A ferromagnetic impurity removal device on an internal thread forming machine

Abstract

The present invention discloses a ferromagnetic impurity removal device for an internal thread forming machine, comprising a frame and an impurity removal component, wherein the impurity removal component is arranged on the frame; and further comprising an impurity recovery component; the impurity removal component comprises a housing, a mounting frame, and an electromagnet ring, wherein the mounting frame is mounted in the housing, and the electromagnet ring is mounted on the mounting frame, wherein the electromagnet ring is provided with a through hole adapted to the shape of a copper tube, and both sides of the housing are provided with matching holes in a straight line with the through hole, wherein the copper tube can pass through the matching hole on one side of the housing into the housing and then pass through the through hole and out from the matching hole on the other side of the housing; and the impurity recovery component is used to collect ferromagnetic impurities on the electromagnet ring. The present invention uses the impurity removal component, and the electromagnet ring in the impurity removal component can effectively remove ferromagnetic impurities on the copper tube, is simple to operate, conveniently and efficiently absorbs ferromagnetic impurities on the surface of the copper tube, significantly improves the yield rate of internal thread copper tubes, and has practicality.

Description

Technical Field

[0001] The invention relates to the technical field of copper processing, in particular to a ferromagnetic impurity removing device on an internal thread forming machine. Background Art

[0002] During the processing and manufacturing of internally threaded copper tubes, ferromagnetic impurities such as iron, cobalt, and nickel usually adhere to the surface of the raw material tube billet. During the diameter reduction process, these impurities are embedded into the internally threaded copper tube, causing iron damage and scrapping of the product, which seriously affects the yield of the internally threaded copper tube. Therefore, how to remove the ferromagnetic impurities adsorbed on the surface is also a relatively tedious process. The above problems have greatly limited the improvement of the yield rate of internally threaded copper tube products. Summary of the Invention

[0003] The problem to be solved by the present invention is to provide a ferromagnetic impurity removal device on an internal thread forming machine. Through the impurity removal component, the electromagnet ring in the impurity removal component can effectively remove ferromagnetic impurities on the copper tube. The operation is simple, and the ferromagnetic impurities on the surface of the copper tube are conveniently and efficiently adsorbed, which significantly improves the yield rate of the internal thread copper tube and is practical.

[0004] The present invention provides a technical solution to solve the above problems: a ferromagnetic impurity removal device for an internal thread forming machine, comprising a frame and an impurity removal component, wherein the impurity removal component is arranged on the frame; and further comprising an impurity recovery component;

[0005] The impurity removal assembly includes a box, a mounting frame, and an electromagnet ring. The mounting frame is mounted in the box, and the electromagnet ring is mounted on the mounting frame. The electromagnet ring is provided with a through hole that matches the shape of the copper tube. Both sides of the box are provided with matching holes that are in the same straight line as the through hole. The copper tube can pass through the matching hole on one side of the box into the box and then pass through the through hole and out of the matching hole on the other side of the box.

[0006] The impurity recovery component is used to collect ferromagnetic impurities on the electromagnet ring.

[0007] Preferably, it also includes a cleaning component for cleaning ferromagnetic impurities on the electromagnet ring, and the ferromagnetic impurities on the electromagnet ring are cleaned by the cleaning component and then recovered by the impurity recovery component.

[0008] Preferably, the cleaning assembly includes a box cover, a cleaning disc, a cleaning column and a drive motor, the box cover is installed in the box body, the drive motor is installed in the box cover, the cleaning disc is installed at the output end of the drive motor, the cleaning column is installed on the cleaning disc, the cleaning disc is used to clean the surface of the electromagnet ring, the cleaning column is used to clean the inner wall of the through hole, and one end of the box cover is connected to the impurity recovery assembly.

[0009] Preferably, the impurity removal component also includes a transverse moving component and a longitudinal moving component, the longitudinal moving component is installed in the box, the mounting frame is installed on the transverse moving component, the longitudinal moving component is used to drive the mounting frame to move longitudinally, the transverse moving component is installed on the longitudinal moving component, and the transverse moving component is used to drive the mounting frame to move transversely.

