CN118905869A - Full-automatic double-head vertical grinding machine - Google Patents

Abstract

The present invention discloses a fully automatic double-head vertical grinder, including a workbench and a clamping assembly, a driving assembly is symmetrically arranged on one side surface of the workbench, a grinding assembly is arranged on the outside of the driving assembly, the grinding assembly includes a fixed frame and a grinding motor, a polygonal support frame is arranged below the fixed frame, each side of the support frame has an inclination angle, and the inclination angle is 45°, two groups of nozzles are symmetrically fixedly installed on the outer surface of the support frame, one group of nozzles is a common nozzle, which can spray high-pressure water columns, and the other group of nozzles is an atomizing nozzle, which can spray water mist, and a water dividing frame is fixedly installed on the upper surface of the fixed frame, and the two groups of nozzles are connected to the water dividing frame through a plurality of hoses, and each group of hoses is connected to a side area in the water dividing frame. In the present invention, the coolant is processed by the atomizing nozzle, which can increase the contact area with the air and improve the evaporation rate, thereby taking away heat more effectively and quickly.

Description

A fully automatic double-head vertical grinder

Technical Field

The invention belongs to the technical field of vertical grinders, and in particular relates to a full-automatic double-head vertical grinder.

Background Art

A grinder is a machine tool that uses abrasive tools to grind the surface of a workpiece. Most grinders use high-speed rotating grinding wheels for grinding, while a few use other grinding tools such as oilstones and abrasive belts and free abrasives for processing, such as honing machines, superfinishing machines, belt grinders, grinders and polishers. A grinder with a vertical workbench is referred to as a vertical grinder. Most vertical grinders in the prior art use a setting method in which one grinding head corresponds to one workbench, which makes it impossible to achieve simultaneous processing of multiple angles on a part, and step-by-step processing will lead to complex processing steps and reduced processing accuracy.

In the prior art, such as Chinese patent publication number: CN113977423A, the disclosed CNC vertical double-grinding-head multifunctional grinding machine includes a base and a column arranged on the base, a workbench assembly for placing the parts to be processed is arranged on the base and located on one side of the column, a driving mechanism is installed on the column, a grinding head mounting assembly for mounting the grinding head is connected to the driving mechanism, at least two grinding head mounting assemblies are provided, and the mounting directions of at least two grinding head mounting assemblies are not parallel to each other.

The above-mentioned grinding machine has the following deficiencies:

1. The above device lacks cooling of the workpiece during grinding, which will lead to poor grinding effect of the workpiece;

2. In the process of grinding the workpiece in the above device, the lack of cooling of the grinding wheel will cause the temperature of the grinding wheel to be too high, thereby reducing the service life of the grinding wheel.

Summary of the invention

In order to overcome the deficiencies of the prior art, the present invention provides a fully automatic double-head vertical grinder, which can provide a better cooling treatment for the workpiece and the grinding wheel during the grinding process, thereby effectively improving the grinding effect.

In order to achieve the above-mentioned object, the present invention provides the following technical solution: a fully automatic double-head vertical grinder, comprising a workbench and a clamping assembly, a driving assembly is symmetrically arranged on one side surface of the workbench, a grinding assembly is arranged on the outer side of the driving assembly,

The grinding assembly includes a fixed frame and a grinding motor.

A polygonal support frame is arranged below the fixed frame, each side of the support frame has an inclination angle of 45°, and two groups of nozzles are symmetrically fixedly installed on the outer surface of the support frame, one group of nozzles is a common nozzle that can spray high-pressure water columns, and the other group of nozzles is an atomizing nozzle that can spray water mist.

A water-dividing frame is fixedly mounted on the upper surface of the fixed frame. The two groups of nozzles are connected to the water-dividing frame via a plurality of hoses, and each group of hoses is connected to a side area in the water-dividing frame.

Optionally, a solenoid valve 1 connected to the interior is fixedly provided on the upper surface of the water diversion frame, and a partition plate is symmetrically fixedly provided in the water diversion frame, and the inner cavity of the water diversion frame is divided into three areas by the two partition plates. A solenoid valve 2 is symmetrically provided in the middle area, and one end of the solenoid valve 2 is connected to the drainage end of the solenoid valve 1, and the other end passes through the partition plate and is connected to one side area.

