Horizontal directional telescopic oil cylinder oil film scraping device for drilling machine

Abstract

The invention discloses a horizontal directional telescopic oil cylinder oil film scraping device for a drilling machine, which comprises two adjusting plates, the two adjusting plates are symmetrically distributed, six chutes are formed in the adjusting plates, and the six chutes are symmetrically distributed. Belongs to the technical field of telescopic cylinders. According to the horizontal directional telescopic oil cylinder oil film scraping device for the drilling machine, the device is directly and integrally surrounded outside an oil cylinder from the side face, after the mounting plates are completely spliced, the worm is rotated until the clamping plates are attached to and abut against the surface of the telescopic oil cylinder, due to the fact that the positions of the clamping plates can be adjusted at will, the scraping plates can be selectively replaced, and due to the effect of the scraping plates, the clamping plates can be replaced selectively; in the telescopic process of the oil cylinder telescopic shaft, the scraping plate can scrape dust attached to the oil cylinder telescopic shaft, the dust is prevented from entering the telescopic oil cylinder to pollute oil liquid, meanwhile, the surface of the oil cylinder telescopic shaft can be prevented from being abraded by the dust, the whole device can adapt to telescopic oil cylinders of various specifications, and the adaptability is higher.

Description

Technical Field

[0001] The present invention relates to the technical field of telescopic oil cylinders, and more particularly to an oil film scraping device for a horizontally directional telescopic oil cylinder used in a drilling rig. Background Art

[0002] A drilling rig is a mechanical device that drives drilling tools into the ground to obtain physical geological data during exploration or mineral resource development. The horizontal directional telescopic cylinder used in the drilling rig is affected by its working environment. During use, the extended telescopic shaft will inevitably adhere to external debris, especially dust, due to the presence of oil film. Because dust is a very small particle, once it adheres to the telescopic shaft, it will easily enter the cylinder with the telescopic shaft. On the one hand, it will cause pollution to the oil inside the cylinder, and on the other hand, it will also cause wear on the surface of the cylinder telescopic shaft. Therefore, we provide an oil film scraping device for a horizontal directional telescopic cylinder used in a drilling rig. Summary of the Invention

[0003] The purpose of the present invention is to provide an oil film scraping device for a horizontal directional telescopic cylinder for a drilling rig to solve the problems raised in the above background technology: Due to the existence of oil film, the telescopic shaft of the cylinder will inevitably adhere to external debris, especially dust. Since dust is extremely fine particles, once it adheres to the telescopic shaft, it will easily enter the cylinder along with the telescopic shaft. On the one hand, it will cause pollution to the oil inside the cylinder, and on the other hand, it will also cause wear on the surface of the telescopic shaft of the cylinder.

[0004] In order to achieve the above object, the present invention provides the following technical solutions: The cam is provided with an adjusting screw mandrel which is adapted to move the adjusting screw mandrel together with the adjusting screw mandrel and the adjusting screw mandrel respectively.

[0005] Preferably, the groove is a regular hexagonal structure. When the mounting plates are assembled together, the groove as a whole is a regular hexagonal structure. The groove is used to limit the movement of the slider. When the adjustment plate rotates, the adjustment plate can drive the six clamping plates to move simultaneously through the inclined groove and the slide rod, thereby clamping the telescopic cylinder through the clamping plate.

[0006] Preferably, the scraping mechanism includes a screw hole, which is opened inside the connecting plate, and a scraper is detachably connected to the outside of the connecting plate. The scraper is an annular structure, and a through hole is opened inside the scraper. The inside of the through hole is detachably connected to a bolt, and the bolt is used in conjunction with the screw hole. The scraper is used to scrape the oil film and dust on the telescopic shaft of the cylinder.

[0007] Preferably, the transmission mechanism includes a mounting frame, which is fixedly connected to the mounting plate. There are two mounting frames in total, and the two mounting frames are symmetrically distributed. The internal rotation of the mounting frame is connected to a worm, and the outside of one of the adjustment plates is fixedly connected to a worm wheel, and the worm wheel is meshed with the worm. The worm wheel is a fan-shaped structure. This is mainly because the angle range in which the adjustment plate needs to rotate is relatively small. When the worm rotates, the adjustment plate can be driven to rotate through the worm wheel. The worm and worm wheel have self-locking capabilities, that is, only when the worm rotates will the adjustment plate rotate under the action of the worm wheel.

