Wood-plastic formwork temper mill

Abstract

The utility model discloses a wood-plastic template temper mill, which comprises a temper mill for mounting and supporting, a push plate device, a cutting device and a temper mill, the push plate device, the cutting device and the temper mill are arranged on the temper mill, the push plate device and the temper mill are respectively arranged at two ends of the moving direction of a wood-plastic template, and the cutting device is positioned between the push plate device and the temper mill. The plate pushing device is arranged in a telescopic mode so as to be used for pushing the wood-plastic formwork arranged on the leveling table in a supported mode to the leveling device. And the cutting device is used for positioning the passing wood-plastic template and cutting and shaping the two sides of the positioned wood-plastic template in the width direction. The flattening device is used for rolling and flattening the upper surface and the lower surface of the passing wood-plastic formwork. The novel wood-plastic formwork temper mill is high in automation degree, low in labor intensity of workers and compact and reasonable in overall structural layout, the cutting and shaping quality and the cutting and shaping speed can be improved, and then the overall machining efficiency of wood-plastic formworks is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of wood-plastic template processing, in particular to a wood-plastic template leveling machine. Background Art

[0002] With the rapid development of my country's national economy and the improvement of people's living standards, people's demand for wood is increasing day by day, while the development speed of natural forestry is far behind the market demand for wood. In order to alleviate the contradiction between supply and demand of wood, many wood-plastic materials have appeared in various places to replace wood. Wood-plastic, also known as wood composite material, is a material mainly made of plastic as raw material to replace wood. It is made of plastic steel and PVC as raw materials. Its promotion and application can save a lot of natural wood and is conducive to protecting the ecological environment. Wood-plastic has better UV resistance and lower thermal expansion and contraction performance, and is as easy to process as wood. As an environmentally friendly new material, wood-plastic composite materials have attracted people's attention.

[0003] During the WPC processing stage, the raw materials are mixed and put into a screw extruder, and the extruded blanks are squeezed into shape through a mold. However, the surface of the molded WPC is still rough, which requires the next step: sending the newly formed WPC into a roller leveling machine to press the surface of the WPC template smooth.

[0004] In the patent document with patent number CN204773463U, a wood-plastic formwork roller leveling machine is disclosed, which uses hydraulic pressure to adjust the height of the roller to adapt to the leveling of wood-plastic with different thicknesses. However, the device cannot cut the wood-plastic formwork. Utility Model Content

[0005] The utility model provides a wood-plastic template leveling machine to solve the technical problem that the existing leveling machine cannot cut the wood-plastic template.

[0006] The technical solution adopted by the utility model is as follows:

[0007] A wood-plastic formwork leveling machine comprises: a leveling table for installation and support, and a push plate device, a cutting device and a leveling device arranged on the leveling table, wherein the push plate device and the leveling device are arranged at two ends of the moving direction of the wood-plastic formwork, and the cutting device is located between the push plate device and the leveling device; the push plate device is telescopically arranged to push the wood-plastic formwork supported on the leveling table toward the leveling device; the cutting device is used to position the passed wood-plastic formwork and cut and shape both sides of the positioned wood-plastic formwork in the width direction; the leveling device is used to roll and level the upper and lower surfaces of the passed wood-plastic formwork.

[0008] Furthermore, the leveling platform includes a platform and a plurality of legs vertically supporting the platform; the pushing plate device includes a supporting plate fixed on the platform, a first telescopic component telescopically arranged along the moving direction of the wood-plastic formwork, and a pushing plate for pushing the wood-plastic formwork to move, and the two ends of the first telescopic component are respectively connected to the supporting plate and the pushing plate.

[0009] Furthermore, the cutting device includes two moving blocks spaced apart along the width direction of the table, a first driving mechanism for driving the two moving blocks to move synchronously, and two sets of cutting mechanisms connected to the two moving blocks; the first driving mechanism is connected to the table, and its driving ends are respectively connected to the two moving blocks, so as to drive the two moving blocks to move relatively closer or farther away from each other, thereby relatively clamping and positioning the passing wood-plastic formwork; the two sets of cutting mechanisms are used to cut and shape both sides of the width of the wood-plastic formwork positioned between the two moving blocks.

