A suction device for a blister machine

Abstract

The present invention provides an air suction device for a blister machine, belonging to the technical field of mechanical equipment. It solves the problem that the air suction device of the existing blister machine has poor stability due to the movement of the air suction pipe in two directions. The air suction device of the blister machine comprises a frame and a guide rail arranged on the frame, the air suction device comprises an air suction pipe and a driving member, the air suction device also comprises a slide seat slidably arranged on the guide rail, a guide hole and an air suction hole connected to the guide hole are provided on the slide seat, the air suction pipe is slidably arranged in the guide hole, the driving member is arranged on the slide seat and can drive the air suction pipe to extend and retract, an air hole is provided on the air suction pipe, and when the air suction pipe is extended outward, the air hole can be connected with the air suction hole, and when the air suction pipe is retracted inward, the air hole and / or the air suction hole can be blocked. The air suction device of the blister machine has good stability.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical equipment and relates to an air suction device of a vacuum forming machine. Background Art

[0002] The blister machine, also known as the thermoplastic forming machine, is a machine that blister-forms heated and plasticized thermoplastic plastic coils such as PVC, PE, PP, PET, HIPS, etc. into packaging boxes, frames and other products of various shapes. It uses the vacuum suction force generated by a vacuum pump to blister-form the heated and softened thermoplastic plastic sheets into vacuum covers, blister trays, bubble shells and the like in various shapes through a mold. Therefore, the blister machine at least includes a mold and a suction component that can suck air into the inner cavity of the mold.

[0003] As disclosed in the patent document (application number: 201811145094.6), the circulating blister mechanism includes a conveying blister workbench and a sliding vacuum suction device. A plurality of circulating plates are laid on the conveying chain of the conveying blister workbench. The circulating plate includes a template with an inner cavity. A suction pipe connected to the inner cavity is also provided on the template. The sliding vacuum suction device includes a slide rail. A cylinder is provided at one end of the slide rail. A suction butt pipe is provided on the piston rod of the cylinder. The air inlet of the suction butt pipe is connected to the vacuum suction pump through a hose and a solenoid valve. When the suction pipe on the template is opposite to the suction butt pipe, the cylinder drives the suction butt pipe to extend and dock with the suction pipe, and the solenoid valve controls the vacuum suction pump to suction the inner cavity of the template.

[0004] The above structure has many defects, such as: 1. Since the cylinder needs to move with the template during the suction process, the suction butt joint needs to drag the hose connected to the vacuum suction pump. Correspondingly, the hose will generate a reverse drag force on the suction butt joint, which will cause the suction butt joint to rotate circumferentially. At the same time, the suction butt joint is prone to unilateral wear and deformation due to frequent radial force on the suction butt joint, resulting in poor stability of the suction butt joint and inaccurate docking with the suction pipe; 2. In order to stop suction when the suction butt joint is separated from the suction pipe and avoid wasting the vacuum of the vacuum suction pump, an independent solenoid valve needs to be set to control the on-off of the air path; 3. The hose is connected to the side wall of the suction butt joint, so the aperture of the hose must be smaller than the aperture of the suction butt joint. When the aperture of the suction butt joint is fixed, the hose with a smaller aperture will limit the flow and affect the suction efficiency. Summary of the invention

[0005] The purpose of the present invention is to solve the problem of poor stability caused by the movement of the suction pipe in two directions in the suction device of the existing blister machine in view of the above problems in the existing technology, and to propose an air suction device for a blister machine.

[0006] The objective of the present invention can be achieved through the following technical scheme: a suction device of a blister forming machine, the blister forming machine comprises a frame and a guide rail arranged on the frame, the suction device comprises a suction pipe and a driving member, and is characterized in that the suction device also comprises a slide seat slidably arranged on the guide rail, the slide seat is provided with a guide hole and an exhaust hole connected with the guide hole, the suction pipe is slidably passed through the guide hole, the driving member is arranged on the slide seat and can drive the suction pipe to extend and retract, the suction pipe is provided with an air hole, and when the suction pipe is extended outward, the air hole can be connected with the exhaust hole, and when the suction pipe is retracted inward, the air hole and / or the exhaust hole can be blocked.