[0010] Preferably, the longitudinal moving component includes a moving plate, a stepper motor and a screw rod, the screw rod is threadedly engaged with the moving plate, a guide rail is provided in the box body to cooperate with the moving plate, the stepper motor is installed in the box body, and the output end of the stepper motor is transmission-connected to the screw rod.

[0011] Preferably, the lateral moving component includes a moving plate 2, a stepper motor 2 and a screw rod 2, the screw rod 2 is threadedly engaged with the moving plate 2, the moving plate 1 is provided with a guide rail 2 that cooperates with the moving plate 2, the stepper motor 2 is installed on the moving plate 1, and the output end of the stepper motor 2 is transmission-connected to the screw rod 2.

[0012] Preferably, the impurity recovery component includes a collection barrel and a dust pressing mechanism; the dust pressing mechanism includes a piston head, a pressing rod and a sealing component, the piston head cooperates with the inner ring of the collection barrel, the pressing rod is vertically installed on the piston head, the pressing rod extends out of the collection barrel at one end away from the piston head, and a feed hole is provided on the piston head at a position corresponding to the feed port on the collection barrel, and the sealing component is used to block the feed hole when the piston head runs downward.

[0013] Preferably, the sealing assembly includes a second lower pressure rod and a sealing plate, the first lower pressure rod is provided with a movable hole cooperating with the second lower pressure rod, the movable hole is provided with a vertical groove and a transverse groove, the transverse groove is provided at the upper end of the vertical groove and is connected to each other, the second lower pressure rod is provided with a clamping rod cooperating with the vertical groove and the transverse groove, the sealing plate is provided at the lower end of the second lower pressure rod, when the clamping rod enters the bottom of the transverse groove from the vertical groove, the upper end face of the sealing plate abuts against the lower end face of the feed hole.

[0014] Preferably, the dust pressing mechanism is further provided with a cleaning mechanism for blowing off ferromagnetic impurities and dust on the wall of the collecting barrel.

[0015] Preferably, the cleaning mechanism includes an air source, a vent pipe and several purge heads, the vent pipe is installed inside the lower pressure rod and the piston head, and several purge heads are installed in an inclined annular array at the lower end of the piston head. One end of the vent pipe is connected to the air source, and the other end is connected to the purge head.

[0016] Compared with the existing technology, the advantages of the present invention are: the present invention uses an impurity removal component, and the electromagnet ring in the impurity removal component can effectively remove ferromagnetic impurities on the copper tube. The operation is simple, and the ferromagnetic impurities on the surface of the copper tube are conveniently and efficiently adsorbed, which significantly improves the yield rate of the internal threaded copper tube and is practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 It is a cross-sectional view of the box body of the present invention;

[0020] Figure 3 is a schematic diagram of the cleaning assembly of the present invention;

[0021] Figure 4 is a cross-sectional view of the collection bucket and dust pressing assembly of the present invention;

[0022] Figure 5 yes Figure 3 A magnified schematic diagram of point A in the middle;

[0023] Figure 6 This is a schematic diagram of the dust suppression component after it is pressed down;

[0024] Figure 7 This is a bottom view of the piston head;

[0025] Figure 8 Schematic diagram of the push rod 1.

[0026] The accompanying drawings are marked: 1. Frame, 2. Box body, 3. Force rod, 4. Lower pressure rod 2, 5. Lower pressure rod 1, 6. Collecting bucket, 7. Screw rod 1, 8. Moving plate 1, 9. Mounting frame, 10. Upper cover, 11. Driving motor, 12. Piston head, 13. Filter screen, 14. Sealing plate, 15. Horizontal slot, 16. Vertical slot, 17. Clamping rod, 18. Feed hole, 19. Purge head, 20. Ventilation pipe, 21. Feed port, 22. Cleaning port, 23. Box cover, 24. Electromagnetic ring, 25. Stepper motor 1, 26. Moving plate 2, 27. Stepper motor 2, 28. Screw rod 2, 29. Matching hole, 30. Through hole, 31. Cleaning column, 32. Cleaning disc, 33. Negative pressure fan. DETAILED DESCRIPTION

