently and the shaping high quality, and the discharge rate is high, is equipped with the solidification process that the blast air structure can realize quick cooling in order to accelerate the work piece, simultaneously, and integrated type processing and collection material transportation are as an organic whole, improve machining efficiency.

Description

A high accuracy former for PVC machined part

Technical Field

The utility model relates to the field of forming technology, especially, relate to a high accuracy former for PVC machined part.

Background

The PVC machined part possesses advantages such as with low costs and corrosion resistance is good, uses comparatively commonly in the life, and the PVC machined part generally adopts extrusion molding, uses former to carry out processing often, and former's application is comparatively extensive.

The existing forming equipment is used, the forming quality is affected due to the fact that discharging is inconvenient, accuracy of die body matching is poor, material adhesion is low in discharging rate due to the fact that the material adhesion is on the inner wall, a blast structure is not arranged, rapid cooling cannot be achieved, the solidification of accelerated workpieces is affected, meanwhile, collecting and transporting are inconvenient, machining efficiency is reduced, and the use of the forming equipment is affected.

SUMMERY OF THE UTILITY MODEL

The utility model provides a high accuracy former for PVC machined part has solved former and has unloaded inconveniently and the shaping quality is not good and the ejection of compact rate is low, can not cool off fast and influenced the solidification of work piece with higher speed, simultaneously, gathers materials and transports for inconvenient, has reduced machining efficiency's problem.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a high-precision forming device for PVC workpieces comprises a rack, wherein a first motor is fixedly installed at the middle position of the outer wall of one side of the rack, a base is vertically welded at the position of the outer wall of the other side of the rack, a first rotating shaft is vertically and movably connected at the middle position of one side wall of the first motor through the rack, a first die body is fixedly installed at one end, close to the base, of the first rotating shaft, a charging barrel is vertically welded at the middle position of one side wall, close to the base, of the charging barrel, a second die body is fixedly installed at one side wall, close to the first rotating shaft, of the first die body, a first die holder is welded at one side wall, far away from the first rotating shaft, of the second die body, a second die holder is welded at one side wall, far away from the charging barrel, a same group of extrusion cavities are formed between the middle positions of the outer walls of two sides of the second die body, and the top one side position of feed cylinder has welded the feeder hopper perpendicularly, the horizontal fixed mounting of upper surface of frame has fan and case shell, and has welded respectively out tuber pipe and exhaust column with a lateral wall position that is close to the case shell bottom one side of fan, the top intermediate position fixed mounting of frame has the hollow tube, and the fixed cover of the lower extreme of hollow tube has connect the fan housing, the bottom inner wall intermediate position fixed mounting of frame has concave type holder, and the both sides wall front and back position of concave type holder all welds the installation cover.

Preferably, a pressing block is fixedly installed at the middle position of one side wall of the first die holder close to the second die body, a forming cavity matched with the pressing block correspondingly is formed between the positions of the outer walls of the two sides of the second die holder, the sliding cavities of the same group are formed between the top and the bottom of the outer walls of the two sides of the first die body, the first die holder and the pressing block, two groups of ejector rods are welded perpendicularly to the position of the inner wall of one side of the frame and are distributed symmetrically with the transverse axis of the first rotating shaft as the center, and the ejector rods are connected with the first die body, the first die holder and the pressing block in a perpendicular sliding mode through the sliding.

Preferably, the peripheral edge positions of the outer wall of one side of the first die holder and the second die holder, which are close to each other, are respectively and fixedly provided with a fixed rod and guide sleeves, the fixed rods and the guide sleeves are correspondingly matched, and the four groups of guide sleeves are distributed at the peripheral positions of the forming cavity.

Preferably, the fixed blocks are welded at the top of the inner wall and at the edge of one side of the bottom of the charging barrel, which are close to the second die body, the fixed blocks are symmetrically distributed by taking the transverse axis of the charging barrel as the center, the longitudinal section of each fixed block is in the shape of a right triangle, and the two fixed blocks are corresponding to the extrusion cavity at one side close to each other.