[0007] The frame of the blister forming machine is also provided with a plurality of molds in a cyclic moving process, and the molds are all provided with connecting pipes. The suction device is used to connect with the connecting pipes of the molds in the moving process and suck air into the inner cavity of the mold to realize blister forming. For this purpose, the present application provides a slide seat, which is slidably connected to the slide rail to realize movement in one direction. The driving member is fixed on the slide seat and drives the suction pipe to retract and extend to realize movement in another direction. That is, when the mold moves to the point where the connecting pipe is opposite to the suction pipe, the driving member drives the suction pipe to extend and form a sleeve connection with the connecting pipe, and then the mold moves with the slide seat through the connecting pipe and the suction pipe. During the movement, the suction device sucks air into the inner cavity of the mold. Specifically, an air suction hole is provided on the slide seat, which is a hose for connecting an external vacuum air source. The suction pipe is in a state of retracting the slide seat, and the air suction hole and the air through hole are blocked. When the mold is aligned with the suction pipe, the driving member drives the suction pipe to extend and connect with the mold. At this time, the air suction hole is connected with the air through hole. In the process that the slide seat moves with the mold, the external vacuum air source passes through the air suction hole and the air through hole. The hole sucks air into the suction pipe, thereby realizing suction of the inner cavity of the mold, wherein, during the movement, the dragging force of the hose of the external vacuum air source is applied to the slide, and the slide is constrained by the guide rail, so the dragging force can be eliminated, and it will not affect the extension and contraction and stability of the suction pipe, avoiding the rotation of the suction pipe due to lateral drag and excessive wear on one side, ensuring the accuracy of the extension and contraction position of the suction pipe and the stability of the docking with the connecting pipe on the mold, when the driving member drives the suction pipe to retract, the air hole or the air extraction hole can be blocked to achieve mechanical blocking, and there is no need to block the air path with an electromagnetic valve, so there is no need to install an electromagnetic valve, reducing the use of electronic control components, reducing costs, and further improving stability, and at the same time, unlike the existing external vacuum air source hose directly connected to the suction pipe, because the hose diameter needs to be smaller than the suction pipe diameter, resulting in the suction pipe flow being limited by the hose, the present application opens an air extraction hole for the hose connected to the external vacuum air source on the slide, so that a hose with a larger diameter can be connected, thereby avoiding flow limitation and improving suction efficiency.

[0008] In the suction device of the above-mentioned vacuum forming machine, a suction cavity located inside the slide is formed between the suction pipe and the slide. When the suction pipe is extended outward, both the suction hole and the air hole can be connected to the suction cavity. When the suction pipe is retracted inward, the air hole or the suction hole can be disconnected from the suction cavity and blocked. The suction cavity has a large passing area. When the suction pipe is extended, the suction hole and the air hole only need to be connected to the suction cavity. There is no need for the suction hole and the air hole to be precisely docked, which reduces the requirements for the matching accuracy of the slide and the suction pipe, and avoids the restriction of gas flow due to the incomplete alignment of the suction hole and the air hole.

[0009] In the suction device of the above-mentioned vacuum forming machine, the aperture of the guide hole is larger than the outer diameter of the suction pipe, and sliding sleeves are provided at both ends of the guide hole. The suction pipe passes through the two sliding sleeves, and the above-mentioned suction cavity is formed between the end faces of the two sliding sleeves. The sliding sleeve is fixed to the sliding seat or the sliding sleeve is fixed to the suction pipe. By making the aperture of the guide hole larger than the outer diameter of the suction pipe, a gap is formed between the two, and then the two ends are blocked by two sliding sleeves to form the suction cavity, the processing technology is simpler, and the coaxiality between the suction pipe and the guide hole is guaranteed, so that the width of the suction cavity is circumferentially uniform.