[0010] Furthermore, the first driving mechanism includes a first motor fixed to the table, and a bidirectional screw connected to the output end of the first motor; the bidirectional screw is arranged along the width direction of the table, and the external threads on the outer circles at both ends of the bidirectional screw have opposite rotation directions; the two moving blocks are respectively threadedly connected to the outer circles at both ends of the bidirectional screw.

[0011] Furthermore, each cutting mechanism includes a second motor connected to a corresponding moving block, a bevel gear assembly connected to an output end of the second motor, and a cutting disk connected to an output end of the bevel gear assembly; the moving block is hollow, the second motor is connected to the bottom end of the moving block, the bevel gear assembly is arranged in the moving block, the cutting disk is located on the inner side of the moving block, and the output end of the bevel gear assembly passes through the side wall of the moving block and is connected to the cutting disk.

[0012] Furthermore, the cutting device also includes a sliding rod arranged parallel to and spaced from the bidirectional lead screw, the sliding rod is connected to the table, and the two moving blocks are respectively slidably arranged on the sliding rod.

[0013] Furthermore, the table top is provided with two movable grooves which are spaced apart along its width direction and penetrate the plate surface; the bidirectional screw rod and the slide rod are both located under the table top, the two movable blocks are respectively arranged in the two movable grooves, and the two cutting discs are located above the table top.

[0014] Furthermore, the leveling device includes a bracket vertically supported on the table, an upper roller and a lower roller spaced apart and horizontally arranged, and a second telescopic component for driving the upper roller to move up and down; the second telescopic component is vertically arranged and its upper end is connected to the bracket, and its opposite lower end is connected to the upper roller; the lower roller is horizontally arranged on the table.

[0015] Furthermore, the bracket includes two pillars arranged laterally at intervals and vertically supported on the table, and a crossbeam horizontally connected to the top ends of the two pillars, and the opposite inner walls of the two pillars are each provided with a concave guide groove extending in the height direction; the second telescopic assembly includes two second electric telescopic rods vertically limited in the two guide grooves, the upper ends of the two second electric telescopic rods are respectively fixedly connected to the crossbeam, and the lower ends of the two second electric telescopic rods are respectively rotatably connected to the upper roller; a concave mounting groove is also processed on the table, and the lower roller is rotatably installed in the mounting groove, and the top end protrudes upward from the mounting groove.

[0016] Furthermore, the leveling device also includes a third driving mechanism, which includes: two connecting blocks connected to the bottom ends of the two second electric telescopic rods, and a third motor connected to one of the connecting blocks, and the driving end of the third motor is connected to the upper roller; the bottom of the guide groove of the pillar close to the third motor passes through the pillar to allow the third motor to slide up and down and thereby limit and guide the movement of the third motor.

[0017] The utility model has the following beneficial effects:

[0018] The wood-plastic formwork leveling machine of the utility model integrates the automatic movement, cutting and shaping and roller leveling of the formwork, has a high degree of automation, low labor intensity of workers, and a compact and reasonable overall structural layout; compared with the prior art, the wood-plastic formwork leveling machine of the utility model not only includes a leveling device for roller-leveling the surface thereof, but also includes a cutting device for cutting and shaping the wood-plastic formwork before leveling, and positioning is first performed and then cutting is performed on both sides during cutting and shaping, which not only improves the cutting and shaping quality, but also improves the cutting and shaping speed by cutting on both sides, thereby improving the overall processing efficiency of the wood-plastic formwork.

[0019] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0021] Figure 1 This is a schematic diagram of the spatial structure of a wood-plastic formwork flattening machine according to a preferred embodiment of the utility model;

[0022] Figure 2 yes Figure 1 Schematic diagram of the bottom structure of the wood-plastic formwork flattening machine;

[0023] Figure 3 yes Figure 1Schematic diagram of the spatial structure of the intermediate leveling device;

[0024] Figure 4 yes Figure 3 A schematic diagram of a portion of the structure of the intermediate leveling device;

[0025] Figure 5 yes Figure 1 Schematic diagram of the spatial structure of the cutting device.