Preferably, the rear wall of frame is solid core structure, and the rear surface fixed mounting of frame has an electric box, the inside of electric box is provided with the power, and the input of first motor, heating jacket, second motor and fan all with the output electric connection of power.

Preferably, the base is provided with a second motor at a position on one side of the upper surface far away from the rack, a second rotating shaft is vertically and movably connected to the middle position of one side wall of the second motor, a threaded sleeve is slidably connected to the outer surface of the second rotating shaft, a push rod is fixedly mounted on the front surface of the threaded sleeve, the push rod is transversely mounted, and the push rod is arranged in front of the second rotating shaft in parallel.

Preferably, the one end that the second motor was kept away from to the push rod and the perpendicular through connection of a lateral wall intermediate position of feed cylinder, and the one end fixed mounting that the second motor was kept away from to the push rod has the piece of scraping, scrape the piece and be isosceles trapezoid structure, and scrape the inside that the piece set up at the feed cylinder, the surface of scraping the piece and the internal surface of feed cylinder contact, and scrape one side outer wall welding that the piece kept away from the push rod and have and extrude chamber assorted lug, the internal surface vertical welding that the feed cylinder is close to the second motor has the bumping post, and the longitudinal section shape of bumping post is circular, the welding has the seal cover that matches corresponding with the push rod between the both sides outer wall intermediate position of bumping post, and the seal cover slides and cup.

Preferably, the air outlet pipe is fixedly connected with the hollow pipe, positioning sleeves are welded at the bottom of one side wall of the box shell and the top of the other side of the box shell, the air exhaust pipe is fixedly connected with the box shell through the positioning sleeves positioned at the top, a stop door is movably arranged on the front wall of the box shell, a screen plate is connected to the inner surface of the box shell in a sliding mode, the screen plate is of a concave structure, two groups of active carbon blocks and two groups of filter membranes are fixedly arranged between the inner wall positions of the two sides of the screen plate, and the two groups of active carbon blocks and the two groups of.

Preferably, the concave clamping seats are vertically and movably connected with transmission rods through two adjacent groups of installation sleeves, the outer surfaces of the transmission rods are fixedly sleeved with rollers and two groups of fixed disks, two groups of transmission belts are slidably connected between the upper surface positions and the lower surface positions of the rollers, the two groups of fixed disks are horizontally distributed, and the rollers are arranged between the two adjacent groups of fixed disks.

Compared with the prior art, the beneficial effects of the utility model are that:

1. in the utility model, the ejector rod guided by the sliding cavity is used as an ejection part, when two groups of die bodies are separated after the forming is completed, acting force is applied to a workpiece adhered to the pressing block, so that the discharging operation is convenient, and the accuracy of die body matching is improved by matching the guiding action of the fixed rod and the guide sleeve, so that the forming quality is improved, the heating jacket is used as a heating body, and the material in the charging barrel is heated to be adhered to the inner wall by the surface material, so that the discharging rate is reduced;

2. in the utility model, the fan forms a wind channel through the air outlet pipe and the exhaust pipe, before air exhaust, the active carbon blocks and the filter membrane assembled and installed by the screen plate are sequentially subjected to adsorption filtration and filtration treatment to ensure the cleanliness of the air outlet, and then the exhaust body combined by the hollow pipe and the air hood is sent out along the forming area, thereby realizing rapid cooling to accelerate the solidification process of the workpiece;

3. in the utility model, the concave clamping seat is used as a workpiece collecting component, and the transmission rod which is directionally installed by the installation sleeve is rotated by external force, so as to drive the roller to rotate, at the moment, the conveying belt transports the PVC workpiece and cooperates with the fixed disk to provide limit positions on two sides so as to improve the stability of the operation of a transport structure, so that the integrated processing and the material collecting transportation of the equipment are integrated, and the processing efficiency is improved;

the utility model discloses, the former is unloaded conveniently and the shaping high quality, and the discharge rate is high, is equipped with the solidification process that the blast air structure can realize quick cooling in order to accelerate the work piece, and simultaneously, integrated type processing and collection material transportation are as an organic whole, improve machining efficiency.