[0010] In the suction device of the above-mentioned vacuum forming machine, the two sliding sleeves are fixed to the sliding seat, the suction pipe and the two sliding sleeves are slidably matched, the air extraction hole is connected to the suction cavity, the air hole is arranged on the side wall of the suction pipe, and when the suction pipe is extended outward, the air hole can be connected to the suction cavity, and when the suction pipe is retracted inward, the air hole is blocked by the inner circumference of one of the sliding sleeves. The suction pipe and the sliding sleeve are slidably matched, so it is only necessary to perform a heat process on the suction pipe and ensure the smoothness of its outer wall, thereby ensuring the air tightness between the inner circumference of the sliding sleeve and the outer circumference of the suction pipe. There is no need to perform a heat process on the sliding seat, and the cost is low. When the suction pipe is retracted, the air hole is blocked by the sliding sleeve, which is equivalent to the sliding seat blocking the hose of the external vacuum air source, and there is no need to set a solenoid valve to achieve on-off control of the air path.

[0011] In the suction device of the above-mentioned vacuum forming machine, the two sliding sleeves are fixed to the suction pipe, and the two sliding sleeves are slidably connected in the guide hole. The air hole is opened on the side wall of the suction pipe and is connected to the suction cavity. When the suction pipe is extended outward, the suction hole can be connected to the suction cavity. When the suction pipe is retracted inward, the suction hole is blocked by the outer peripheral surface of one of the sliding sleeves. This structure fixes the sliding sleeve to the suction pipe, and the sliding sleeve and the guide sliding of the sliding seat are matched. Therefore, it is necessary to perform a heat process on the guide hole of the sliding seat. It is also an implementable structural design. Similarly, when the suction pipe is extended, the suction hole and the air hole are connected. When the suction pipe is retracted, the sliding sleeve blocks the suction hole, and the air path of the external vacuum gas source is disconnected.

[0012] In the suction device of the above-mentioned vacuum forming machine, the suction hole is opened on the top surface of the slide seat, and when the suction pipe moves outward, the air hole can be opposite to the suction hole. The hose of the external vacuum air source is connected to the top of the slide seat to reduce the influence on the expansion and contraction of the suction pipe. When the suction pipe is extended, the air hole is opposite to the suction hole, so that the suction hole directly generates airflow to the air hole, reducing airflow resistance and improving suction efficiency.

[0013] In the suction device of the above-mentioned vacuum forming machine, the outer end of the suction pipe has a cylindrical connecting pipe part, the inner diameter of which is larger than the inner diameter of the suction pipe, and the inner wall of the connecting pipe part has an annular groove circumferentially, and an annular buffer gasket is clamped in the annular groove, and the buffer gasket is against the end face of the suction pipe. When the suction pipe is extended, the connecting pipe part is sleeved on the connecting pipe of the mold, so that the mold can move with the slide seat, and the end face of the connecting pipe of the mold can abut against the buffer gasket, that is, the sealing of the docking position of the two is achieved to avoid air leakage, and at the same time, a buffer is provided for the suction pipe to avoid hard collision, ensure the stability of the suction pipe, and reduce the requirements for the accuracy of the moving stroke of the suction pipe.

[0014] In the suction device of the above-mentioned vacuum forming machine, the two ends of the guide hole respectively penetrate the two end surfaces of the slide seat, and the driving member includes a driving cylinder, which is fixed to the end of the slide seat and blocks one end of the guide hole, and the piston rod of the driving cylinder extends into the guide hole and is fixedly connected to the inner end of the suction pipe. The driving cylinder blocks the end of the guide hole to prevent air leakage, and the suction pipe is driven to extend and retract by the driving cylinder, so the stroke accuracy is higher.

[0015] In the suction device of the above-mentioned vacuum forming machine, the inner wall of the inner end opening of the suction pipe is provided with a connecting convex edge in the circumferential direction, the end surface of the piston rod of the driving cylinder is provided with a screw hole in the axial direction, a locking bolt is passed through the connecting convex edge, and the locking bolt is screwed into the screw hole of the piston rod of the driving cylinder, and the locking bolt blocks the inner hole of the connecting convex edge. While the suction pipe is connected to the piston rod of the driving cylinder, the inner end of the suction pipe is blocked to prevent air leakage in the suction pipe.