[0008] Preferably, both ends of the worm are fixedly connected with nuts. The nuts are for the convenience of the staff to screw the worm by using tools and nuts. When the worm rotates, the worm can drive one of the adjusting plates to rotate through the worm gear, and this adjusting plate will push the other adjusting plate to rotate together. During the process, the inclined groove on the adjusting plate will squeeze the sliding rod through its own inner wall, so that the sliding rod drives the clamping plate to move, and finally the clamping plate is used to clamp the telescopic cylinder.

[0009] Preferably, a fixing rod is fixedly connected to the interior of one of the mounting plates, wherein a limiting hole is opened in the interior of the other mounting plate, a mounting slot is opened in the interior of the fixing rod, the interior of the mounting slot is slidably connected to the limiting rod, the limiting rod is used in conjunction with the limiting hole, a spring is provided between the limiting rod and the mounting slot, one end of the spring is fixedly connected to the fixing rod, and the other end of the spring is fixedly connected to the limiting rod, the end of the outside of the limiting rod close to the limiting hole is a hemispherical structure, and in the operation of splicing the mounting plates, when the two semicircular mounting plates begin to approach each other, The hemispherical limit rod first contacts the edge of the corresponding mounting plate. As the assembly progresses, the limit rod is squeezed, overcoming the spring force and shrinking into the mounting groove. The spring is then compressed and stores elastic potential energy. In this process, the guiding effect of the hemispherical surface ensures the automatic centering of the mounting plates during docking. When the mounting plates are completely assembled, the limit hole and the limit rod are precisely aligned. At this time, the compressed spring instantly releases the stored elastic potential energy, pushing the limit rod to pop out along the axial direction of the mounting groove. With the thrust of the spring, the hemispherical end of the limit rod quickly fits into the limit hole, forming a tight mechanical lock.

[0010] Preferably, the adjustment plate, mounting plate and connecting plate are all semicircular ring structures. During the installation stage, the two semicircular ring structure mounting plates are like open and close clamps. When the device needs to be installed as a whole on the telescopic cylinder, the staff can easily open the two semicircular ring mounting plates. This split design breaks the space limitations and operational obstacles during the installation of traditional integral ring structures. In the past, the installation of integral ring components may require complicated disassembly steps or the use of large auxiliary tools. The semicircular ring mounting plates, due to their detachable characteristics, can directly surround the device from the side to the outside of the telescopic cylinder without interfering with other components around the telescopic cylinder, greatly reducing the installation difficulty and time cost. When the two semicircular ring mounting plates are pieced together, the device is tightly fitted on the outside of the telescopic cylinder to form a stable enclosing structure.

[0011] Preferably, the outer wall of the slide rod fits with the inner wall of the inclined groove, and the outer wall of the slide rod is in close contact with the inner wall of the inclined groove to form a sliding fit. The inclination angle of the inclined groove determines the direction and trajectory of the slide rod's movement. Through the constraint of the fitting surface, the inclined movement along the inclined groove direction is converted into linear movement of the slide rod. The outer wall of the slider fits with the inner wall of the groove, and the outer wall of the slider fits with the inner wall of the groove to form a horizontal and vertical sliding guide, and the freedom of movement of the slider is limited by the groove so that it can only slide along the direction of the groove to avoid shaking or deviation.