[0027] The following will describe the embodiments of the present invention in detail with reference to the accompanying drawings and examples, so that the implementation process of how the present invention applies technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0028] In the description of the present invention, it should be noted that, for directional words, such as the terms "center", "horizontal", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and so on, indicating directions and positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and cannot be understood as limiting the specific scope of protection of the present invention.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Therefore, the terms "first" and "second" may explicitly or implicitly refer to one or more of these features. Throughout the description of the present invention, "several" means two or more, unless otherwise specifically defined.

[0030] In the present invention, unless otherwise specified or limited, the terms "assemble," "connect," and "connect" should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integral connection; mechanical connection; direct connection, connection through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0031] It will be understood that when used in this specification and the appended claims, the terms “comprises” and “comprising” indicate the presence of described features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0032] It should also be understood that the terms used in this description of the embodiments of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the embodiments of the present invention. As used in the description of the embodiments of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0033] As shown in the accompanying drawings, a specific embodiment of the present invention is a ferromagnetic impurity removal device for an internal thread forming machine, comprising a frame 1 and an impurity removal component, wherein the impurity removal component is arranged on the frame 1; and further comprising an impurity recovery component;

[0034] The impurity removal assembly includes a box body 2, a mounting frame 9, and an electromagnet ring 24. The mounting frame 9 is mounted in the box body 2, and the electromagnet ring 24 is mounted on the mounting frame 9. The electromagnet ring 24 is provided with a through hole 30 that matches the shape of the copper tube. Both sides of the box body 2 are provided with matching holes 29 that are in the same straight line as the through hole 30. The copper tube can pass through the matching hole 29 on one side of the box body 2 to enter the box body 2 and then pass through the through hole 30 and out of the matching hole 29 on the other side of the box body 2.

[0035] The impurity recovery component is used to collect ferromagnetic impurities on the electromagnet ring 24.

[0036] In this embodiment, a cleaning component for cleaning ferromagnetic impurities on the electromagnet ring 24 is also included. The ferromagnetic impurities on the electromagnet ring 24 are cleaned by the cleaning component and then recovered by the impurity recovery component. Specifically, the cleaning component includes a box cover 23, a cleaning disc 32, a cleaning column 31 and a drive motor 11. The box cover 23 is installed in the box body 2, the drive motor 11 is installed in the box cover 23, the cleaning disc 32 is installed at the output end of the drive motor 11, the cleaning column 31 is installed on the cleaning disc 32, the cleaning disc 32 is used to clean the surface of the electromagnet ring 24, the cleaning column 31 is used to clean the inner wall of the through hole 30, and one end of the box cover 23 is connected to the impurity recovery component.

[0037] The impurity removal assembly further includes a transverse movement assembly and a longitudinal movement assembly. The longitudinal movement assembly is mounted within the housing 2, and the mounting frame 9 is mounted on the transverse movement assembly. The longitudinal movement assembly is used to drive the mounting frame 9 to move longitudinally. The transverse movement assembly is mounted on the longitudinal movement assembly and is used to drive the mounting frame 9 to move laterally. Furthermore, the longitudinal movement assembly includes a moving plate 8, a stepper motor 25, and a screw 7. The screw 7 is threadedly engaged with the moving plate 8. A guide rail 1 is provided within the housing 2 to engage with the moving plate 8. The stepper motor 25 is mounted within the housing 2, and the output end of the stepper motor 25 is in transmission connection with the screw 7. Furthermore, the lateral movement component includes a moving plate 26, a stepper motor 27 and a screw rod 28. The screw rod 28 is threadedly engaged with the moving plate 26. The moving plate 1 8 is provided with a guide rail 2 that cooperates with the moving plate 26. The stepper motor 27 is installed on the moving plate 1 8. The output end of the stepper motor 27 is transmission-connected to the screw rod 28.