[0016] In the suction device of the above-mentioned vacuum forming machine, an adjustment pad is fixed on the end surface of the slide seat, and a avoidance hole is opened on the adjustment pad, and the avoidance hole is relatively communicated with the guide hole. The driving cylinder is fixed on the adjustment pad to block the avoidance hole, and the piston rod of the driving cylinder passes through the avoidance hole. By replacing the adjustment pad with different thicknesses, the position of the driving cylinder can be adjusted, and then the position of the connecting pipe when the suction pipe is extended can be adjusted without changing the driving cylinder, so as to be suitable for different molds.

[0017] Compared with the prior art, the suction device of the blister machine has the following advantages:

[0018] 1. Since the dragging force of the hose of the external vacuum air source is applied to the slide during movement, and the slide is constrained by the guide rail, the dragging force can be eliminated and will not affect the expansion and contraction and stability of the suction pipe, thus avoiding the rotation of the suction pipe due to lateral drag and excessive wear on one side, ensuring the accuracy of the expansion and contraction position of the suction pipe and the stability of the docking with the connecting pipe on the mold.

[0019] 2. When the driving member drives the suction pipe to retract, the air hole or the exhaust hole can be blocked to achieve mechanical blocking. There is no need to install a solenoid valve to block the air path. Therefore, there is no need to install a solenoid valve, reducing the use of electronic control components, which not only reduces costs but also further improves stability.

[0020] 3. Since an air extraction hole for connecting a hose to an external vacuum air source is provided on the slide seat, a hose with a larger diameter can be connected, thereby avoiding flow restriction and improving air suction efficiency.

[0021] 4. Since an air suction cavity is formed between the air suction pipe and the sliding seat, when the air suction pipe is extended, the air suction hole and the air through hole only need to be connected to the air suction cavity, and there is no need for the air suction hole and the air through hole to be precisely docked, which reduces the requirements for the matching accuracy of the sliding seat and the air suction pipe, and at the same time avoids the restriction of gas flow caused by the incomplete alignment of the air suction hole and the air through hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional structural diagram of a blister machine.

[0023] Figure 2 yes Figure 1 A magnified view of the structure at center.

[0024] Figure 3 It is a three-dimensional structural schematic diagram of the air suction device.

[0025] Figure 4 It is a structural cross-sectional view of the suction pipe of the suction device when it is retracted.

[0026] Figure 5 It is a structural cross-sectional view of the suction device when the suction pipe is extended.

[0027] Figure 6 It is a structural cross-sectional view of the air intake pipe of the air intake device in the second embodiment when it is retracted.

[0028] Figure 7 It is a structural cross-sectional view of the air intake pipe of the air intake device in the second embodiment when it is extended.

[0029] Figure 8 It is a structural cross-sectional view of the suction pipe of the suction device in Example 3 when it is retracted.

[0030] Fig. 9It is a structural cross-sectional view of the air intake pipe of the air intake device in the third embodiment when it is extended.

[0031] Fig.10 It is a structural cross-sectional view of the air intake pipe of the air intake device in the fourth embodiment when it is retracted.

[0032] Fig.11 It is a structural cross-sectional view of the air intake pipe of the air intake device in the fourth embodiment when it is extended.

[0033] In the figure, 1, frame; 11, guide rail; 12, conveyor chain; 13, reset cylinder; 2, mold; 21, connecting pipe; 3, slide seat; 31, guide hole; 32, exhaust hole; 33, suction cavity; 34, slider; 4, suction pipe; 41, air hole; 42, connecting pipe; 421, annular groove; 43, buffer gasket; 44, connecting convex edge; 5, sliding sleeve; 6, driving cylinder; 61, screw hole; 7, adjustment pad; 71, avoidance hole; 8, locking bolt. DETAILED DESCRIPTION

[0034] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0035] Embodiment 1:

