Gland mechanism and gland method for dustproof cover of closed plastic drum

Abstract

The application provides a capping mechanism and a capping method for a dustproof cover of a closed plastic bucket, and the capping mechanism comprises: a lifting device and a centering and clamping device, the centering and clamping device is installed at the bottom of the lifting device; a flat pushing mechanism, the flat pushing mechanism is installed at the bottom of the centering and clamping device and located at the side of the centering and clamping device; a cover taking and positioning platform for placing a dustproof cover to be installed; the lifting device drives the centering and clamping device to move up and down relative to the plastic bucket, so that the center of the centering and clamping device is aligned with the bucket opening of the plastic bucket, and the dustproof cover is installed on the bucket opening of the plastic bucket by the flat pushing mechanism. The flat pushing mechanism with a swash plate can scrape the cover buckled on the bucket opening from one side to the other side, and smoothly realizes the capping action, and the cover is smoothly buckled to the outer edge of the bucket opening. The problems of cover edge curling and unsuccessful capping are effectively solved, and the smooth progress of the capping process is ensured. The equipment downtime is reduced, manual intervention is reduced, and the production efficiency of the equipment is improved.

Description

Technical Field

[0001] This invention relates to the field of liquid material packaging in the chemical industry, and particularly to a capping mechanism and method for dustproof caps on closed plastic drums. Background Technology

[0002] Currently in the industrial sector, the automated packaging process for liquid products often uses closed plastic containers that meet the requirements of the national standard GB / T18191. After the container lid is tightened, there is usually an additional need for a plastic dust cover.

[0003] The capping method currently used by most companies is usually manual capping.

[0004] Because plastic buckets manufactured using the vacuum forming process currently on the market come in a wide variety of sizes and types with significant shape variations, their dust caps are typically made of plastic. Round caps with handles for tearing the lid are considered irregularly shaped caps, and they often suffer from problems such as soft material, inconsistent dimensions, and irregular bucket opening shapes.

[0005] This structure easily leads to low reliability and success rate during automated capping, and is very prone to problems such as cap edge curling, cap deformation, and caps not being fully inserted into the bottle opening. Currently, there are virtually no mature and reliable fully automatic plastic capping mechanisms of this type on the market.

[0006] Therefore, solving the capping reliability problem of automatic dust cap pressing in such packaging applications is a key aspect of realizing automated liquid packaging.

[0007] In view of this, the inventors of this application have designed a capping mechanism and capping method for a dust cover for a closed plastic bucket, in order to overcome the above-mentioned technical problems. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to overcome the defects of the existing plastic bucket through-hole capping method, which is manual capping, has low reliability and low success rate, and is prone to causing the cap edge to curl and the cap to deform. The present invention provides a capping mechanism and capping method for dust cover of closed plastic bucket.

[0009] The present invention solves the above-mentioned technical problems through the following technical solution:

[0010] A capping mechanism for a dustproof cap on a closed plastic bucket, characterized in that the capping mechanism comprises:

[0011] A lifting device and a centering clamping device, wherein the centering clamping device is installed at the bottom of the lifting device;

[0012] A horizontal pushing mechanism is installed at the bottom of the centering clamping device and located on the side of the centering clamping device;

[0013] The dust cover positioning platform is used to place the dust cover to be installed;

[0014] The lifting device drives the centering clamping device to move up and down relative to the plastic bucket, so that the center of the centering clamping device is aligned with the opening of the plastic bucket, and the flat pushing mechanism installs the dust cover onto the opening of the plastic bucket.

[0015] According to one embodiment of the present invention, the pushing mechanism includes a base plate, a first cylinder, a flat plate, a first linear guide rail, an inclined plate, and a vacuum suction cup, wherein the first linear guide rail is mounted on the flat plate, and the base plate is mounted on the first linear guide rail;

[0016] One end of the first cylinder is mounted on the base plate, and the other end is connected to the flat plate. The inclined plate is fixed on the flat plate, and the vacuum suction cup is installed in the middle of the inclined plate. The extension and retraction of the first cylinder enables the inclined plate to move left and right along the first linear guide rail.