[0012] Compared with the prior art, the present invention has the following beneficial effects: 1) When the oil film scraping device of the horizontal directional telescopic cylinder of this drilling rig is in use, when it is necessary to install the device as a whole on the telescopic cylinder, the staff can easily open the two semi-circular ring-shaped mounting plates and directly surround the device as a whole on the outside of the cylinder from the side. After the mounting plates are completely assembled, the two connecting plates on the support rod will also be assembled together and surround the outside of the telescopic shaft of the cylinder. The staff will select the appropriate scraper according to the needs and install it. The worm is rotated to drive the adjustment plate to rotate through the worm gear. During the rotation of the adjustment plate, the slide rod will be squeezed through the inclined groove, so that the slide rod drives the clamping plate close to the telescopic cylinder until the clamp is The holding plate fits tightly against the surface of the telescopic cylinder, finally completing the installation and fixation between the entire device and the telescopic cylinder. Since the position of the clamping plate can be adjusted arbitrarily, the scraper can also be replaced selectively. Due to the action of the scraper, the scraper can scrape off the dust adhering to the telescopic shaft of the cylinder during the extension and retraction of the cylinder telescopic shaft, preventing dust from entering the telescopic cylinder and contaminating the oil. At the same time, it can also avoid the wear of the surface of the telescopic shaft of the cylinder by dust, so that the entire device can adapt to telescopic cylinders of various specifications and has stronger adaptability. After the adjustment plate is rotated, it is staggered with the mounting plate. At this time, the mounting plate cannot be opened, ensuring the tightness.

[0013] 2) When the oil film scraping device of the horizontal directional telescopic cylinder for this drilling rig is in use, the adjustment plate, mounting plate and connecting plate are all semi-circular ring structures. During the installation stage, the two semi-circular ring-shaped mounting plates are like open and close clamps. When the device needs to be installed as a whole on the telescopic cylinder, the staff can easily open the two semi-circular ring-shaped mounting plates. This split design breaks the space limitations and operational obstacles during the installation of traditional integral ring structures. In the past, the installation of integral ring components may require complicated disassembly steps or the use of large auxiliary tools. The semi-circular ring-shaped mounting plates, due to their detachable characteristics, can directly surround the device on the outside of the cylinder from the side without interfering with other components around the telescopic cylinder, greatly reducing the difficulty and time cost of installation.

[0014] 3) When the oil film scraping device of the horizontal directional telescopic cylinder for this drilling rig is in use, the outer end of the limit rod near the limit hole is a hemispherical structure. During the installation plate splicing operation, when the two semi-circular mounting plates begin to approach each other, the hemispherical limit rod first contacts the edge of the corresponding mounting plate. As the splicing progresses, the limit rod is squeezed, and the spring is compressed and stores elastic potential energy. The guiding effect of the hemispherical surface ensures automatic centering of the mounting plates during docking. When the mounting plates are fully spliced ​​into place, the limit hole and the limit rod are precisely aligned. At this time, the compressed spring pushes the limit rod to pop out along the axial direction of the mounting slot. With the thrust of the spring, the hemispherical end of the limit rod quickly snaps into the limit hole, forming a tight mechanical lock. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of the present invention when it is installed as a whole; Figure 2 It is a schematic structural diagram of the present invention when it is opened as a whole; Figure 3 It is a structural schematic diagram of the adjustment plate of the present invention; Figure 4 It is a structural schematic diagram of the mounting plate of the present invention; Figure 5 is a cross-sectional schematic diagram of a fixing rod of the present invention; Figure 6 It is a structural schematic diagram of the clamping plate of the present invention; Figure 7 It is a structural schematic diagram of the scraper of the present invention.

[0016] Explanation of the numbers in the figure: 1. Adjustment plate; 2. Inclined groove; 3. Slide rod; 4. Clamping plate; 5. Mounting plate; 6. Groove; 7. Slider; 8. Support rod; 9. Connecting plate; 10. Scraping mechanism; 1001. Screw hole; 1002. Scraper; 1003. Through hole; 1004. Bolt; 11. Transmission mechanism; 1101. Mounting frame; 1102. Worm; 1103. Nut; 1104. Worm wheel; 12. Fixing rod; 13. Mounting groove; 14. Limiting rod; 15. Spring; 16. Limiting hole. DETAILED DESCRIPTION

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0018] See also Figures 1 to 7 The cam 11 is provided with an adjusting plate 1 and an adjusting screw 12, and the adjusting plate 1 has two adjusting plates 1 and a lower end cam 12. The adjusting plate 1 has two adjusting plates 1 and a lower end cam 13. The adjusting plate 1 has two adjusting plates 1 and a lower end cam 14. The adjusting plate 1 has two adjusting plates 1 and a lower end cam 15.