[0036] like Figure 1 As shown, a vacuum device of a vacuum forming machine, the vacuum forming machine comprises a frame 1, a conveying chain 12 is arranged on the frame 1, a plurality of molds 2 are connected to the conveying chain 12, the plurality of molds 2 are arranged in sequence and circulate with the conveying chain 12, when the mold 2 moves upward, the opening of the mold 2 faces upward, and a connecting pipe 21 is provided on the side of the mold 2 for connecting the vacuum device, and the vacuum device can vacuum the inner cavity of the mold 2 to realize vacuum forming. Figure 2 , Figure 3 As shown, a guide rail 11 is also fixed on the frame 1, and the guide rail 11 is arranged along the moving direction of the mold 2. The suction device includes a slide 3, a suction pipe 4 and a driving cylinder 6. The slide 3 is in a rectangular block shape, and a slider 34 is fixed on the bottom surface of the slide 3. The slider 34 is slidably connected to the guide rail 11. A guide hole 31 is opened on the slide 3, and the axial direction of the guide hole 31 is perpendicular to the guide rail 11. The suction pipe 4 is slidably inserted in the guide hole 31, and the outer end of the suction pipe 4 extends out of the guide hole 31 and faces the mold 2. The driving cylinder 6 is fixed to the other end of the slide 3.

[0037] Combination Figure 4 , Figure 5As shown, the aperture of the guide hole 31 is larger than the outer diameter of the suction pipe 4, and sliding sleeves 5 are fixed at both ends of the guide hole 31. The suction pipe 4 is slidably inserted into the two sliding sleeves 5, and the outer peripheral wall of the suction pipe 4 is slidably guided with the inner peripheral wall of the sliding sleeve 5 to form a suction cavity 33 between the two sliding sleeves 5. An air extraction hole 32 is provided on the top surface of the slide seat 3, and the inner end of the air extraction hole 32 passes through the guide hole 31 and is connected to the suction cavity 33. The air extraction hole 32 is used to connect a hose of an external vacuum air source. The external vacuum air source can be a conventional device such as a vacuum pump. An air through hole 41 is provided on the side wall of the suction pipe 4. There are two air through holes 41, one facing upward and the other facing downward. It has a connecting flange 44, and an adjusting pad 7 is fixed at the end of the slide 3 away from the mold 2. The adjusting pad 7 is fixed by bolt locking, and an avoidance hole 71 is opened on the adjusting pad 7. The avoidance hole 71 is coaxially arranged with the guide hole 31. The driving cylinder 6 is fixed on the adjusting pad 7 and blocks the avoidance hole 71. The piston rod of the driving cylinder 6 passes through the avoidance hole 71 and docks with the end of the suction pipe 4. A screw hole 61 is opened on the end face of the piston rod of the driving cylinder 6. A locking bolt 8 passes through the inner hole of the connecting flange 44 and is screwed into the screw hole 61 of the piston rod, so as to realize the fixed connection between the suction pipe 4 and the piston rod of the driving cylinder 6. At the same time, the locking bolt 8 blocks the inner hole of the connecting flange 44. The outer end of the air intake pipe 4 has a cylindrical connecting portion 42, which is located outside the slide 3. The inner diameter of the connecting portion 42 is larger than the inner diameter of the air intake pipe 4. The outer end opening edge of the connecting portion 42 has a chamfered bevel in the circumferential direction, thereby forming a flared shape. The inner wall of the connecting portion 42 has an annular groove 421 in the circumferential direction. An annular buffer gasket 43 is clamped in the annular groove 421. The buffer gasket 43 is made of rubber material and is attached to the end face of the air intake pipe 4. The driving cylinder 6 can drive the air intake pipe 4 to extend and retract. When the driving cylinder 6 drives the air intake pipe 4 to extend outward, the air hole 41 moves into the air intake cavity 33 and communicates with the air intake cavity 33, and the upward air hole 41 is opposite to the air extraction hole 32. When the driving cylinder 6 drives the air intake pipe 4 to retract inward, the air hole 41 moves into the sliding sleeve 5 and is blocked by the inner circumferential surface of the sliding sleeve 5.