Optionally, a collecting groove is provided on the surface of the workbench away from the driving component, a slide rail is fixedly installed in the collecting groove, a plurality of drainage grooves are provided on the bottom surface of the slide rail, a slider is slidably arranged in the slide rail, and an electric rotating base that has been waterproofed is fixedly installed on the upper surface of the slider.

Optionally, the driving assembly includes a support frame fixedly mounted on the surface of the workbench, a lead screw 2 is rotatably arranged in the support frame, a slider 2 is threadedly arranged on the surface of the lead screw 2, a rotating base 2 is fixedly mounted on the outer side surface of the slider 2, a telescopic cylinder 1 is fixedly mounted on the outer side surface of the rotating part of the rotating base 2, and the fixed frame is fixed to the outer end surface of the piston rod of the telescopic cylinder 1.

Optionally, the grinding motor is fixedly installed in a fixed frame, and a grinding wheel is fixedly installed on the outer end of the output shaft of the grinding motor, and the water outlet end of the nozzle is facing the direction of the grinding wheel.

Optionally, telescopic cylinders 2 are symmetrically fixedly provided on both sides of the fixed frame, a connecting frame is symmetrically fixedly provided on the upper surface of the support frame, and a piston rod of the telescopic cylinders 2 is fixed to the connecting frame.

Optionally, the clamping assembly includes a placement plate and two groups of symmetrically arranged clamping blocks, the placement plate is fixedly mounted on the upper end surface of a rotating base, the placement plate is provided with a slide groove one and a through groove one, the slide groove one and the through groove one are cross-shaped, and bidirectional screws are rotatably arranged in the slide groove one and the through groove one, the two groups of clamping blocks are respectively threadedly matched with the two bidirectional screws, and respectively slide in the slide groove one and the through groove one.

Optionally, the upper end of the clamping block is U-shaped, and the protrusions on both sides are provided with inclined surfaces. The outer side surface of the upper end of the clamping block is provided with a threaded hole, and the outer side surface of the top block is fixedly provided with a spiral rod that matches the threaded hole.

Optionally, a protective frame is fixedly installed on the upper surface of the workbench, a plurality of groups of fixing rods are fixedly provided on the side of the protective frame, and some of the fixing rods are connected by transparent acrylic plates, and a feed port is opened on one side of the protective frame.

Optionally, rubber plates are symmetrically fixedly installed between two groups of fixed rods corresponding to the two support frames, the rubber plates can be folded, and a connecting plate is fixedly arranged between the two rubber plates. A sealing plate is rotatably arranged inside the connecting plate, and the sealing plate is fixed to the outer surface of the telescopic cylinder and is sealed.

In summary, compared with the prior art, the fully automatic double-head vertical grinder provided by the present invention has the following beneficial effects:

1. In the present invention, the coolant is processed through an atomizing nozzle, which can increase the contact area with the air and improve the evaporation rate, so as to take away the heat more effectively and quickly, avoid overheating of the polishing surface, affect the polishing effect of the workpiece surface, and take away the heat in time, and also avoid deformation or damage of the workpiece due to excessive temperature. At the same time, the use of an atomizing nozzle can also effectively save the amount of coolant used in the polishing process;

2. In the present invention, after the workpiece is polished, the second solenoid valve on one side with the atomizing nozzle is closed, and the second solenoid valve on the other side is opened. At this time, the coolant will be sprayed through the ordinary nozzle, and at this time, it will be sprayed in the form of a high-pressure water column to wash the metal debris on the surface of the workpiece, saving the subsequent cleaning process;

3. In the present invention, the cooperation of the clamping block and the square top block facilitates the clamping and fixing of the circular workpiece and the square workpiece.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the overall structure of the present invention;

Fig. 2 is a partial structural schematic diagram of the present invention;

FIG3 is a structural schematic diagram 1 of a clamping assembly of the present invention;

FIG4 is a cross-sectional view of a clamping assembly of the present invention;

FIG5 is an enlarged view of the details of point A in FIG4 of the present invention;

FIG6 is a structural schematic diagram 1 of a grinding assembly in the present invention;