[0017] According to one embodiment of the present invention, the centering clamping device includes a top plate, a floating centering ball head, a plurality of connecting rods, a connecting rod, a drive plate, a second cylinder, a fixing plate and a gripper. The floating centering ball head is installed below the conical hole of the top plate, and the connecting rod is fixed to the floating centering ball head by means of bolt washers passing through the hole of the top plate to form a structural support for the lower part.

[0018] The connecting rod is connected to the drive plate by a pin, the second cylinder is mounted on the fixed plate, the fixed plate is fixed to the vertical connecting rod by a nut, and the gripper is connected to the connecting rod and the base plate by a pin to form a connecting rod mechanism.

[0019] According to one embodiment of the present invention, the lifting device includes a back plate, a second linear guide rail, a third cylinder and a connecting frame, wherein the second linear guide rail is mounted on the back plate;

[0020] One end of the connecting frame is connected to the drive shaft of the third cylinder, and the other end is connected to the centering clamping device.

[0021] According to one embodiment of the present invention, the cover removal positioning platform includes an inclined plate, a limiting screw, and a limiting baffle. The limiting baffle is installed on both sides of the inclined plate, the limiting screw is installed on the limiting baffle, and the dust cover is buffered on the inclined plate.

[0022] According to one embodiment of the present invention, the centering clamping device includes two opposing jaws.

[0023] The present invention also provides a capping method for a dust cover for a closed-top plastic bucket, characterized in that the capping method employs a capping mechanism for a dust cover for a closed-top plastic bucket as described above, and the capping method includes the following steps:

[0024] S1. The capping mechanism moves above the cap removal and positioning platform;

[0025] S2. The lifting device descends to the cover-removing positioning platform, the flat pushing mechanism sucks up the dust cover, and the lifting device lifts up to suck the dust cover onto the cover-pressing mechanism.

[0026] S3. The lifting device descends, the horizontal pushing mechanism lowers the dust cover until it contacts the barrel opening, and the centering clamping device descends to both sides of the barrel opening to tightly hold the barrel opening.

[0027] S4. When the dust cover descends to the mouth of the bucket, it is fastened to the edge of the mouth of the bucket by 3-5mm. The dust cover is in an inclined state, with the left side close to the mouth of the bucket and the right side higher than the mouth of the bucket. The flat pushing mechanism pushes it out to the right, and the dust cover is fastened and completely flattened.

[0028] S5. The centering clamping device is released, and the lifting device is lifted away from the barrel opening, completing the capping process.

[0029] According to an embodiment of the present invention, step S2 further includes: activating the negative pressure system to generate negative pressure in the vacuum suction cup, the lifting device descending to the cover positioning platform, the vacuum suction cup contacting the dust cover and sucking the dust cover in place;

[0030] The lifting device lifts the dust cover and picks it up onto the capping mechanism. The capping mechanism moves to directly above the opening of the plastic bucket, aligning the center of the centering clamping device with the opening of the bucket.

[0031] According to an embodiment of the present invention, step S3 further includes: the lifting device descends, the inclined vacuum suction cup together with the dust cover descends to the barrel opening and contacts the barrel opening, and the clamps of the centering clamping device descend together to both sides of the barrel opening;

[0032] When the second cylinder of the centering clamping device is activated, the gripper retracts under the action of the second cylinder and the connecting rod, and the gripper tightly holds the mouth of the barrel. Under the locking of the centering clamping device, the capping mechanism completes the positioning and fixing of the barrel mouth at the mouth.

[0033] According to an embodiment of the present invention, step S4 further includes: closing the negative pressure of the vacuum suction cup and activating the first cylinder of the pushing mechanism, wherein the first cylinder retracts and the tilted vacuum suction cup is pushed out to the right;

[0034] After the dust cover moves a certain distance, it stops. Under the combined force of the friction and squeezing force of the vacuum suction cup, the dust cover deforms and snaps down.

[0035] After the first cylinder is fully retracted, the tilted vacuum suction cup scrapes over the entire dust cover and the mouth of the barrel, and the dust cover is completely flattened, so that the entire dust cover is flatly attached to the outer edge of the mouth of the barrel.