[0026] Legend:

[0027] 1. Leveling table; 101. Tabletop; 102. Supporting feet; 2. Pushing plate device; 201. Supporting plate; 202. First telescopic assembly; 203. Pushing plate; 3. Cutting device; 301. Moving block; 302. First motor; 303. Bidirectional screw rod; 304. Second motor; 305. Cutting disc; 306. Sliding rod; 307. Movable groove; 4. Leveling device; 401. Upper roller; 402. Lower roller; 403. Pillar; 404. Crossbeam; 405. Second electric telescopic rod; 406. Connecting block; 407. Third motor. DETAILED DESCRIPTION

[0028] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. However, the present invention can be implemented in a variety of different ways as defined and covered below.

[0029] Reference Figure 1 The preferred embodiment of the utility model provides a wood-plastic formwork leveling machine, comprising: a leveling platform 1 for installation support, and a push plate device 2, a cutting device 3 and a leveling device 4 arranged on the leveling platform 1, the push plate device 2 and the leveling device 4 are arranged at both ends of the moving direction of the wood-plastic formwork, and the cutting device 3 is located between the push plate device 2 and the leveling device 4. The push plate device 2 is telescopically arranged to push the wood-plastic formwork supported on the leveling platform 1 toward the leveling device 4. The cutting device 3 is used to position the passing wood-plastic formwork and cut and shape both sides of the positioned wood-plastic formwork in the width direction. The leveling device 4 is used to roll and level the upper and lower surfaces of the passing wood-plastic formwork.

[0030] When the wood-plastic formwork leveling machine of the utility model is working, the push plate device 2, the cutting device 3 and the leveling device 4 are first started. After the push plate device 2 is started, the wood-plastic formwork supported on the leveling platform 1 is pushed toward the leveling device 4. When the wood-plastic formwork passes through the cutting device 3, the cutting device 3 first positions the wood-plastic formwork, and then cuts both sides of the positioned wood-plastic formwork in the width direction to shape the wood-plastic formwork. The modified wood-plastic formwork continues to move toward the leveling device 4. When passing through the leveling device 4, the leveling device rolls the upper surface and the lower surface thereof respectively to make the surface of the wood-plastic formwork smooth and flat, and the leveled wood-plastic formwork is discharged from the leveling platform 1.

[0031] The wood-plastic formwork leveling machine of the utility model integrates the automated movement, cutting and shaping and roller leveling of the formwork, has a high degree of automation, low labor intensity of workers, and a compact and reasonable overall structural layout; compared with the prior art, the wood-plastic formwork leveling machine of the utility model not only includes a leveling device 4 for roller leveling the surface thereof, but also includes a cutting device 3 for cutting and shaping the wood-plastic formwork before leveling, and when cutting and shaping, positioning is first performed and then cutting is performed on both sides, which not only improves the cutting and shaping quality, but also improves the cutting and shaping speed by cutting on both sides, thereby improving the overall processing efficiency of the wood-plastic formwork.

[0032] Alternatively, if Figure 1 As shown, the leveling platform 1 includes a platform 101 and a plurality of legs 102 vertically supporting the platform 101 . The overall structure of the leveling platform 1 is simple and easy to manufacture.

[0033] Alternatively, if Figure 1 As shown, the push plate device 2 includes a support plate 201 fixed on the table 101, a first telescopic assembly 202 telescopically arranged along the moving direction of the wood-plastic formwork, and a push plate 203 for pushing the wood-plastic formwork to move, and the two ends of the first telescopic assembly 202 are respectively connected to the support plate 201 and the push plate 203. In this optional solution, the first telescopic assembly 202 includes two first electric telescopic rods arranged side by side and spaced apart, and the two ends of the two first electric telescopic rods are respectively connected to the support plate 201 and the push plate 203; in this optional solution, the push plate device 2 has a simple structure, and the two first electric telescopic rods can be synchronously extended by electric control to push the wood-plastic formwork toward the leveling device 4.

[0034] Alternatively, if Figure 1 and Figure 5 As shown, the cutting device 3 includes two moving blocks 301 spaced apart along the width direction of the table 101, a first driving mechanism for driving the two moving blocks 301 to move synchronously, and two sets of cutting mechanisms connected to the two moving blocks 301. The first driving mechanism is connected to the table 101, and its driving ends are respectively connected to the two moving blocks 301, so as to drive the two moving blocks 301 to move relatively closer or farther away, thereby relatively clamping and positioning the passing wood-plastic formwork. The two sets of cutting mechanisms are used to cut and shape both sides of the width of the wood-plastic formwork positioned between the two moving blocks 301.