Drawings

Fig. 1 is a schematic overall structure diagram of a high-precision forming device for PVC workpieces according to the present invention;

fig. 2 is a schematic view of a connection structure of a first mold body and a second mold body of a high-precision forming apparatus for PVC workpieces according to the present invention;

fig. 3 is a partial sectional view of a high-precision forming apparatus for PVC workpieces according to the present invention;

fig. 4 is a partial enlarged view of the high-precision forming equipment for PVC workpieces according to the present invention;

fig. 5 is a schematic structural view of the concave type holder of the high precision forming apparatus for PVC workpieces according to the present invention.

In the figure: the device comprises a machine frame 1, a first motor 2, a base 3, a first rotating shaft 4, a first die body 5, a charging barrel 6, a second die body 7, a first die holder 8, a pressing block 9, a second die holder 10, a forming cavity 11, a sliding cavity 12, a push rod 13, a fixing rod 14, a guide sleeve 15, an extrusion cavity 16, a fixing block 17, a heating jacket 18, a feeding hopper 19, a second motor 20, a second rotating shaft 21, a threaded sleeve 22, a push rod 23, a scraping block 24, a bump 25, a blocking column 26, a sealing sleeve 27, a fan 28, a box shell 29, an air outlet pipe 30, a hollow pipe 31, a fan cover 32, a positioning sleeve 33, an air exhaust pipe 34, a screen plate 35, an activated carbon block 36, a filter membrane 37, a concave clamping seat 38, an installation sleeve 39, a transmission rod 40, a.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Referring to fig. 1-5, a high precision forming device for PVC workpieces comprises a frame 1, a first motor 2 is fixedly installed at the middle position of the outer wall of one side of the frame 1, a base 3 is vertically welded at the position of the outer wall of the other side of the frame 1, a first rotating shaft 4 is vertically and movably connected at the middle position of one side wall of the first motor 2 through the frame 1, a first die body 5 is fixedly installed at one end of the first rotating shaft 4 close to the base 3, a charging barrel 6 is vertically welded at the middle position of one side wall of the frame 1 close to the base 3, a second die body 7 is fixedly installed at one side wall of the charging barrel 6 close to the first rotating shaft 4, a first die holder 8 is welded at one side wall of the first die body 5 far from the first rotating shaft 4, a second die holder 10 is welded at one side wall of the second die body 7 far from the charging barrel 6, a same group of extrusion cavities 16 is arranged between the middle positions of the outer walls of two, the outer surface of the charging barrel 6 is fixedly sleeved with a heating jacket 18, a feeding hopper 19 is vertically welded at one side of the top of the charging barrel 6, a fan 28 and a box shell 29 are horizontally and fixedly mounted on the upper surface of the rack 1, an air outlet pipe 30 and an air exhaust pipe 34 are respectively welded at one side of the bottom of the fan 28 and at one side of the side wall close to the box shell 29, a hollow pipe 31 is fixedly mounted at the middle position of the top of the rack 1, a fan cover 32 is fixedly sleeved at the lower end of the hollow pipe 31, a concave clamping seat 38 is fixedly mounted at the middle position of the inner wall of the bottom of the rack 1, and mounting sleeves 39 are welded at the.