[0019] Furthermore, the groove 6 is a regular hexagonal structure. When the mounting plates 5 are assembled together, the groove 6 as a whole is a regular hexagonal structure. The groove 6 is used to limit the movement of the slider 7. When the adjustment plate 1 rotates, the adjustment plate 1 can drive the six clamping plates 4 to move simultaneously through the inclined groove 2 and the slide rod 3, thereby clamping the telescopic cylinder through the clamping plate 4 to achieve the installation of the entire device.

[0020] Furthermore, the scraping mechanism 10 includes a screw hole 1001, which is opened inside the connecting plate 9. The outside of the connecting plate 9 is detachably connected to a scraper 1002. The scraper 1002 is an annular structure. A through hole 1003 is opened inside the scraper 1002. The inside of the through hole 1003 is detachably connected to a bolt 1004. The bolt 1004 is used in conjunction with the screw hole 1001. The scraper 1002 is used to scrape the oil film and dust on the telescopic shaft of the cylinder. Since the telescopic cylinder has a variety of specifications, there are also multiple scrapers 1002 with an annular structure, and their apertures are different. The staff needs to select and replace the scraper 1002 according to the implementation needs.

[0021] Furthermore, the transmission mechanism 11 includes a mounting frame 1101, which is fixedly connected to the mounting plate 5. There are two mounting frames 1101, and the two mounting frames 1101 are symmetrically distributed. The internal rotation of the mounting frame 1101 is connected to a worm 1102, and the outside of one of the adjustment plates 1 is fixedly connected to a worm wheel 1104, which is meshed with the worm 1102. The worm wheel 1104 is a fan-shaped structure. This is mainly because the angle range that the adjustment plate 1 needs to rotate is relatively small. When the worm 1102 rotates, it can drive the adjustment plate 1 to rotate through the worm wheel 1104. The worm 1102 and the worm wheel 1104 have self-locking capabilities. That is to say, only when the worm 1102 rotates, the adjustment plate 1 will rotate under the action of the worm wheel 1104, thereby ensuring the stability of the adjustment plate 1.

[0022] Furthermore, both ends of the worm 1102 are fixedly connected with nuts 1103. The nuts 1103 are for the convenience of the staff to screw the worm 1102 through tools and nuts 1103. When the worm 1102 rotates, the worm 1102 can drive one of the adjustment plates 1 to rotate through the worm gear 1104, and this adjustment plate 1 will push the other adjustment plate 1 to rotate together. During the process, the inclined groove 2 on the adjustment plate 1 will squeeze the slide rod 3 through its own inner wall, so that the slide rod 3 drives the clamping plate 4 to move, and finally the clamping plate 4 is used to clamp the telescopic cylinder to achieve the installation and fixation between the entire device and the telescopic cylinder.

[0023] Furthermore, a fixing rod 12 is fixedly connected to the interior of one of the mounting plates 5, and a limiting hole 16 is provided inside the other mounting plate 5. A mounting groove 13 is provided inside the fixing rod 12. The interior of the mounting groove 13 is slidably connected to the limiting rod 14. The limiting rod 14 cooperates with the limiting hole 16. A spring 15 is provided between the limiting rod 14 and the mounting groove 13. One end of the spring 15 is fixedly connected to the fixing rod 12, and the other end of the spring 15 is fixedly connected to the limiting rod 14. The end of the outer portion of the limiting rod 14 near the limiting hole 16 is a hemispherical structure. In the process of assembling the mounting plates 5 together, the limiting rod 14 will first be squeezed and contracted into the inside of the mounting groove 13. At the same time, the limiting rod 14 will compress the spring 15 in the mounting groove 13. When the mounting plates 5 are assembled, the limiting hole 16 will be on the same axis as the limiting rod 14. At this time, the elastic force of the compressed spring 15 will drive the limiting rod 14 into the limiting hole 16, so that the limiting rod 14 is combined with the limiting hole 16. The limiting rod 14 and the limiting hole 16 are used to limit the assembled mounting plates 5 to prevent automatic opening.