[0038] During operation, the mold 2 moves to the point where the connecting pipe 21 is opposite to the connecting pipe portion 42, and the driving cylinder 6 drives the suction pipe 4 to extend. The connecting pipe portion 42 of the suction pipe 4 can be sleeved on the end of the connecting pipe 21, and the end of the connecting pipe 21 abuts against the buffer gasket 43 to achieve a seal between the two. At the same time, the mold 2 moves with the slide 3, and the suction pipe 4 is extended while the air hole 41 is connected with the suction cavity 33. During the movement, the external vacuum air source sucks air into the inner cavity of the mold 2 through the air extraction hole 32, the suction cavity 33, the air hole 41 and the suction pipe 4. After the vacuum molding is completed, the driving cylinder 6 drives the suction pipe 4 to retract, and the suction pipe 4 is separated from the connecting pipe 21, and the slide 3 stops moving. A reset cylinder 13 is fixed to the end of the guide rail 11, and the reset cylinder 13 can push the slide 3 to reset it. After the suction pipe 4 is retracted, the air hole 41 enters the sleeve 5 and is blocked by the inner wall of the sleeve 5.

[0039] Embodiment 2:

[0040] The suction device of the blister machine is basically the same as that of the first embodiment, except that Figure 6 , Figure 7 As shown, the two sliding sleeves 5 are fixed to the intake pipe 4, and the two sliding sleeves 5 are slidably connected in the guide hole 31, and a sliding guide fit is formed between the outer peripheral walls of the two sliding sleeves 5 and the hole walls of the guide hole 31. The air hole 41 is opened on the side wall of the intake pipe 4 and is always connected with the intake cavity 33. When the driving cylinder 6 drives the intake pipe 4 to extend outward, the intake cavity 33 is connected with the exhaust hole 32. When the driving cylinder 6 drives the intake pipe 4 to retract inward, the outer peripheral wall of the sliding sleeve 5 blocks the exhaust hole 32.

[0041] Embodiment three:

[0042] The suction device of the blister machine is basically the same as that of the first embodiment, except that Figure 8 , Fig. 9 As shown, the suction device does not include the sliding sleeve 5, but directly cooperates the suction pipe 4 with the guide hole 31, that is, the outer wall of the suction pipe 4 is slidably guided with the hole wall of the guide hole 31, and a groove is circumferentially opened on the outer wall of the suction pipe 4 to form a suction cavity 33, and the air hole 41 is directly connected with the suction cavity 33. When the driving cylinder 6 drives the suction pipe 4 to extend outward, the suction cavity 33 is connected with the exhaust hole 32. When the driving cylinder 6 drives the suction pipe 4 to retract inward, the outer wall of the suction pipe 4 blocks the exhaust hole 32.

[0043] Embodiment 4:

[0044] The suction device of the blister machine is basically the same as that of the third embodiment, except that Fig.10 , Fig.11As shown, the suction device does not include the suction chamber 33, and only an air hole 41 is opened on the suction pipe 4. When the driving cylinder 6 drives the suction pipe 4 to extend outward, the air hole 41 is opposite to and connected with the exhaust hole 32. When the driving cylinder 6 drives the suction pipe 4 to retract inward, the air hole 41 is staggered with the exhaust hole 32, that is, the wall of the guide hole 31 blocks the air hole 41, and the outer wall of the suction pipe 4 blocks the exhaust hole 32.

[0045] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0046] Although the terms such as frame 1, guide rail 11, conveyor chain 12 are used more frequently in this article, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. An air suction device for a blister forming machine, the blister forming machine comprising a frame (1) and a guide rail (11) arranged on the frame (1), the air suction device comprising an air suction pipe (4) and a driving member, characterized in that: The air suction device also includes a slide seat (3) slidably arranged on the guide rail (11), the slide seat (3) is provided with a guide hole (31) and an air suction hole (32) connected to the guide hole (31), the air suction pipe (4) is slidably arranged in the guide hole (31), the driving member is arranged on the slide seat (3) and can drive the air suction pipe (4) to extend and retract, the air suction pipe (4) is provided with an air hole (41), and when the air suction pipe (4) extends outward, the air hole (41) can be connected with the air suction hole (32), and when the air suction pipe (4) retracts inward, the air hole (41) and / or the air suction hole (32) can be blocked.