FIG7 is a second structural schematic diagram of the grinding assembly in the present invention;

FIG8 is a cross-sectional view of a grinding assembly according to the present invention;

FIG9 is a second schematic diagram of the overall structure of the present invention;

FIG10 is a cross-sectional view of the present invention;

FIG11 is an enlarged view of the detail of point B in FIG10 of the present invention;

In the figure: 1, workbench; 2, drive assembly; 3, grinding assembly; 4, clamping assembly; 11, collecting tank; 12, slide rail; 13, slider 1; 14, lead screw 1; 141, motor 1; 15, rotating base 1; 21, support frame; 22, lead screw 2; 221, motor 2; 23, slider 2; 24, rotating base 2; 25, telescopic cylinder 1; 31, fixed frame; 32, water distribution frame; 321, solenoid valve 1; 322, partition plate; 323, solenoid valve 2; 33, support frame; 331 , nozzle; 332, hose; 333, connecting frame; 34, telescopic cylinder two; 35, grinding motor; 351, grinding wheel; 41, placement plate; 411, slide slot one; 412, through slot one; 42, bidirectional screw; 43, motor frame; 431, motor three; 44, clamping block; 441, threaded hole; 45, top block; 451, screw rod; 5, workpiece; 6, protection frame; 61, feed port; 62, fixing rod; 63, baffle; 64, rubber plate; 641, connecting plate; 642, sealing plate.

DETAILED DESCRIPTION

In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

Embodiment 1:

Referring to Figures 1-2, a fully automatic double-head vertical grinder includes a workbench 1, a driving component 2 is symmetrically arranged on one side surface of the workbench 1, a grinding component 3 is arranged on the outer side of the driving component 2, the driving component 2 and the grinding component 3 are used in conjunction with each other, and the grinding component 3 on one side is used for rough grinding the surface of the workpiece 5, and the grinding component 3 on the other side is used for fine grinding the surface of the workpiece 5.

Referring to Figures 1-2, a collecting groove 11 is provided on the surface of the workbench 1 away from the driving component 2, and the collecting groove 11 is used to collect used coolant and grinding debris. A slide rail 12 is fixedly installed in the collecting groove 11, and a plurality of drainage grooves are provided on the bottom surface of the slide rail 12. A slider 13 is slidably arranged in the slide rail 12, and an electric rotating base 15 that has been waterproofed is fixedly installed on the upper surface of the slider 13. A clamping component 4 is installed on the upper surface of the rotating part of the rotating base 15, and the clamping component 4 can clamp square and round workpieces 5 from the side.

Specifically, the rotating base 15 is a prior art, which can drive the clamping assembly 4 to rotate, thereby enabling the grinding assembly 3 to perform better grinding processing on the surface of the workpiece 5.

Referring to Figures 1-2, the driving component 2 includes a support frame 21 fixedly mounted on the surface of the workbench 1, a lead screw 22 is rotatably arranged in the support frame 21, and limit shafts fixed to the support frame 21 are symmetrically arranged on both sides of the lead screw 22, a slider 23 is threadedly arranged on the surface of the lead screw 22, wherein the limit shaft penetrates the slider 23 and slides together to ensure the stability of the slider 23 when it moves up and down, a motor 141 is fixedly arranged on the upper surface of the support frame 21, and the output shaft of the motor 221 is fixed to the upper end of the lead screw 22, and the lead screw 22 is driven to rotate by the motor 221, thereby driving the slider 23 to move up and down.

Referring to Figure 1-2, a rotating base 24 is fixedly installed on the outer side surface of the slider 23, and a telescopic cylinder 25 is fixedly installed on the outer side surface of the rotating part of the rotating base 24. The grinding assembly 3 is installed on the piston rod of the telescopic cylinder 25. Through the lifting and lowering movement of the slider 23, the grinding assembly 3 is driven to approach the processing surface of the workpiece 5, and then the grinding assembly 3 is driven by the telescopic cylinder 25 to adjust the position of the grinding assembly 3, and then the surface of the workpiece 5 is polished.

