Quick locking device

Abstract

The utility model relates to a quick locking device, which comprises a male joint and a female joint, the male joint comprises a male seat, an air cavity is arranged at the center of the outer end of the male seat, and an upper air hole and a lower air hole which are communicated with the air cavity are arranged on the outer side surface of the male seat; an airtight cover plate is arranged at the outer end of the male seat; a sleeving hole is formed in the center of the inner end of the male seat, a connecting plug is arranged in the sleeving hole, a guide hole is formed in the center of the outer end of the connecting plug, a movable cavity is formed in the center of the inner end of the connecting plug, and a steel ball is arranged on the inner side of the movable cavity; a piston head is arranged in the air cavity, a steel ball fixing block is arranged in the movable cavity, a push rod is arranged in the guide hole, and the two ends of the push rod are fixedly connected with the piston head and the steel ball fixing block respectively. The female connector is composed of a female base and a locking plate. According to the quick locking device, the male connector and the female connector are matched with each other in a high-precision manner, slippage is avoided after locking, and the connection efficiency between the male connector and the female connector is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to robot tool quick change joint in automation production and processing, especially to a quick locking device. BACKGROUND

[0002] In automation production and processing, robot tool quick change joint is a device for robot to quickly replace end effector, can quickly replace different end execution tools in several seconds, is widely used in each field of automation industry.

[0003] The existing tool robot tool quick change joint is all by the male joint and the female joint that can mutually cooperate, the male joint is fixedly installed on the robot arm, and the female joint is connected together with the end execution tool that needs to be connected with the robot arm, and the robot arm can be connected with the female joint on the required execution tool through the male joint connected with it, realizes the quick replacement of the end execution tool of implement.

[0004] However, the existing robot tool quick change joint structure is complex, the inner end face of the male joint and the inner end face of the female joint need to be accurately corresponding when butting to be able to be connected together, once the angle deviation of the male joint or the female joint or the phenomenon of position not being right and being inclined occurs, the butt joint of the male joint and the female joint cannot be realized, the replacement speed of the end execution tool on the robot arm is influenced, and further the processing efficiency is influenced. SUMMARY

[0005] The utility model solves the technical problem that the utility model provides a quick locking device that can guarantee that the male joint and the female joint can be quickly positioned and connected.

[0006] In order to solve the above technical problem, the utility model is realized through the following technical scheme:

[0007] A quick locking device, comprising a male connector and a female connector capable of being connected to each other, the male connector comprising a male seat, the outer end of the male seat being provided with an air cavity in the center, the outer side being provided with an upper air hole communicating with the top of the side of the air cavity and a lower air hole communicating with the bottom of the side of the air cavity; the outer end of the male seat is provided with an air-tight cover plate for closing the air cavity port; the inner end of the male seat is provided with a sleeve hole in the center communicating with the air cavity, the diameter of the sleeve hole is larger than that of the air cavity, the sleeve hole is provided with a plug connector fitted therein, the outer end of the plug connector is provided with a guide hole in the center, the inner end is provided with a movable cavity, the diameter of the movable cavity is larger than that of the guide hole, the inner side of the movable cavity is provided with a steel ball cavity communicating with the outer side of the plug connector, the steel ball is embedded in the steel ball cavity, the steel ball can partially protrude outside the plug connector through the steel ball cavity; the air cavity is provided with a piston head slidingly fitted therein, the movable cavity is provided with a steel ball fixing block slidingly fitted therein, the guide hole is provided with a push rod slidingly fitted therein, the two ends of the push rod are fixedly connected with the piston head and the steel ball fixing block respectively; the female connector is composed of a female seat and a locking plate; the inner end of the female seat is provided with an embedded hole in the center, the locking plate is embedded in the embedded hole, and the two are fixedly connected by screws, the outer end surface of the locking plate is flush with the inner end surface of the female seat; the inner end of the embedded hole is provided with a lower locking hole in the center, the inner end of the locking plate is provided with an upper locking hole corresponding to the lower locking hole, the outline and diameter of the upper locking hole are consistent with those of the lower locking hole, the outer end of the locking plate is provided with a guide hole communicating with the upper locking hole, the diameter of the guide hole is consistent with the inner end diameter of the plug connector, and the inner end of the plug connector can be inserted into the upper locking hole and the lower locking hole connected together through the guide hole.

[0008] Further, the outer side of the male seat is provided with an upper water / air-tight sealing hole communicating with the inner end edge thereof, the upper water / air-tight sealing hole is provided with a water / air-tight sealing soft connector fixedly connected therewith, the end center of the water / air-tight sealing soft connector is provided with a front and rear communicating guide connection hole; the outer side of the female seat is provided with a lower water / air-tight sealing hole communicating with the inner end edge thereof, the lower water / air-tight sealing hole is in upper and lower correspondence with the upper water / air-tight sealing hole, and the part of the water / air-tight sealing soft connector located outside the upper water / air-tight sealing hole can be inserted and matched in the lower water / air-tight sealing hole.

[0009] Further, the outer end of the plug connector is provided with a conical protrusion integrally formed therewith, and the piston head is provided with a conical cavity on the side corresponding to the push rod, which is fitted with the conical protrusion.