2. The suction device of the blister machine according to claim 1, characterized in that: An air suction cavity (33) located inside the slide seat (3) is formed between the air suction pipe (4) and the slide seat (3); when the air suction pipe (4) is extended outward, the air extraction hole (32) and the air passage hole (41) can be connected to the air suction cavity (33); when the air suction pipe (4) is retracted inward, the air passage hole (41) or the air suction hole (32) can be disconnected from the air suction cavity (33) and blocked.

3. The suction device of the blister machine according to claim 2, characterized in that: The diameter of the guide hole (31) is larger than the outer diameter of the air intake pipe (4). Sliding sleeves (5) are provided at both ends of the guide hole (31). The air intake pipe (4) passes through the two sliding sleeves (5). The air intake cavity (33) is formed between the end surfaces of the two sliding sleeves (5). The sliding sleeve (5) is fixed to the sliding seat (3) or the sliding sleeve (5) is fixed to the air intake pipe (4).

4. The suction device of the blister machine according to claim 3, characterized in that: The two sliding sleeves (5) are both fixed to the sliding seat (3), the air intake pipe (4) and the two sliding sleeves (5) are slidably matched, the air extraction hole (32) is connected to the air intake cavity (33), the air passage hole (41) is opened on the side wall of the air intake pipe (4), and when the air intake pipe (4) is extended outward, the air passage hole (41) can be connected to the air intake cavity (33), and when the air intake pipe (4) is retracted inward, the air passage hole (41) is blocked by the inner circumference of one of the sliding sleeves (5).

5. The suction device of the blister machine according to claim 3, characterized in that: The two sliding sleeves (5) are both fixed to the air intake pipe (4), and the two sliding sleeves (5) are slidably connected in the guide hole (31). The air hole (41) is opened on the side wall of the air intake pipe (4) and is connected to the air intake cavity (33). When the air intake pipe (4) extends outward, the air extraction hole (32) can be connected to the air intake cavity (33). When the air intake pipe (4) retracts inward, the air extraction hole (32) is blocked by the outer peripheral surface of one of the sliding sleeves (5).

6. The suction device of the blister machine according to any one of claims 1 to 5, characterized in that: The air extraction hole (32) is formed on the top surface of the slide seat (3), and when the air suction pipe (4) moves outward, the air passage hole (41) can be opposite to the air extraction hole (32).

7. The suction device of the blister machine according to any one of claims 1 to 5, characterized in that: The outer end of the air intake pipe (4) has a cylindrical connecting portion (42), the inner diameter of which is larger than the inner diameter of the air intake pipe (4), and the inner wall of the connecting portion (42) has an annular groove (421) circumferentially, an annular buffer gasket (43) is clamped in the annular groove (421), and the buffer gasket (43) is in contact with the end face of the air intake pipe (4).

8. The suction device of the blister machine according to any one of claims 1 to 5, characterized in that: The two ends of the guide hole (31) respectively penetrate the two end surfaces of the slide seat (3); the driving member comprises a driving cylinder (6) which is fixed to the end of the slide seat (3) and blocks one end of the guide hole (31); a piston rod of the driving cylinder (6) extends into the guide hole (31) and is fixedly connected to the inner end of the suction pipe (4).

9. The suction device of the blister machine according to claim 8, characterized in that: The inner wall of the inner end opening of the suction pipe (4) is circumferentially provided with a connecting protrusion (44); the end surface of the piston rod of the driving cylinder (6) is axially provided with a screw hole (61); a locking bolt (8) is passed through the connecting protrusion (44), and the locking bolt (8) is screwed into the screw hole (61) of the piston rod of the driving cylinder (6); the locking bolt (8) blocks the inner hole of the connecting protrusion (44).

10. The suction device of the blister machine according to claim 8, characterized in that: An adjusting pad (7) is fixed on the end surface of the slide seat (3), and a avoidance hole (71) is provided on the adjusting pad (7). The avoidance hole (71) is relatively communicated with the guide hole (31). The driving cylinder (6) is fixed on the adjusting pad (7) and blocks the avoidance hole (71), and the piston rod of the driving cylinder (6) passes through the avoidance hole (71).

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