6-8, the grinding assembly 3 includes a fixed frame 31 and a grinding motor 35. The fixed frame 31 is fixed to the outer end surface of the piston rod of the telescopic cylinder 25. The grinding motor 35 is fixedly installed in the fixed frame 31, and a grinding wheel 351 is fixedly installed at the outer end of the output shaft of the grinding motor 35.

Referring to Figures 6-8, a polygonal support frame 33 is arranged below the fixed frame 31, and each surface of the support frame 33 has an inclination angle, and the inclination angle is 45°. Two groups of nozzles 331 are symmetrically fixedly installed on the outer surface of the support frame 33. One group of nozzles 331 are ordinary nozzles 331, which can spray high-pressure water columns, and the other group of nozzles 331 are atomizing nozzles 331, which can spray water mist. The water outlet ends of the nozzles 331 are all facing the direction of the grinding wheel 351, and because the surface of the support frame 33 has an inclination angle of 45°, the coolant mist sprayed by the atomizing nozzle 331 can better contact the grinding wheel 351 and the grinding surface of the workpiece 5.

Specifically, processing the coolant through the atomizing nozzle 331 can increase the contact area with the air and increase the evaporation rate, thereby removing heat more effectively and quickly, avoiding overheating of the polishing surface, affecting the polishing effect of the workpiece 5 surface, and removing the heat in time, and can also prevent the workpiece 5 from being deformed or damaged due to excessive temperature. At the same time, the use of the atomizing nozzle 331 can also effectively save the amount of coolant used in the polishing process.

Referring to Figures 6-8, telescopic cylinders 34 are symmetrically fixed on both sides of the fixed frame 31, and connecting frames 333 are symmetrically fixed on the upper surface of the support frame 33. The piston rod of the telescopic cylinder 34 is fixed to the connecting frame 333. The height of the nozzle 331 is regulated by driving the connecting frame 333 to rise and fall through the telescopic cylinder 34, so that the nozzle 331 can better spray coolant on the workpiece 5 and the grinding wheel 351.

6-8, a water distribution frame 32 is fixedly installed on the upper surface of the fixed frame 31, and a solenoid valve 321 communicating with the interior is fixedly arranged on the upper surface of the water distribution frame 32, and the water inlet end of the solenoid valve 321 can be connected to an external coolant water pipe.

Partition plates 322 are symmetrically fixedly arranged in the water-dividing frame 32, and the inner cavity of the water-dividing frame 32 is divided into three areas by these two partition plates. Solenoid valve 2 323 is symmetrically arranged in the middle area. One end of the solenoid valve 2 323 is connected to the drainage end of the solenoid valve 1 321, and the other end passes through the partition plate 322 and is connected to one side area. The external coolant is regulated to enter the water-dividing frame 32 through the solenoid valve 1 321, and then the coolant is regulated to enter the two side areas through the solenoid valve 2 323 on both sides.

6-8 , the two groups of nozzles 331 are connected to the water diversion frame 32 via a plurality of hoses 332 , and each group of hoses 332 is connected to a side area in the water diversion frame 32 .

Specifically, when the surface of the workpiece 5 is polished, the solenoid valve 1 321 is opened, and the solenoid valve 2 323 on the side with the atomizing nozzle 331 is selected to be opened. At this time, the coolant enters the atomizing nozzle 331 through the solenoid valve 1 321, the solenoid valve 2 323 and the hose 332, and then the coolant is atomized by the atomizing nozzle 331 and then sprayed out.

Furthermore, after the workpiece 5 is polished, the solenoid valve 323 on one side with the atomizing nozzle 331 is closed, and the solenoid valve 323 on the other side is opened. At this time, the coolant will be sprayed out through the ordinary nozzle 331, and will be sprayed out in the form of a high-pressure water column to flush the metal debris on the surface of the workpiece 5.

3-5, the clamping assembly 4 includes a placement plate 41 and two groups of symmetrically arranged clamping blocks 44. The placement plate 41 is fixedly installed on the upper end surface of the rotating base 15. The placement plate 41 is provided with a slide groove 411 and a through groove 412. The slide groove 411 and the through groove 412 are arranged in a cross shape, and a bidirectional screw 42 is rotatably arranged in the slide groove 411 and the through groove 412. A motor frame 43 is fixedly installed at a position on the outer side surface of the placement plate 41 corresponding to the bidirectional screw 42. The motor frame 43 has a waterproof effect. A motor 431 whose output shaft is fixed to one end of the bidirectional screw 42 is fixedly installed inside the motor frame 43, and the motor 431 has a self-locking effect and is used to drive the bidirectional screw 42 to rotate.