[0024] Furthermore, the adjusting plate 1, the mounting plate 5 and the connecting plate 9 are all semicircular ring structures. When the two mounting plates 5 of the semicircular ring structure are opened, it is convenient for the staff to install the entire device on the telescopic cylinder. When the two mounting plates 5 of the semicircular ring structure are spliced ​​together, the entire device can be sleeved on the outside of the telescopic cylinder. At this time, the adjusting plates 1 and the connecting plate 9 of the two semicircular ring structures will also be spliced ​​together accordingly. The difference is that the connecting plate 9 is sleeved on the telescopic shaft of the telescopic cylinder.

[0025] Furthermore, the outer wall of the slide bar 3 fits with the inner wall of the inclined groove 2, and the outer wall of the slide bar 3 is in close contact with the inner wall of the inclined groove 2 to form a sliding fit. The inclination angle of the inclined groove 2 determines the direction and trajectory of the movement of the slide bar 3. Through the constraint of the fitting surface, the inclined movement along the direction of the inclined groove 2 is converted into a linear motion of the slide bar 3. The outer wall of the slider 7 fits with the inner wall of the groove 6, and the outer wall of the slider 7 fits with the inner wall of the groove 6 to form a horizontal and vertical sliding guide, and the freedom of movement of the slider 7 is limited by the groove 6, so that it can only slide along the direction of the groove 6 to avoid shaking or offset. The tight fit can reduce the fitting gap and avoid motion errors or empty strokes caused by the gap.

[0026] The use steps of the present invention are as follows: When the oil film scraping device of the horizontal directional telescopic oil cylinder for the drilling rig is in use, the two semicircular ring-shaped mounting plates 5 are like an opening and closing clamp. When the device as a whole needs to be installed on the telescopic oil cylinder, the staff can easily open the two semicircular ring-shaped mounting plates 5 and directly surround the device as a whole on the outside of the oil cylinder from the side, which greatly reduces the installation difficulty and time cost. When the two semicircular ring-shaped mounting plates 5 are spliced ​​together, the device as a whole is tightly sheathed on the outside of the telescopic oil cylinder to form a stable surrounding structure. During the splicing operation of the mounting plates 5, when the two semicircular ring-shaped mounting plates 5 begin to approach each other, The limiting rod 14 first contacts the edge of the corresponding mounting plate 5. Since one end of the limiting rod 14 is a hemispherical structure, as the assembly advances, the limiting rod 14 is squeezed, overcoming the elastic force of the spring 15 to shrink toward the inside of the mounting groove 13. The spring 15 is then compressed and stores elastic potential energy. When the mounting plate 5 is fully assembled, the limiting hole 16 is precisely aligned with the limiting rod 14. At this time, the compressed spring 15 instantly releases the stored elastic potential energy, pushing the limiting rod 14 to pop out axially along the mounting groove 13. With the thrust of the spring 15, the hemispherical end of the limiting rod 14 is quickly stuck in the limiting hole 16, forming a tight mechanical lock. After the mounting plate 5 is fully assembled, the support rod 14 The two connecting plates 9 on 8 will also be pieced together and surround the outside of the telescopic shaft of the oil cylinder. The staff will select a suitable scraper 1002 according to their needs and put it on the telescopic shaft of the oil cylinder. By pushing the scraper 1002, it will fit with the connecting plate 9. Finally, the scraper 1002 is fixed to the connecting plate 9 through the bolt 1004 and the screw hole 1001. Then, the worm 1102 on the mounting frame 1101 is rotated so that the worm 1102 drives the adjusting plate 1 to rotate through the worm gear 1104. During the rotation of the adjusting plate 1, the slide rod 3 will be squeezed through the inclined groove 2, so that the slide rod 3 drives the clamping plate 4 close to the telescopic oil cylinder until the clamping plate 4 is close to the telescopic oil cylinder. The surface of the oil cylinder fits tightly together, and finally the installation and fixation between the entire device and the telescopic oil cylinder are completed. Since the position of the clamping plate 4 can be adjusted arbitrarily, the scraper 1002 can also be replaced selectively. Due to the action of the scraper 1002, during the extension and retraction of the oil cylinder telescopic shaft, the scraper 1002 can scrape off the dust adhering to the telescopic shaft of the oil cylinder to prevent dust from entering the interior of the telescopic oil cylinder and contaminating the oil. At the same time, it can also avoid the wear of the surface of the telescopic shaft of the oil cylinder by dust, so that the entire device can adapt to telescopic oil cylinders of various specifications, and has stronger adaptability. After the adjustment plate 1 rotates, it is staggered with the mounting plate 5. At this time, the mounting plate 5 cannot be opened, ensuring the tightness.