[0038] Specifically, under normal working conditions, the structure inside the box is as follows Figure 2 As shown, when it is necessary to remove ferromagnetic impurities on the electromagnet ring, first control the stepper motor to start and drive the screw rod to rotate, control the movable plate to move longitudinally, so that the electromagnet ring is aligned with the box cover, and then control the stepper motor to start and drive the screw rod to rotate, control the movable plate to move horizontally, so that the box cover covers the electromagnet ring, and then the electromagnet ring is powered off, and the electromagnet ring no longer generates suction for the ferromagnetic impurities, and then the negative pressure fan and the drive motor are turned on at the same time, and the drive motor controls the cleaning disk and the cleaning column to rotate, and the cleaning disk cleans the ferromagnetic impurities on the surface of the electromagnet ring, and the cleaning column cleans the ferromagnetic impurities in the through hole, and the cleaned ferromagnetic impurities enter the impurity recovery component under the action of the attraction of the negative pressure fan.

[0039] As another embodiment of the present invention, the impurity recovery component includes a collecting barrel 6 and a dust pressing mechanism; the dust pressing mechanism includes a piston head 12, a pressing rod 5 and a sealing component, the piston head 12 cooperates with the inner ring of the collecting barrel 6, the pressing rod 5 is vertically installed on the piston head 12, and the end of the pressing rod 5 away from the piston head 12 extends out of the collecting barrel 6, and a feed hole 18 is provided on the piston head 12 at a position corresponding to the feed port 21 on the collecting barrel 6, and the sealing component is used to block the feed hole 18 when the piston head 12 runs downward. Furthermore, the blocking assembly includes a second lower pressure rod 4 and a blocking plate 14. The first lower pressure rod 5 is provided with a movable hole that cooperates with the second lower pressure rod 4. The movable hole is provided with a vertical groove 16 and a transverse groove 15. The transverse groove 15 is provided at the upper end of the vertical groove 16 and is interconnected. The second lower pressure rod 4 is provided with a clamping rod 17 that cooperates with the vertical groove 16 and the transverse groove 15. The blocking plate 14 is provided at the lower end of the second lower pressure rod 4. When the clamping rod 17 enters the bottom of the transverse groove 15 from the vertical groove 16, the upper end surface of the blocking plate 14 abuts against the lower end surface of the feed hole 18. To facilitate the operation of the second lower pressure rod, a force rod is provided on the second lower pressure rod.

[0040] In the above solution, the collection bucket works normally as follows Figure 4As shown, the ferromagnetic impurities and dust coming from the box body enter the feed port on the upper cover through the connecting pipe and then enter the collection bucket through the feed hole on the piston head. When the filter screen needs to be cleaned or the ferromagnetic impurities and dust on the filter screen need to be collected, the lower pressure rod 2 is first pulled up and then the lower pressure rod 2 is rotated so that the clamping rod on the lower pressure rod 2 enters the bottom of the horizontal groove from the vertical groove. At this time, the upper end face of the sealing plate 14 abuts against the lower end face of the feed hole 18, and the feed hole is blocked. Then the lower pressure rod 2 is operated to press downward to drive the piston head to move downward. During the downward movement of the piston head, the impurities in the collection bucket will be filled. The ferromagnetic impurities and dust in the collection barrel are pressed down until the piston head is about to contact the filter screen, and the ferromagnetic impurities and dust in the collection barrel are pressed onto the filter screen. Then, the control lever 2 is rotated so that the sealing plate no longer blocks the feed hole, so that the airflow on both sides of the piston head is connected. Then, the control lever 2 is pulled upward to pull the piston head net. Since the airflow on both sides of the piston head is connected, the piston head net does not generate suction on the ferromagnetic impurities on the filter screen when it is running. Therefore, the ferromagnetic impurities and dust on the filter screen will no longer float away. Then, the cleaning port 22 can be opened to clean the filter screen and collect the ferromagnetic impurities and dust.