[0036] The positive and progressive effects of this invention are as follows:

[0037] The capping mechanism and capping method for dustproof caps on closed plastic buckets of the present invention have the following advantages:

[0038] 1. Employing a sliding mechanism with a slant plate: This mechanism smoothly slides the lid, with its opening at the barrel mouth, from one side to the other, achieving a seamless capping action. The lid fits smoothly onto the outer edge of the barrel mouth. This effectively solves problems such as lid curling and unsuccessful capping, ensuring a smooth capping process. It reduces equipment downtime, minimizes manual intervention, and improves equipment production efficiency.

[0039] 2. The negative pressure suction cup device is adopted: the structure is simple and reliable, the number of parts is small, and the manufacturing is simple. During the entire process of picking up and placing the cap, the cap can be effectively adsorbed on the inclined plate, ensuring that the cap will not fall off after leaving the cap picking and positioning platform.

[0040] 3. The floating clamping device for the bucket opening is adopted: This ensures that the dust cover can still be effectively positioned and accurately clamped onto the bucket opening even with large deviations. Attached Figure Description

[0041] The above and other features, properties and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings and embodiments, in which the same reference numerals always denote the same features, wherein:

[0042] Figure 1 This is a schematic diagram of the capping mechanism for the dust cover of a closed plastic bucket according to the present invention.

[0043] Figure 2 This is a schematic diagram of the flat-pushing mechanism in the capping mechanism of the dustproof cap for closed plastic buckets of the present invention.

[0044] Figure 3 This is a schematic diagram of the centering clamping mechanism in the capping mechanism of the dustproof capping device for closed plastic buckets of the present invention.

[0045] Figure 4 This is a schematic diagram of the lifting device in the capping mechanism of the dustproof cap for closed plastic buckets of the present invention.

[0046] Figure 5 This is a schematic diagram of the cap-removing positioning platform in the capping mechanism of the dustproof cap for closed plastic buckets according to the present invention.

[0047] Figure 6 This is a schematic diagram showing the capping mechanism of the dust cover for a closed plastic bucket of the present invention moving to the position directly above the opening of the plastic bucket.

[0048] Figure 7 for Figure 6 Enlarged view of part A in the middle.

[0049] Figure 8 This is a schematic diagram showing the dust cover being fastened to the mouth of the bucket when the flat-push mechanism completes the capping process of the dust cover pressing mechanism of the present invention for a closed plastic bucket. Detailed Implementation

[0050] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0051] Embodiments of the invention will now be described in detail with reference to the accompanying drawings. Preferred embodiments of the invention will now be described in detail, examples of which are shown in the drawings. Wherever possible, the same reference numerals will be used in all the drawings to denote the same or similar parts.

[0052] Furthermore, although the terminology used in this invention is selected from commonly known and used terms, some terms mentioned in this specification may have been selected by the applicant in his or her judgment, and their detailed meanings are explained in the relevant sections of the description herein.

[0053] Furthermore, the invention should be understood not only through the actual terminology used, but also through the meaning implied by each term.

[0054] like Figures 1 to 8 As shown, this invention discloses a capping mechanism for a dust cover on a closed plastic bucket, comprising: a lifting device 100, a centering clamping device 200, a horizontal pushing mechanism 300, and a cap-removing positioning platform 400. The centering clamping device 200 is installed at the bottom of the lifting device 100, and the horizontal pushing mechanism 300 is installed at the bottom of the centering clamping device 200, located on the side of the centering clamping device 200. The cap-removing positioning platform 400 is used to hold the dust cover 500 to be installed.

[0055] When the lifting device 100 drives the centering clamping device 200 to move up and down relative to the plastic bucket 600, the center of the centering clamping device 200 is aligned with the opening 610 of the plastic bucket 600, and the flat pushing mechanism 300 installs the dust cover 500 onto the opening 610 of the plastic bucket 600.

[0056] Preferably, the pushing mechanism 300 includes a base plate 310, a first cylinder 320, a flat plate 330, a first linear guide rail 340, an inclined plate 350, and a vacuum suction cup 360. The first linear guide rail 340 is mounted on the flat plate 330, and the base plate 310 is mounted on the first linear guide rail 340. One end of the first cylinder 320 is mounted on the base plate 310, and the other end is connected to the flat plate 330. The inclined plate 350 is fixed on the flat plate 330, and the vacuum suction cup 360 is installed in the middle of the inclined plate 350. The extension and retraction of the first cylinder 320 enables the inclined plate 350 to move left and right along the first linear guide rail 340.