[0010] Further, the part near the outer end of the plug connector is provided with a connecting part integrally formed therewith, the connecting part is fitted in the sleeve hole and fixedly connected with the male seat by screws; the connecting part corresponds to the locking plate and the diameters are consistent, and the connecting part and the locking plate can be attached to each other.

[0011] Further, one end of the corresponding locking plate of the adapter is provided with a guide positioning column, and the locking plate and the female seat are provided with a guide positioning hole matched with the guide positioning column.

[0012] Further, the steel ball fixing block is tapered, and the diameter of one end of the steel ball fixing block corresponding to the end of the movable cavity is smaller than the diameter of the other end.

[0013] Compared with the prior art, the beneficial effects of the utility model are as follows: the male connector and the female connector of the quick locking device are high-precision matched, no slippage phenomenon occurs after locking, the stability is good, it is plug and play, the quick switching between the robot arm and the end execution tool is realized, the guide positioning column and the guide positioning hole are matched with each other to assist the guide, even if there is an inclination angle between the male connector and the female connector during the butt joint, the male connector and the female connector can also be automatically aligned, the connection efficiency between the male connector and the female connector is improved, and the production efficiency is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiments, and it should be understood that the following drawings only show some embodiments of the utility model, and therefore should not be regarded as the limitation to the scope, and for the ordinary skilled in the art, other related drawings can also be obtained according to these drawings without the creative labor.

[0015] Figure 1 It is a three-dimensional structure schematic view of the quick locking device of the utility model;

[0016] Figure 2 It is a side structure schematic view of the quick locking device of the utility model;

[0017] Figure 3 It is a top view structure schematic view of the quick locking device of the utility model;

[0018] Figure 4 It is Figure 3 the structure sectional view of A-A in it;

[0019] Figure 5 It is the split structure sectional view of the male connector in the quick locking device of the utility model.

[0020] In the figure: 1, male connector; 11, male seat; 111, upper water / gas seal hole; 1111, water / gas seal soft connector; 112, gas cavity; 113, sleeve hole; 114, upper gas hole; 115, lower gas hole; 12, gas seal cover plate; 13, plug connector; 130, connecting part; 131, guide positioning column; 132, guide hole; 133, movable cavity; 134, steel ball cavity; 135, steel ball; 136, conical protrusion; 14, push rod; 141, piston head; 142, conical cavity; 15, steel ball fixing block; 2, female connector; 21, female seat; 211, lower water / gas seal hole; 212, embedded hole; 213, lower locking hole; 22, locking plate; 221, guide positioning hole; 222, guide hole; 223, upper locking hole. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present application. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In the description of the embodiments of the present application, it should be noted that if the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, or is the orientation or positional relationship when the product of the present application is usually placed, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" and the like are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0023] In addition, if the terms "horizontal", "vertical" and the like appear, it does not mean that the component must be absolutely horizontal or vertical, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure or component must be completely horizontal, but can be slightly inclined.

[0024] In the description of the embodiments of the utility model, "multiple" represents at least 2.

[0025] In the description of the embodiments of the utility model, it also needs to be explained that, unless there is explicit provision and limitation, if the terms "set", "install", "connect" and "connect" appear, it should be understood in a broad sense. For example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific situation.