[0041] In order to prevent ferromagnetic impurities and dust from entering the mating surface between the piston head and the collection barrel during the downward pressure of the piston head and affecting the operation of the piston head, the dust downward pressure mechanism is also provided with a cleaning mechanism for blowing off ferromagnetic impurities and dust on the wall of the collection barrel 6. Specifically, the cleaning mechanism includes an air source, a vent pipe 20, and a plurality of purge heads 19. The vent pipe 20 is installed inside the downward pressure rod 5 and the piston head 12. The plurality of purge heads 19 are installed in an inclined annular array at the lower end of the piston head 12. One end of the vent pipe 20 is connected to the air source, and the other end is connected to the purge head 19. In this embodiment, when the piston head begins to press down, the air source is turned on, and the gas generated by the air source is ejected from the purge head through the vent pipe. Since the purge head is tilted and directed toward the barrel wall of the collection barrel, the gas blown out from the purge head can blow off the ferromagnetic impurities and dust attached to the inner wall of the collection barrel, allowing the piston head to be pressed down smoothly.

[0042] It should be noted that there is a certain pre-tightening force between the piston head and the barrel wall of the collection barrel. Therefore, after the piston head is pulled to the uppermost end by the downward pressure rod, the piston head can remain motionless under the action of the pre-tightening force.

[0043] It should be noted that in order to prevent ferromagnetic impurities from flowing out with the air, a filter is provided in the collection barrel to intercept ferromagnetic impurities. However, when a certain amount of ferromagnetic impurities is collected, the filter will be blocked by the accumulated ferromagnetic impurities, affecting the airflow through the filter. When the airflow is affected, the ability of the airflow to sweep away ferromagnetic impurities becomes weaker, affecting the collection of ferromagnetic impurities. Therefore, the filter needs to be cleaned. However, when cleaning the filter or collecting ferromagnetic impurities on the filter, the ferromagnetic impurities and dust inside the collection barrel fill the collection barrel. If the upper cover of the collection barrel is opened at this time, the ferromagnetic impurities and dust in the collection barrel will float out and affect the working environment. Therefore, it is necessary to wait until the ferromagnetic impurities and dust in the collection barrel naturally settle before opening the upper cover to reduce pollution. However, the natural settling of ferromagnetic impurities and dust in the collection barrel takes a certain amount of time, which affects the overall efficiency. In the above solution, the dust in the collection barrel 6 can be pressed down onto the filter 13 by the pressing mechanism, which greatly shortens the time for cleaning the filter or collecting ferromagnetic impurities on the filter, and effectively improves efficiency.

[0044] A negative pressure fan 33 is provided at the lower end of the collecting barrel, and negative pressure is generated by the negative pressure fan to generate suction for the ferromagnetic impurities and dust on the electromagnet ring.

[0045] The above description is merely a description of the preferred embodiment of the present invention and is not to be construed as limiting the scope of the claims. The present invention is not limited to the above embodiment, and variations in the specific structure are permitted. Any variations within the scope of the independent claims of the present invention are also within the scope of protection of the present invention.

Claims

1. A ferromagnetic impurity removal device for an internal thread forming machine, comprising a frame (1) and an impurity removal assembly, wherein the impurity removal assembly is arranged on the frame (1); characterized in that: Also included are impurity recovery components; The impurity removal assembly comprises a box (2), a mounting frame (9) and an electromagnet ring (24), wherein the mounting frame (9) is mounted in the box (2), the electromagnet ring (24) is mounted on the mounting frame (9), the electromagnet ring (24) is provided with a through hole (30) adapted to the shape of the copper tube, and both sides of the box (2) are provided with matching holes (29) in the same straight line as the through hole (30), and the copper tube can pass through the matching hole (29) on one side of the box (2) into the box (2) and then pass through the through hole (30) and out of the matching hole (29) on the other side of the box (2); The impurity recovery component is used to collect ferromagnetic impurities on the electromagnet ring (24); The impurity recovery component includes a collection barrel (6) and a dust pressing mechanism; the dust pressing mechanism includes a piston head (12), a pressing rod (5) and a blocking component, the piston head (12) cooperates with the inner ring of the collection barrel (6), the pressing rod (5) is vertically mounted on the piston head (12), and one end of the pressing rod (5) away from the piston head (12) extends out of the collection barrel (6), and a feed hole (18) is provided on the piston head (12) at a position corresponding to the feed port (21) on the collection barrel (6), and the blocking component is used to block the feed hole (18) when the piston head (12) moves downward; The blocking assembly includes a second lower pressure rod (4) and a blocking plate (14), the first lower pressure rod (5) is provided with a movable hole that cooperates with the second lower pressure rod (4), the movable hole is provided with a vertical groove (16) and a transverse groove (15), the transverse groove (15) is provided at the upper end of the vertical groove (16) and is connected to each other, the second lower pressure rod (4) is provided with a clamping rod (17) that cooperates with the vertical groove (16) and the transverse groove (15), the blocking plate (14) is provided at the lower end of the second lower pressure rod (4), and when the clamping rod (17) enters the bottom of the transverse groove (15) from the vertical groove (16), the upper end face of the blocking plate (14) abuts against the lower end face of the feed hole (18).