[0035] In this option, if Figure 5As shown, the first driving mechanism includes a first motor 302 fixed to the table 101, and a bidirectional screw 303 connected to the output end of the first motor 302. The bidirectional screw 303 is arranged along the width direction of the table 101, and the external threads on the outer circles at both ends of the bidirectional screw 303 are rotated in opposite directions. The two moving blocks 301 are respectively threadedly connected to the outer circles at both ends of the bidirectional screw 303. When working, the first motor 302 is started, and the first motor 302 drives the bidirectional screw 303 to rotate. When the bidirectional screw 303 rotates, it drives the two moving blocks 301 threadedly connected thereto to move synchronously to be relatively close or relatively far away, so as to clamp and position the two sides of the wood-plastic formwork of different widths, improve the cutting quality of the wood-plastic formwork in the later stage, and has a wide range of adaptability.

[0036] In this option, if Figure 5 As shown, each cutting mechanism includes a second motor 304 connected to a corresponding moving block 301, a bevel gear assembly connected to the output end of the second motor 304, and a cutting disc 305 connected to the output end of the bevel gear assembly. The moving block 301 is hollow, the second motor 304 is connected to the bottom end of the moving block 301, the bevel gear assembly is arranged in the moving block 301, the cutting disc 305 is located on the inner side of the moving block 301, and the output end of the bevel gear assembly is connected to the cutting disc 305 after passing through the side wall of the moving block 301. In this optional solution, the moving block 301 is hollow, and the bevel gear assembly is arranged in the moving block 301, which can protect the bevel gear assembly; after the wood-plastic formwork is positioned, the second motor 304 is started, and the second motor 304 drives the cutting disc 305 to rotate through the bevel gear assembly (the existing conventional structure, including two bevel gears with intersecting axes), so as to cut the corresponding side of the wood-plastic formwork for shaping.

[0037] Preferably, if Figure 5 As shown, the cutting device 3 also includes a slide bar 306 arranged in parallel and spaced relation with the bidirectional screw rod 303, the slide bar 306 is connected to the inside of the table 101, and the two moving blocks 301 are respectively slidably penetrated on the slide bar 306; in this preferred embodiment, the slide bar 306 is used to cooperate with the bidirectional screw rod 303 to stably support the moving block 301, and at the same time, the movement of the moving block 301 on the bidirectional screw rod 303 is limited and guided, thereby improving the stability and accuracy of the movement of the moving block 301, so as to improve the positioning accuracy of the wood-plastic formwork.

[0038] In this option, if Figure 2 and Figure 5As shown, the table 101 is also provided with two movable grooves 307 spaced apart along the width direction and penetrating the plate surface. The bidirectional screw rod 303 and the slide rod 306 are both located under the table 101, the two moving blocks 301 are respectively arranged in the two movable grooves 307, and the two cutting discs 305 are located above the table 101. In this optional solution, only the moving block 301 part and the cutting disc 305 of the cutting device 3 are located above the table 101, thereby simplifying the surface structure of the table 101, facilitating the smooth movement of the wood-plastic formwork on the table 101, and also effectively reducing the debris generated by cutting from entering the cutting device 3, thereby improving the working stability of the cutting device 3 and extending its service life.

[0039] Alternatively, if Figure 1 As shown, the leveling device 4 includes a bracket vertically supported on the table 101, an upper roller 401 and a lower roller 402 spaced apart and horizontally arranged, and a second telescopic assembly for driving the upper roller 401 to move up and down. The second telescopic assembly is vertically arranged and its upper end is connected to the bracket, and its opposite lower end is connected to the upper roller 401. The lower roller 402 is arranged horizontally on the table 101.