Specifically, the lower sides of the through groove 412 are connected to the outside, so that the coolant falling into the slide groove 411 can be discharged, and the inner bottom surface of the slide groove 411 is set as an inclined surface to facilitate the discharge of the coolant with metal debris.

3-5, two sets of clamping blocks 44 are respectively threadedly matched with two bidirectional screws 42, and slide in the slide groove 411 and the through groove 412 respectively. The rotation of the bidirectional screw 42 drives the clamping blocks 44 on both sides to move, so as to clamp the workpiece 5 placed on the surface of the placement plate 41.

3-5 , the upper end of the clamping block 44 is U-shaped, and the protrusions on both sides are provided with inclined surfaces, so that the clamping block 44 can clamp and fix the circular workpiece 5 conveniently. A square top block 45 is slidably provided in the groove at the upper end of the clamping block 44, and the top block 45 is used to clamp the square workpiece 5.

3-5, a threaded hole 441 is provided on the outer side surface of the upper end of the clamping block 44, and a spiral rod 451 matching the threaded hole 441 is fixedly provided on the outer side surface of the top block 45. The spiral rod 451 is turned to slide the top block 45 out of the groove of the clamping block 44, so that the side of the square workpiece 5 can be better clamped and fixed.

Embodiment 2:

9-11 , based on the first embodiment, in order to avoid splashing of coolant and metal debris during the grinding process, a protective frame 6 may be fixedly installed on the upper surface of the workbench 1 .

9-11 , a plurality of sets of fixing rods 62 are fixedly provided on the side of the protection frame 6 , and a part of the fixing rods 62 are connected by transparent acrylic plates to facilitate observation of the grinding of the internal workpiece 5 by the outside world. A feed port 61 is provided on one side of the protection frame 6 .

Referring to Figures 9-11, rubber plates 64 are symmetrically fixedly installed between two groups of fixed rods 62 corresponding to the two support frames 21, and the rubber plates 64 can be folded. A connecting plate 641 is fixedly arranged between the two rubber plates 64, and a sealing plate 642 is rotatably arranged inside the connecting plate 641. The sealing plate 642 is fixed to the outer surface of the telescopic cylinder 25 and is sealed so as not to hinder the lifting and rotation of the telescopic cylinder 25 and at the same time prevent the internal coolant and metal debris from splashing.

For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criteria for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve the technical problem within a certain error range and basically achieve the technical effect.

It should be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a product or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such product or system. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the product or system including the elements.

The above description shows and describes several preferred embodiments of the present application, but as mentioned above, it should be understood that the present application is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the application concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not deviate from the spirit and scope of the present application, and should be within the scope of protection of the claims attached to the present application.

Claims (10)

1. The full-automatic double-head vertical grinder is characterized by comprising a workbench (1) and a clamping assembly (4), wherein a driving assembly (2) is symmetrically arranged on one side surface of the workbench (1), a polishing assembly (3) is arranged on the outer side of the driving assembly (2),

The polishing assembly (3) comprises a fixed frame (31) and a polishing motor (35),

A polygonal supporting frame (33) is arranged below the fixed frame (31), each surface of the supporting frame (33) is provided with an inclined angle which is 45 degrees, two groups of spray heads (331) are symmetrically and fixedly arranged on the outer surface of the supporting frame (33), one group of spray heads (331) is a common spray head (331) and can spray high-pressure water columns, the other group of spray heads (331) is an atomizing spray head (331) and can spray water mist,

The upper surface fixed mounting of fixed frame (31) has water diversion frame (32), two sets of shower nozzle (331) are connected through a plurality of hose (332) between water diversion frame (32) to every hose (332) all can communicate with the one side region in water diversion frame (32).