A pressing block 9 is fixedly arranged at the middle position of one side wall of the first die holder 8 close to the second die body 7, a forming cavity 11 matched with the pressing block 9 is arranged between the positions of the outer walls of two sides of the second die holder 10, a same group of sliding cavities 12 are arranged between the top and the bottom positions of the outer walls of two sides of the first die body 5, the first die holder 8 and the pressing block 9, two groups of ejector rods 13 are vertically welded at the position of the inner wall of one side of the frame 1, the two groups of ejector rods 13 are symmetrically distributed by taking the transverse axis of the first rotating shaft 4 as the center, the ejector rods 13 are vertically and slidably connected with the first die body 5, the first die holder 8 and the pressing block 9 through the sliding cavities 12, fixed rods 14 and guide sleeves 15 are respectively and fixedly arranged at the peripheral edge positions of the outer wall of one side close to each other of the first die holder 8 and the second die holder 10, the fixed rods 14 are correspondingly matched with the guide sleeves 15, the four groups of guide sleeves 15 are, the two groups of fixing blocks 17 are symmetrically distributed by taking the transverse axis of the charging barrel 6 as a center, the longitudinal section of each fixing block 17 is in a right-angled triangle shape, one side, close to each other, of each fixing block 17 corresponds to the extrusion cavity 16, the rear wall of the rack 1 is in a solid structure, an electric box is fixedly installed on the rear surface of the rack 1, a power supply is arranged inside the electric box, the input ends of a first motor 2, a heating jacket 18, a second motor 20 and a fan 28 are electrically connected with the output end of the power supply, the second motor 20 is arranged at a position, far away from the rack 1, of the base 3 on one side of the upper surface, a second rotating shaft 21 is vertically and movably connected at the middle position of one side wall of the second motor 20, a threaded sleeve 22 is slidably connected to the outer surface of the second rotating shaft 21, a push rod 23 is fixedly installed on the front surface of the threaded sleeve 22, the push rod 23 is transversely installed, the push rod 23 is arranged in parallel in front of the second, and one end of the push rod 23 far away from the second motor 20 is fixedly provided with a scraping block 24, the scraping block 24 is in an isosceles trapezoid structure, the scraping block 24 is arranged inside the charging barrel 6, the outer surface of the scraping block 24 is contacted with the inner surface of the charging barrel 6, the outer wall of one side of the scraping block 24 far away from the push rod 23 is welded with a convex block 25 matched with the extrusion cavity 16, the inner surface of the charging barrel 6 close to the second motor 20 is vertically welded with a retaining column 26, the longitudinal section of the retaining column 26 is circular, a sealing sleeve 27 matched with the push rod 23 is welded between the middle positions of the outer walls of two sides of the retaining column 26, the sealing sleeve 27 is slidably sleeved at the outer surface position of the push rod 23, the air outlet pipe 30 is fixedly connected with a hollow pipe 31, the bottom of one side wall and the top position of the other side of the box shell 29 are both welded with positioning sleeves 33, the air exhaust pipe 34 is fixedly connected, the inner surface of the box shell 29 is connected with a screen plate 35 in a sliding mode, the screen plate 35 is of a concave structure, two groups of active carbon blocks 36 and two groups of filter membranes 37 are fixedly installed between the inner wall positions of two sides of the screen plate 35, the two groups of active carbon blocks 36 and the two groups of filter membranes 37 are distributed in a staggered mode, the concave clamping seat 38 is vertically and movably connected with a transmission rod 40 through two adjacent groups of installation sleeves 39, a roller 41 and two groups of fixed disks 43 are fixedly sleeved on the outer surface of the transmission rod 40, the same group of transmission belts 42 are connected between the upper surface position and the lower surface position of the two groups of rollers 41 in a sliding mode.