[0040] In this option, if Figure 3 and Figure 4 As shown, the bracket includes two pillars 403 arranged horizontally and spaced apart and vertically supported on the table 101, and a crossbeam 404 horizontally connected to the top of the two pillars 403, and the inner side walls opposite to each other of the two pillars 403 are each provided with a concave guide groove extending in the height direction. The second telescopic assembly includes two second electric telescopic rods 405 vertically limited in the two guide grooves, the upper ends of the two second electric telescopic rods 405 are respectively fixedly connected to the crossbeam 404, and the lower ends of the two second electric telescopic rods 405 are respectively rotatably connected to the upper roller 401. The table 101 is also processed with a concave mounting groove, and the lower roller 402 is rotatably installed in the mounting groove, and the top end protrudes upward from the mounting groove. During operation, the two second electric telescopic rods 405 are started, and the two second electric telescopic rods 405 are extended synchronously to drive the upper roller 401 to move downward toward the lower roller 402. When the gap between the upper roller 401 and the lower roller 402 meets the design requirements, the second electric telescopic rods 405 stop. When the wood-plastic formwork passes between the upper roller 401 and the lower roller 402 under the action of the push plate device 2, the upper and lower surfaces of the wood-plastic formwork are rolled smooth by the upper roller 401 and the lower roller 402.

[0041] Preferably, if Figure 4As shown, the leveling device 4 also includes a third driving mechanism, which includes: two connecting blocks 406 connected to the bottom ends of the two second electric telescopic rods 405, and a third motor 407 connected to one of the connecting blocks 406, and the driving end of the third motor 407 is connected to the upper roller 401. The bottom of the guide groove of the support 403 close to the third motor 407 passes through the support 403, so that the third motor 407 can slide up and down and pass through, thereby limiting and guiding the movement of the third motor 407. In this preferred embodiment, when the wood-plastic template passes through the leveling device 4, the third motor 407 is started to drive the upper roller 401 to rotate. Through the rotation of the upper roller 401, on the one hand, it cooperates with the rolling and leveling effect of the lower roller 402 on the passing wood-plastic template, and on the other hand, it also provides a pulling force for the movement of the wood-plastic template, so as to pull the wood-plastic template to smoothly pass through the gap between the upper roller 401 and the lower roller 402.

[0042] The overall working principle of the wood-plastic formwork leveling machine of the utility model is as follows: by starting the first electric telescopic rod, the first electric telescopic rod pushes the pushing plate 203 to further push the wood-plastic formwork toward the leveling device 4; by starting the first motor 302, the first motor 302 drives the bidirectional screw rod 303 to rotate, so that the two moving blocks 301 move relative to or toward each other on the bidirectional screw rod 303, and at the same time, the moving block 301 drives the second motor 304 to move, and further by starting the second motor 304, the second motor 304 drives the connected cutting disk 305 to rotate, so that the cutting disk 305 cuts the wood-plastic formwork; further starting the second electric telescopic rod 405, so that the upper roller 401 and the connecting block 406 move downward together, so that the wood-plastic formworks of different thicknesses can be adapted, and further by the third motor 407, the third motor 407 drives the upper roller 401 to rotate, so as to cooperate with the lower roller 402 to roll and level the wood-plastic formwork.

[0043] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A wood-plastic formwork flattening machine, characterized in that: include: A leveling platform (1) having a supporting function for installation, and a push plate device (2), a cutting device (3) and a leveling device (4) arranged on the leveling platform (1), wherein the push plate device (2) and the leveling device (4) are arranged at two ends of the moving direction of the wood-plastic formwork, and the cutting device (3) is located between the push plate device (2) and the leveling device (4); The push plate device (2) is telescopically arranged to push the wood-plastic formwork supported on the leveling platform (1) toward the leveling device (4); The cutting device (3) is used to position the passing wood-plastic formwork and to cut and shape both sides of the positioned wood-plastic formwork in the width direction; The leveling device (4) is used to roll and level the upper and lower surfaces of the passing wood-plastic formwork.

2. The wood-plastic formwork flattening machine according to claim 1, characterized in that: The leveling platform (1) comprises a platform (101) and a plurality of supporting legs (102) vertically supporting the platform (101); The push plate device (2) comprises a support plate (201) fixed on a platform (101), a first telescopic assembly (202) telescopically arranged along the moving direction of the wood-plastic formwork, and a push plate (203) for pushing the wood-plastic formwork to move, wherein two ends of the first telescopic assembly (202) are respectively connected to the support plate (201) and the push plate (203).