2. The ferromagnetic impurity removal device for an internal thread forming machine according to claim 1, characterized in that: It also includes a cleaning component for cleaning ferromagnetic impurities on the electromagnet ring (24); the ferromagnetic impurities on the electromagnet ring (24) are cleaned off by the cleaning component and then recovered by the impurity recovery component.

3. The ferromagnetic impurity removal device for an internal thread forming machine according to claim 2, characterized in that: The cleaning component comprises a box cover (23), a cleaning disc (32), a cleaning column (31) and a driving motor (11), wherein the box cover (23) is installed in the box body (2), the driving motor (11) is installed in the box cover (23), the cleaning disc (32) is installed at the output end of the driving motor (11), the cleaning column (31) is installed on the cleaning disc (32), the cleaning disc (32) is used to clean the surface of the electromagnet ring (24), the cleaning column (31) is used to clean the inner wall of the through hole (30), and one end of the box cover (23) is connected to the impurity recovery component.

4. The ferromagnetic impurity removal device for an internal thread forming machine according to claim 3, characterized in that: The impurity removal assembly further comprises a transverse moving assembly and a longitudinal moving assembly, wherein the longitudinal moving assembly is mounted in the box (2), the mounting frame (9) is mounted on the transverse moving assembly, the longitudinal moving assembly is used to drive the mounting frame (9) to move longitudinally, and the transverse moving assembly is mounted on the longitudinal moving assembly, and the transverse moving assembly is used to drive the mounting frame (9) to move transversely.

5. The ferromagnetic impurity removal device for an internal thread forming machine according to claim 4, characterized in that: The longitudinal moving assembly includes a moving plate (8), a stepping motor (25) and a screw (7), wherein the screw (7) is threadedly engaged with the moving plate (8), a guide rail (1) engaged with the moving plate (8) is provided in the box (2), the stepping motor (25) is installed in the box (2), and the output end of the stepping motor (25) is transmission-connected with the screw (7).

6. The ferromagnetic impurity removal device for an internal thread forming machine according to claim 5, characterized in that: The transverse moving assembly includes a second moving plate (26), a second stepping motor (27) and a second screw rod (28), wherein the second screw rod (28) is threadedly engaged with the second moving plate (26), the first moving plate (8) is provided with a second guide rail engaged with the second moving plate (26), the second stepping motor (27) is mounted on the first moving plate (8), and the output end of the second stepping motor (27) is transmission-connected with the second screw rod (28).

7. The ferromagnetic impurity removal device for an internal thread forming machine according to claim 1, characterized in that: The dust pressing mechanism is also provided with a cleaning mechanism for blowing off ferromagnetic impurities and dust on the wall of the collecting barrel (6).

8. The ferromagnetic impurity removal device for an internal thread forming machine according to claim 7, characterized in that: The cleaning mechanism includes an air source, a vent pipe (20) and a plurality of purge heads (19), wherein the vent pipe (20) is installed inside the lower pressure rod (5) and the piston head (12), and a plurality of purge heads (19) are installed in an inclined annular array at the lower end of the piston head (12), and one end of the vent pipe (20) is connected to the air source, and the other end is connected to the purge head (19).

Images