The working principle is as follows: the frame 1 is used as a frame body of equipment and provides support for installation of a forming mechanism, a first motor 2 drives a first rotating shaft 4 to rotate so as to control horizontal movement of a material pressing mechanism consisting of a first die body 5, a first die holder 8 and a pressing block 9, a second motor 20 operates to drive a second rotating shaft 21 to rotate, a push rod 23 installed by a screw sleeve 22 horizontally moves under the rotating action so as to control movement of an extrusion part consisting of a scraping block 24 and a lug 25 in a charging barrel 6 so as to extrude materials along a discharge channel consisting of a fixed block 17 and an extrusion cavity 16, at the moment, the pressing block 9 extrudes the second die body 7 and the second die holder 10 and realizes extrusion molding in a forming cavity 11 so as to obtain a PVC workpiece, a feeding channel of the materials is provided by a feeding hopper 19 so as to realize continuous forming operation, a stop column 26 and a stop column 27 form a limit body so as to prevent the materials from being reversely led out along a driving area, the ejector rod 13 guided by the sliding cavity 12 is used as an ejector part, when two groups of die bodies are separated after being formed, acting force is applied to a workpiece adhered to the pressing block 9, so that unloading operation is convenient, the guiding effect of the fixed rod 14 and the guide sleeve 15 is matched, the accuracy of die body matching is improved, so that the forming quality is improved, the heating jacket 18 is used as a heating body, materials in the charging barrel 6 are heated, surface materials are adhered to the inner wall, so that the discharging rate is reduced, the fan 28 forms a wind channel through the air outlet pipe 30 and the air exhaust pipe 34, before air exhaust, an active carbon block 36 and a filter membrane 37 which are assembled and installed through the screen plate 35 are sequentially subjected to adsorption filtration and filtration treatment, the cleanliness of air exhaust is ensured, then an exhaust body combined by the hollow pipe 31 and the air hood 32 is sent out along a forming area, so that rapid cooling is realized to accelerate the curing process of the workpiece, the wind power access passage for purification treatment is provided, the concave clamping seat 38 serves as a workpiece collecting component, the transmission rod 40 which is installed directionally through the installation sleeve 39 is rotated by external force, so that the roller 41 is driven to rotate, at the moment, the conveyor belt 42 transports PVC workpieces, the transmission rod is matched with the fixed disc 43 to provide limitation on two sides so as to improve the stability of operation of a transport structure, the equipment integration type processing and the material collecting transportation are integrated, and the processing efficiency is improved.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims

1. A high-precision forming device for PVC workpieces comprises a rack (1) and is characterized in that a first motor (2) is fixedly installed at the middle position of an outer wall of one side of the rack (1), a base (3) is perpendicularly welded at the position of an outer wall of the other side of the rack (1), a first rotating shaft (4) is perpendicularly and movably connected at the middle position of a side wall of the first motor (2) through the rack (1), a first die body (5) is fixedly installed at one end, close to the base (3), of the first rotating shaft (4), a charging barrel (6) is perpendicularly welded at the middle position of a side wall, close to the base (3), of the charging barrel (6), a second die body (7) is fixedly installed at the position of a side wall, close to the first rotating shaft (4), of the first die body (5), a first die holder (8) is welded at the position of a side wall, far away from the first rotating shaft (, and a second die holder (10) is welded at a position of one side wall of the second die body (7) far away from the charging barrel (6), a same group of extrusion cavities (16) are arranged between the intermediate positions of the outer walls of two sides of the second die body (7) and between the intermediate positions of one side wall of the second die holder (10), a heating jacket (18) is fixedly sleeved on the outer surface of the charging barrel (6), a feeding hopper (19) is vertically welded at a position of one side of the top of the charging barrel (6), a fan (28) and a box shell (29) are horizontally and fixedly installed on the upper surface of the rack (1), an air outlet pipe (30) and an air exhaust pipe (34) are respectively welded at one side of the bottom of the fan (28) and at a position of one side wall close to the box shell (29), a hollow pipe (31) is fixedly installed at the intermediate position of the top of the rack (1), a fan cover (32) is fixedly installed at the lower end of the hollow pipe (, and the front and back positions of the two side walls of the concave clamping seat (38) are welded with mounting sleeves (39).

2. The high-precision forming device for the PVC workpieces according to claim 1, it is characterized in that a pressing block (9) is fixedly arranged at the middle position of one side wall of the first die holder (8) close to the second die body (7), and a forming cavity (11) which is correspondingly matched with the pressing block (9) is arranged between the outer walls of the two sides of the second die holder (10), the same group of sliding cavities (12) are arranged between the top and the bottom of the outer walls of the two sides of the first die body (5), the first die holder (8) and the pressing block (9), and two groups of push rods (13) are vertically welded on the inner wall of one side of the frame (1), the two groups of push rods (13) are symmetrically distributed by taking the transverse axis of the first rotating shaft (4) as the center, and the ejector rod (13) is vertically connected with the first die body (5), the first die holder (8) and the pressing block (9) in a sliding mode through the sliding cavity (12).