[0057] Preferably, the centering clamping device 200 includes a top plate 210, a floating centering ball head 220, multiple connecting rods 230, a connecting rod 240, a drive plate 250, a second cylinder 260, a fixing plate 270, and grippers 280. The floating centering ball head 220 is installed below the conical hole of the top plate 210, and the connecting rods 230 are fixed to the floating centering ball head 220 through the holes of the top plate 210 by bolts and washers, forming structural support for the lower part. When the lower component is under force, the connecting rod 240 can move up, down, left, and right within a small range, and the floating centering ball head 220 is aligned with the conical hole to achieve a certain centering and correction function.

[0058] The connecting rod 240 is connected to the drive plate 250 via a pin. The second cylinder 260 is mounted on the fixed plate 270, which is fixed to the vertical connecting rod 290 via a nut. The centering clamping device 200 preferably includes two opposing grippers 280. The two grippers 280 are connected to the connecting rod 240 and the base plate 310 via pins to form a linkage mechanism. The centering clamping device 200 moves by lifting the drive cylinder, which in turn moves the connecting rod 240 and drives the grippers 280 to achieve opening and clamping actions.

[0059] More preferably, the lifting device 100 includes a back plate 110, a second linear guide rail 120, a third cylinder 130, and a connecting frame 140. The second linear guide rail 120 is mounted on the back plate 110. One end of the connecting frame 140 is connected to the drive shaft of the third cylinder 130, and the other end is connected to the centering clamping device 200. By driving the third cylinder 130 to lift, the entire assembly can move up and down.

[0060] Furthermore, the cover-removing positioning platform 400 includes an inclined plate 410, a limiting screw 420, and a limiting baffle 430. The limiting baffle 430 is installed on both sides of the inclined plate 410, the limiting screw 420 is installed on the limiting baffle 430, and the dust cover 500 is buffered on the inclined plate 410. The limiting baffle 430 and the limiting screw 420 perform preliminary positioning of the dust cover 500.

[0061] The present invention also provides a capping method for a dust cover for a closed-top plastic bucket, which employs the capping mechanism for a dust cover for a closed-top plastic bucket as described above, and the capping method includes the following steps:

[0062] S1. The capping mechanism moves above the cap removal positioning platform.

[0063] S2. The lifting device descends to the cover-removing positioning platform, the flat pushing mechanism sucks up the dust cover, and the lifting device lifts up to suck the dust cover onto the cover-pressing mechanism.

[0064] Preferably, step S2 further includes: activating the negative pressure system to generate negative pressure in the vacuum suction cup, the lifting device descending to the cover-removing positioning platform, the vacuum suction cup contacting the dust cover and sucking it in;

[0065] The lifting device lifts the dust cover and picks it up onto the capping mechanism. The capping mechanism moves to directly above the opening of the plastic bucket, aligning the center of the centering clamping device with the opening of the bucket.

[0066] S3. The lifting device descends, the flat pushing mechanism lowers the dust cover until it contacts the barrel opening, and the centering clamping device descends to both sides of the barrel opening to tightly hold the barrel opening.

[0067] Preferably, step S3 further includes: the lifting device descends, the inclined vacuum suction cup and the dust cover descend together to the barrel opening and contact the barrel opening, and the clamps of the centering clamping device descend together to both sides of the barrel opening;

[0068] The second cylinder of the centering clamping device operates, causing the grippers to retract under the action of the second cylinder and connecting rod, tightly gripping the barrel opening. The inner side of the lower end of the grippers is machined into a circle or V-shape. The two grippers clamp synchronously to form an automatic centering capability, making the center line of the clamping mechanism coaxial with the axis of the barrel opening. Under the locking of the centering clamping device, the capping mechanism completes the positioning and fixing of the barrel opening at the opening.

[0069] S4. When the dust cover descends to the mouth of the bucket, it is fastened to the edge of the mouth of the bucket by 3-5mm. The dust cover is in an inclined state, with the left side close to the mouth of the bucket and the right side higher than the mouth of the bucket. The flat pushing mechanism pushes it out to the right, and the dust cover is fastened and completely flattened.