[0027] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A horizontal directional telescopic oil cylinder oil film scraping device for a drilling rig, comprising an adjusting plate (1), wherein there are two adjusting plates (1) in total, and the two adjusting plates (1) are symmetrically distributed, and an inclined groove (2) is opened inside the adjusting plate (1), and there are six inclined grooves (2) in total, and the six inclined grooves (2) are symmetrically distributed, characterized in that: The adjusting plate (1) is provided with a transmission mechanism (11) on the outside, the inclined groove (2) is slidably connected to a slide rod (3) on the inside, and both ends of the slide rod (3) are fixedly connected to a clamping plate (4), and the outside of the clamping plate (4) is slidably connected to a mounting plate (5) on the side away from the slide rod (3), and two adjacent mounting plates (5) are rotatably connected, and a groove (6) is provided on the inside of the mounting plate (5) close to the clamping plate (4), and a slider (7) is slidably connected to the inside of the groove (6), and the slider (7) is fixedly connected to the clamping plate (4), and the outside of the mounting plate (5) is fixedly connected to a support rod (8), and the outside of the support rod (8) is fixedly connected to a connecting plate (9) on the end away from the mounting plate (5), and a scraping mechanism (10) is provided on the outside of the connecting plate (9).

2. The oil film scraping device for a horizontal directional telescopic cylinder for a drilling rig according to claim 1, characterized in that: The groove (6) is a regular hexagonal structure.

3. The oil film scraping device for a horizontal directional telescopic cylinder for a drilling rig according to claim 1, characterized in that: The scraping mechanism (10) comprises a screw hole (1001), the screw hole (1001) being provided inside the connecting plate (9), the outside of the connecting plate (9) being detachably connected to a scraper (1002), the scraper (1002) being an annular structure, the inside of the scraper (1002) being provided with a through hole (1003), the inside of the through hole (1003) being detachably connected to a bolt (1004), the bolt (1004) being used in conjunction with the screw hole (1001).

4. The oil film scraping device for a horizontal directional telescopic cylinder for a drilling rig according to claim 1, characterized in that: The transmission mechanism (11) comprises a mounting frame (1101), wherein the mounting frame (1101) is fixedly connected to the mounting plate (5), and there are two mounting frames (1101) in total, and the two mounting frames (1101) are symmetrically distributed. The interior of the mounting frame (1101) is rotatably connected to a worm (1102), and the exterior of one of the adjustment plates (1) is fixedly connected to a worm wheel (1104), and the worm wheel (1104) is meshingly connected to the worm wheel (1102).

5. The oil film scraping device for a horizontal directional telescopic cylinder for a drilling rig according to claim 4, characterized in that: Both ends of the worm (1102) are fixedly connected with nuts (1103).

6. The oil film scraping device for a horizontal directional telescopic cylinder for a drilling rig according to claim 1, characterized in that: A fixing rod (12) is fixedly connected to the interior of one of the mounting plates (5), a limiting hole (16) is provided in the interior of the other mounting plate (5), a mounting groove (13) is provided in the interior of the fixing rod (12), a limiting rod (14) is slidably connected to the interior of the mounting groove (13), the limiting rod (14) is used in conjunction with the limiting hole (16), a spring (15) is provided between the limiting rod (14) and the mounting groove (13), one end of the spring (15) is fixedly connected to the fixing rod (12), and the other end of the spring (15) is fixedly connected to the limiting rod (14).

7. The oil film scraping device for a horizontal directional telescopic cylinder for a drilling rig according to claim 1, characterized in that: The adjustment plate (1), the mounting plate (5) and the connecting plate (9) are all semicircular ring structures.

8. The oil film scraping device for a horizontal directional telescopic cylinder for a drilling rig according to claim 1, characterized in that: The outer side wall of the slide bar (3) fits with the inner side wall of the inclined groove (2), and the outer side wall of the slider (7) fits with the inner side wall of the groove (6).

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