3. The high-precision forming device for the PVC machined parts is characterized in that a fixed rod (14) and a guide sleeve (15) are respectively and fixedly installed at the peripheral edge position of the outer wall of one side, close to each other, of the first die holder (8) and the second die holder (10), the fixed rod (14) is correspondingly matched with the guide sleeve (15), and four groups of the guide sleeves (15) are distributed at the peripheral position of the forming cavity (11).

4. The high-precision forming device for the PVC machined part is characterized in that fixing blocks (17) are welded at the positions, close to the side edges of the top and the bottom of the inner wall of the second die body (7), of the material cylinder (6), the two groups of fixing blocks (17) are symmetrically distributed by taking the transverse axis of the material cylinder (6) as the center, the longitudinal section of each fixing block (17) is in the shape of a right-angled triangle, and the side, close to each other, of the two groups of fixing blocks (17) corresponds to the extrusion cavity (16).

5. The high-precision forming device for the PVC machined part is characterized in that the rear wall of the machine frame (1) is of a solid structure, an electric box is fixedly mounted on the rear surface of the machine frame (1), a power supply is arranged in the electric box, and the input ends of the first motor (2), the heating jacket (18), the second motor (20) and the fan (28) are electrically connected with the output end of the power supply.

6. The high-precision forming device for the PVC machined part is characterized in that a second motor (20) is arranged at a position, far away from the upper surface of the rack (1), of the base (3), a second rotating shaft (21) is vertically and movably connected to the middle position of one side wall of the second motor (20), a threaded sleeve (22) is slidably connected to the outer surface of the second rotating shaft (21), a push rod (23) is fixedly mounted on the front surface of the threaded sleeve (22), the push rod (23) is transversely mounted, and the push rod (23) is arranged in front of the second rotating shaft (21) in parallel.

7. The high-precision forming device for the PVC machined part is characterized in that one end, far away from the second motor (20), of the push rod (23) is vertically connected with the middle position of one side wall of the charging barrel (6) in a penetrating manner, one end, far away from the second motor (20), of the push rod (23) is fixedly provided with a scraping block (24), the scraping block (24) is of an isosceles trapezoid structure, the scraping block (24) is arranged inside the charging barrel (6), the outer surface of the scraping block (24) is in contact with the inner surface of the charging barrel (6), the outer wall, far away from the push rod (23), of the scraping block (24) is welded with a convex block (25) matched with the extrusion cavity (16), the inner surface, close to the second motor (20), of the charging barrel (6) is vertically welded with a blocking column (26), the blocking column (26) is circular in longitudinal section, and a sealing sleeve (27) matched with the push rod (23) is welded between the middle positions of the outer walls of two sides of the blocking column (26), and the sealing sleeve (27) is sleeved on the outer surface of the push rod (23) in a sliding manner.

8. The high-precision forming equipment for the PVC machined part is characterized in that the air outlet pipe (30) is fixedly connected with a hollow pipe (31), positioning sleeves (33) are welded at the bottom of one side wall and the top of the other side of the box shell (29), the air exhaust pipe (34) is fixedly connected with the box shell (29) through the positioning sleeves (33) positioned at the top, a stop door is movably arranged on the front wall of the box shell (29), a screen plate (35) is connected to the inner surface of the box shell (29) in a sliding mode, the screen plate (35) is of a concave structure, two groups of active carbon blocks (36) and two groups of filter membranes (37) are fixedly arranged between the inner wall positions of the two sides of the screen plate (35), and the two groups of active carbon blocks (36) and the two groups of filter membranes (37) are distributed in a staggered mode.

9. The high-precision forming device for the PVC machined parts is characterized in that the concave clamping seats (38) are vertically and movably connected with a transmission rod (40) through two adjacent groups of mounting sleeves (39), the outer surface of the transmission rod (40) is fixedly sleeved with a roller (41) and two groups of fixing discs (43), the upper surface and the lower surface of the two groups of rollers (41) are connected with a same group of conveyor belts (42) in a sliding mode, the two groups of fixing discs (43) are horizontally distributed, and the roller (41) is arranged between two adjacent groups of fixing discs (43).