[0070] Due to the 300-stroke design of the flat-push cylinder, when the dust cover 500 descends to the barrel opening 610, it just covers the edge of the barrel opening by about 3-5mm. The cover is in an inclined position, with the left side close to the barrel opening and the right side higher than the barrel opening.

[0071] Preferably, step S4 further includes: shutting off the negative pressure of the vacuum suction cup and activating the first cylinder of the flat pushing mechanism, the first cylinder retracting, and the tilted vacuum suction cup being pushed out to the right.

[0072] After the dust cover moves a certain distance and stops, it deforms and buckles under the combined force of friction and compression from the vacuum suction cup.

[0073] Specifically, since the left side of the opening of the bucket is already hooked, the dust cover will not slide along with the tilted vacuum suction cup. Instead, it will move slightly horizontally a few millimeters and then stop. Under the combined force of friction and pressure from the tilted vacuum suction cup, the cover will deform slightly and close down.

[0074] When the first cylinder of the flat-pushing mechanism is fully retracted, the lowest point of the inclined plate scrapes across the entire dust cover and the opening of the bucket, completely flattening the dust cover. The four barbs inside the dust cover then hook onto the rim of the bucket, finally securing the entire dust cover flat against the outer edge of the bucket opening. The dust cover is scraped by the lowest point of the inclined plate, not by the vacuum suction cup. The main component of the flat-scraping action is the inclined plate, while the vacuum suction cup moves with the inclined plate. The vacuum suction cup is primarily used to pick up and place the dust cover.

[0075] S5. The centering clamping device is released, and the lifting device is lifted away from the barrel opening, completing the capping process.

[0076] Based on the above structural description, the present invention provides a capping mechanism and capping method for dustproof caps on closed plastic buckets. Addressing various defects that are prone to occur in the capping process during the above packaging process, the capping mechanism and capping method achieve a reliable capping action flow. This structure is simple and reliable, with a compact layout, low cost, and convenient maintenance.

[0077] In summary, the capping mechanism and capping method for dustproof caps of closed plastic buckets of the present invention have the following advantages:

[0078] 1. Employing a sliding mechanism with a slant plate: The lid, positioned at the barrel opening, is smoothly pushed from one side to the other, achieving a seamless capping action. The lid is smoothly secured to the outer edge of the barrel opening. This effectively solves problems such as lid curling and unsuccessful capping, ensuring a smooth capping process. It reduces equipment downtime, minimizes manual intervention, and improves equipment production efficiency.

[0079] 2. The negative pressure suction cup device is adopted: the structure is simple and reliable, the number of parts is small, and the manufacturing is simple. During the entire process of picking up and placing the cap, the cap can be effectively adsorbed on the inclined plate, ensuring that the cap will not fall off after leaving the cap picking and positioning platform.

[0080] 3. The floating clamping device for the bucket opening is adopted: This ensures that the dust cover can still be effectively positioned and accurately clamped onto the bucket opening even with large deviations.

[0081] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A capping mechanism for a dust cap of a closed plastic bucket, characterized in that, The capping mechanism comprises: a lifting device and a centering and clamping device mounted at the bottom of the lifting device; a horizontal pushing mechanism mounted at the bottom of the centering and clamping device and located at the side of the centering and clamping device; a cap taking and positioning platform for placing the dustproof cap to be installed; the lifting device drives the centering and clamping device to move up and down relative to the plastic barrel, so that the center of the centering and clamping device is aligned with the barrel opening of the plastic barrel, and the dustproof cap is installed on the barrel opening of the plastic barrel by the horizontal pushing mechanism; the horizontal pushing mechanism comprises a bottom plate, a first air cylinder, a flat plate, a first linear guide rail, an inclined plate and a vacuum suction cup, the first linear guide rail is mounted on the flat plate, and the bottom plate is mounted on the first linear guide rail; one end of the first air cylinder is mounted on the bottom plate, the other end is connected with the flat plate, the inclined plate is fixed on the flat plate, the vacuum suction cup is mounted in the middle of the inclined plate, and the first air cylinder is retracted to realize the left and right movement of the inclined plate along the first linear guide rail.