3. The wood-plastic formwork flattening machine according to claim 2, characterized in that: The cutting device (3) comprises two moving blocks (301) spaced apart along the width direction of the table (101), a first driving mechanism for driving the two moving blocks (301) to move synchronously, and two sets of cutting mechanisms connected to the two moving blocks (301); The first driving mechanism is connected to the platform (101), and its driving ends are respectively connected to the two moving blocks (301) to drive the two moving blocks (301) to move relatively closer or farther away, thereby relatively clamping and positioning the passing wood-plastic formwork; The two sets of cutting mechanisms are used to cut and shape the width sides of the wood-plastic template located between the two moving blocks (301).

4. The wood-plastic formwork flattening machine according to claim 3, characterized in that: The first driving mechanism comprises a first motor (302) fixed to the platform (101), and a bidirectional screw rod (303) connected to the output end of the first motor (302); The bidirectional screw rod (303) is arranged along the width direction of the table plate (101), and the external threads on the outer circles at both ends of the bidirectional screw rod (303) have opposite rotation directions; The two moving blocks (301) are respectively threadedly connected to the outer circles at both ends of the bidirectional screw rod (303).

5. The wood-plastic formwork flattening machine according to claim 4, characterized in that: Each cutting mechanism comprises a second motor (304) connected to a corresponding moving block (301), a bevel gear assembly connected to an output end of the second motor (304), and a cutting disc (305) connected to an output end of the bevel gear assembly; The moving block (301) is hollow, the second motor (304) is connected to the bottom end of the moving block (301), the bevel gear assembly is arranged in the moving block (301), the cutting disk (305) is located on the inner side of the moving block (301), and the output end of the bevel gear assembly passes through the side wall of the moving block (301) and is connected to the cutting disk (305).

6. The wood-plastic formwork flattening machine according to claim 4, characterized in that: The cutting device (3) further comprises a slide bar (306) arranged in parallel and spaced relation with the bidirectional screw rod (303); the slide bar (306) is connected to the table plate (101), and the two moving blocks (301) are respectively slidably arranged on the slide bar (306).

7. The wood-plastic formwork flattening machine according to claim 6, characterized in that: The table plate (101) is also provided with two movable grooves (307) which are spaced apart along the width direction thereof and penetrate the plate surface; The bidirectional screw rod (303) and the slide rod (306) are both located under the table (101), the two moving blocks (301) are respectively arranged in two movable grooves (307), and the two cutting discs (305) are located above the table (101).

8. The wood-plastic formwork flattening machine according to claim 2, characterized in that: The leveling device (4) comprises a bracket vertically supported on the table (101), an upper roller (401) and a lower roller (402) spaced apart and horizontally arranged, and a second telescopic component for driving the upper roller (401) to move up and down; The second telescopic assembly is vertically arranged and its upper end is connected to the bracket, and its opposite lower end is connected to the upper roller (401); The lower roller (402) is arranged transversely on the table (101).

9. The wood-plastic formwork flattening machine according to claim 8, characterized in that: The support comprises two pillars (403) arranged transversely and spaced apart and vertically supported on the platform (101), and a crossbeam (404) horizontally connected to the top ends of the two pillars (403), and guide grooves which are concave and extend in the height direction are respectively provided on the inner side walls opposite to each other of the two pillars (403); The second telescopic assembly comprises two second electric telescopic rods (405) vertically limited in two guide grooves, the upper ends of the two second electric telescopic rods (405) are respectively fixedly connected to the cross beam (404), and the lower ends of the two second electric telescopic rods (405) are respectively rotatably connected to the upper roller (401); The table plate (101) is also processed with an inwardly concave mounting groove, and the lower roller (402) is rotatably mounted in the mounting groove, with the top end protruding upwardly from the mounting groove.

10. The wood-plastic formwork flattening machine according to claim 9, characterized in that: The leveling device (4) further comprises a third driving mechanism, which comprises: Two connecting blocks (406) connected to the bottom ends of the two second electric telescopic rods (405), and a third motor (407) connected to one of the connecting blocks (406), wherein the driving end of the third motor (407) is connected to the upper roller (401); The bottom of the guide groove of the support (403) close to the third motor (407) passes through the support (403) so as to allow the third motor (407) to slide up and down and thereby limit and guide the movement of the third motor (407).

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