2. The full-automatic double-head vertical grinding machine according to claim 1, wherein the upper surface of the water diversion frame (32) is fixedly provided with a first electromagnetic valve (321) communicated with the inside, the inside of the water diversion frame (32) is symmetrically and fixedly provided with a partition plate (322), the inner cavity of the water diversion frame (32) is divided into three areas by the two partition plates, the middle area is symmetrically provided with a second electromagnetic valve (323), one end of the second electromagnetic valve (323) is communicated with the water draining end of the first electromagnetic valve (321), and the other end of the second electromagnetic valve is communicated with one side area through the partition plate (322).

3. The full-automatic double-head vertical grinding machine according to claim 1, wherein a collecting groove (11) is formed in the surface, far away from the driving assembly (2), of the workbench (1), a sliding rail (12) is fixedly installed in the collecting groove (11), a plurality of drainage through grooves are formed in the bottom surface of the sliding rail (12), a first sliding block (13) is slidably arranged in the sliding rail (12), and an electric rotating base (15) subjected to waterproof treatment is fixedly installed on the upper surface of the first sliding block (13).

4. The full-automatic double-head vertical grinding machine according to claim 1, wherein the driving assembly (2) comprises a supporting frame (21) fixedly installed on the surface of the workbench (1), a screw rod II (22) is rotationally arranged on the supporting frame (21), a slide block II (23) is arranged on the surface of the screw rod II (22) in a threaded manner, a rotating base II (24) is fixedly installed on the outer side surface of the slide block II (23), a telescopic cylinder I (25) is fixedly installed on the outer side surface of a rotating part in the rotating base II (24), and the fixing frame (31) is fixed on the outer end surface of a piston rod of the telescopic cylinder I (25).

5. The full-automatic double-head vertical grinding machine according to claim 1, wherein the grinding motor (35) is fixedly arranged in the fixed frame (31), the grinding wheel (351) is fixedly arranged at the outer end of an output shaft of the grinding motor (35), and the water outlet ends of the spray heads (331) face the direction of the grinding wheel (351).

6. The full-automatic double-head vertical grinder according to claim 1, wherein the two sides of the fixed frame (31) are symmetrically and fixedly provided with a telescopic cylinder two (34), the upper surface of the supporting frame (33) is symmetrically and fixedly provided with a connecting frame (333), and a piston rod of the telescopic cylinder two (34) is fixed with the connecting frame (333).

7. The full-automatic double-head vertical grinding machine according to claim 1, wherein the clamping assembly (4) comprises a placing plate (41) and two groups of clamping blocks (44) which are symmetrically arranged, the placing plate (41) is fixedly arranged on the upper end face of the rotating base I (15), the placing plate (41) is provided with a chute I (411) and a through groove I (412), the chute I (411) and the through groove I (412) are arranged in a cross shape, the two groups of clamping blocks (44) are respectively in threaded fit with the two groups of clamping blocks (42) in a rotating manner, and the two groups of clamping blocks respectively slide in the chute I (411) and the through groove I (412).

8. The full-automatic double-head vertical grinder according to claim 7, wherein the upper end of the clamping block (44) is provided with a U-shaped structure, the lugs on two sides are provided with inclined planes, the outer side surface of the upper end of the clamping block (44) is provided with a threaded hole (441), and the outer side surface of the top block (45) is fixedly provided with a screw rod (451) matched with the threaded hole (441).

9. The full-automatic double-head vertical grinding machine according to claim 1, wherein a protective frame (6) is fixedly arranged on the upper surface of the workbench (1), a plurality of groups of fixing rods (62) are fixedly arranged on the side face of the protective frame (6), a part of fixing rods (62) are connected by using a transparent acrylic plate, and a feed inlet (61) is formed in one side of the protective frame (6).

10. The full-automatic double-head vertical grinder according to claim 9, wherein rubber plates (64) are symmetrically and fixedly installed between two groups of fixing rods (62) corresponding to the two supporting frames (21), the rubber plates (64) can be folded, a connecting plate (641) is fixedly arranged between the two rubber plates (64), a sealing plate (642) is rotatably arranged in the connecting plate (641), and the sealing plate (642) is fixed with the outer surface of the telescopic cylinder one (25) and is subjected to sealing treatment.