2. The capping mechanism for dust cover of closed plastic drum as claimed in claim 1 wherein, the centering and clamping device comprises a top plate, a floating centering ball head, a plurality of connecting rods, a connecting rod, a driving plate, a second air cylinder, a fixed plate and a clamping jaw, the floating centering ball head is mounted below the tapered hole of the top plate, the connecting rod is fixed on the floating centering ball head through bolt gasket passing through the hole of the top plate to form a structural support for the lower part; the connecting rod and the driving plate are connected through a pin shaft, the second air cylinder is mounted on the fixed plate, the fixed plate is fixed with the vertical connecting rod through a nut, and the clamping jaw is connected with the connecting rod and the bottom plate through a pin shaft to form a connecting rod mechanism.

3. The capping mechanism for dust cover of closed plastic drum as claimed in claim 2 wherein, the lifting device comprises a back plate, a second linear guide rail, a third air cylinder and a connecting frame, and the second linear guide rail is mounted on the back plate; one end of the connecting frame is connected with the driving shaft of the third air cylinder, and the other end is connected with the centering and clamping device.

4. The capping mechanism for dust cover of closed plastic drum as claimed in claim 3 wherein, the cap taking and positioning platform comprises an inclined plate, a limiting screw and a limiting baffle, the limiting baffle is mounted on both sides of the inclined plate, the limiting screw is mounted on the limiting baffle, and the dustproof cap is buffered on the inclined plate.

5. The capping mechanism for dust cover of closed plastic drum as claimed in claim 4 wherein, the centering and clamping device comprises two oppositely arranged clamping jaws.

6. A capping method for a dust cap of a closed plastic bucket, characterized by, The capping method adopts the capping mechanism for dustproof cap of closed plastic barrel according to claim 4 or 5, and comprises the following steps: S1, the capping mechanism moves above the cap taking and positioning platform; S2, the lifting device is lowered to the cap taking and positioning platform, the horizontal pushing mechanism sucks the dustproof cap, the lifting device is lifted, and the dustproof cap is sucked to the capping mechanism; S3, the lifting device is lowered, the horizontal pushing mechanism lowers the dustproof cap to the barrel opening to contact with the barrel opening, the centering and clamping device is lowered to the both sides of the barrel opening to tightly hold the barrel opening; S4, when the dustproof cap is lowered to the barrel opening, it is buckled to the barrel opening edge by 3-5mm, the dustproof cap is in an inclined state, the left side is close to the barrel opening, and the right side is higher than the barrel opening, the horizontal pushing mechanism is pushed to the right side, the dustproof cap is buckled and completely flattened; S5, the centering and clamping device is loosened, the lifting device is lifted away from the barrel opening, and the capping process is completed.

7. The capping method for dustproof cover of closed plastic drum according to claim 6, characterized in that, The step S2 further comprises: starting the negative pressure system to make the vacuum chuck generate negative pressure, and lowering the lifting device to the cover positioning platform, and making the vacuum chuck contact the dustproof cover to suck the dustproof cover. The lifting device lifts to suck the dustproof cover to the capping mechanism, and the capping mechanism moves to the top of the barrel opening of the plastic barrel to align the center of the centering and clamping device with the barrel opening.

8. The capping method for dustproof cover of closed plastic drum according to claim 6, characterized in that, The step S3 further comprises: lowering the lifting device, and lowering the inclined vacuum chuck together with the dustproof cover to the barrel opening and making the vacuum chuck contact the barrel opening, and lowering the clamping jaw of the centering and clamping device to the two sides of the barrel opening. The second cylinder of the centering and clamping device works, the clamping jaw is contracted under the action of the second cylinder and the connecting rod, the clamping jaw tightly holds the barrel opening, the capping mechanism completes the positioning and fixing of the barrel opening under the locking of the centering and clamping device.

9. The capping method for dustproof lids of closed plastic drums according to claim 6, characterized in that, The step S4 further comprises: closing the negative pressure of the vacuum chuck, and starting the first cylinder of the horizontal pushing mechanism, the first cylinder is contracted, and the inclined vacuum chuck is pushed out to the right side; After the dustproof cover is translated for a distance and stops, the dustproof cover is deformed and buckled under the combined force of the friction and extrusion of the horizontal pushing of the vacuum chuck; When the first cylinder is completely contracted, the inclined vacuum chuck scrapes the entire dustproof cover and the barrel opening, the dustproof cover is completely scraped, and the entire dustproof cover is buckled to the outer edge of the barrel opening.

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