[0026] Embodiment

[0027] Please refer to the drawings in the description Figures 1 to 4 in the description Figures 1 to 4 A kind of quick locking device shown in the drawings, for automation production, mainly applied to the replacement of robot arm end execution tool's interface, the quick locking device described in the embodiment includes male connector 1 and female connector 2 that can be mutually inserted, referring to the drawings in the description Figure 4 and 5 In the description, the male connector 1 includes male seat 11, the male seat 11 is processed from 7075-t651 aviation aluminum material, has strong pressure capacity, good corrosion resistance and oxidation resistance, improves its service life;The outer end of the male seat 11 is provided with a gas cavity 112, the outer end of the gas cavity 112 is open, and the structure is circular;In order to be able to pump and exhaust to the gas cavity 112, the outer side of the male seat 11 is provided with upper air hole 114 and lower air hole 115 which are communicated with the top and bottom of the side of the gas cavity 112 respectively, and the upper air hole 114 and the lower air hole 115 can be connected with the air pipe on the gas source;In order to ensure the sealing property of the gas cavity 112, the outer end of the male seat 11 is provided with airtight cover plate 12 for closing the port of the gas cavity 112, the airtight cover plate 12 is connected with the male seat 11 by screw, and is convenient to disassemble and assemble, in order to ensure the sealing effect between the airtight cover plate 12 and the male seat 11, O-shaped sealing ring is arranged between the contact surface of the airtight cover plate 12 and the male seat 11, the O-shaped sealing ring is made of butyl rubber, and is wear-resistant, corrosion-resistant and high-temperature-resistant;Further, referring to the drawings in the description Figure 4 and 5As shown, the inner end center of the male seat 11 is provided with a sleeve joint hole 113 in communication with the air cavity 112, the diameter of the sleeve joint hole 113 is larger than that of the air cavity 112, and a plug joint 13 is arranged in the sleeve joint hole 113 in sleeve joint cooperation, the plug joint 13 is made of 42Cr, has good wear resistance and high hardness, and can greatly increase the service life of the product; refer to the drawings Figure 4 and 5As shown, the plug-in connector 13 is provided with an adapter 130 integrally formed near its outer end, the adapter 130 is fitted in the socket hole 113, and the adapter 130 is fixedly connected with the male seat 11 by screws, thereby fixing the plug-in connector 13 and the male seat 11 together. In order to ensure the sealing, an O-shaped sealing ring made of butyl rubber is arranged between the adapter 130 and the socket hole 113. The outer end of the plug-in connector 13 is provided with a conical protrusion 136 integrally formed thereon, which is located in the air cavity 112. The outer end of the plug-in connector 13 is provided with a guide hole 132 in the center, and the inner end is provided with a movable cavity 133. The diameter of the movable cavity 133 is larger than that of the guide hole 132. The movable cavity 133 is provided with a steel ball cavity 134 on the inner side, which is in communication with the outer side of the plug-in connector 13. A steel ball 135 is embedded in the steel ball cavity 134, which can roll in the steel ball cavity 134. It should be noted that the steel ball cavity 134 has a plurality of circular arrays with the center of the end face of the movable cavity 133 as the center. Each steel ball cavity 134 is provided with a movable steel ball 135. The steel ball 135 can partially protrude on the outer side of the plug-in connector 13 through the steel ball cavity 134. The air cavity 112 is provided with a piston head 141 in sliding fit therewith. The movable cavity 133 is provided with a steel ball fixing block 15 in sliding fit therewith. The guide hole 132 is provided with a push rod 14 in sliding fit therewith. The two ends of the push rod 14 are fixedly connected with the piston head 141 and the steel ball fixing block 15, respectively. It should be noted that the steel push rod 14 and the ball fixing block 15 are both made of 42Cr. An O-shaped sealing ring made of butyl rubber is embedded on the inner wall surface of the guide hole 132, which can increase the sealing between the push rod 14 and the guide hole 132. An O-shaped sealing ring made of butyl rubber is embedded on the outer peripheral surface of the piston head 141, which can increase the sealing between the outer side of the piston head 141 and the inner wall surface of the air cavity 112. The piston head 141 is provided with a conical cavity 142 on the side corresponding to the conical protrusion 136 in fitting fit. The inner end of the lower air hole 115 corresponds to the position between the bottom of the piston head 141 and the top of the adapter 130 in the air cavity 112. The inner end of the upper air hole 115 corresponds to the top of the piston head 141. Figure 4 and 5 As shown, the steel ball fixing block 15 has a conical structure, and the diameter of one end corresponding to the port of the movable cavity 133 is smaller than that of the other end.Figure 1 and 4 As shown, the female connector 2 consists of a female base 21 and a locking plate 22. The female base 21 is made of 7075-T651 aviation aluminum, which has strong pressure resistance, good corrosion resistance and oxidation resistance, and improves its service life. The inner end center of the female base 21 is provided with a recessed hole 212, and the locking plate 22 is embedded in the recessed hole 212. They are fixedly connected by screws, which is convenient for disassembly and assembly. It should be noted that the locking plate 22 is made of 42Cr, and its outer end face is flush with the inner end face of the female base 21. The connecting part 130 corresponds to the locking plate 22 and the diameter matches. The connecting part 130 and the locking plate 22 can fit together. See the attached manual. Figure 2 , 3 As shown in Figures 4 and 5, to ensure the accuracy of the mating of male connector 1 and female connector 2, and to ensure that even if male connector 1 or female connector 2 is tilted during mating, it can automatically return to its original position, a guide positioning post 131 is provided at one end of the upper part of the connecting portion 130 corresponding to the locking plate 22. The locking plate 22 and the female seat 21 are provided with guide positioning holes 221 that are inserted and engaged with the guide positioning post 131. The inserted and engaged guide positioning post 131 and guide positioning hole 221 ensure accurate mating of male connector 1 and female connector, and can return to its original position even if tilted. In order to lock male connector 1 and female connector 2 together after mating, a lower locking hole 213 is provided at the center of the inner end of the recess 212. The locking plate 2 The upper locking hole 223 is provided at the center of the inner end of the lower locking hole 213. The outline and diameter of the upper locking hole 223 match those of the lower locking hole 213. The center of the outer end of the locking plate 22 is provided with a guide hole 222 that communicates with the upper locking hole 223. The diameter of the guide hole 222 matches the inner diameter of the connector 13. The inner end of the connector 13 can be inserted into the upper locking hole 223 and the lower locking hole 213 connected together through the guide hole 222. The steel ball 135 on the connector 13 can protrude from the outside of the connector 13 and cooperate with the sides of the upper locking hole 223 and the lower locking hole 213 that are connected to each other, so as to lock the male connector 1 and the female connector 2 and prevent them from loosening.

[0028] To enable different media, such as air and liquids, to be connected from the robotic arm to the end effector, please refer to the attached manual. Figure 1 and 2As shown, the outer side of the male seat 11 is provided with an upper water / gas sealing hole 111 which is in communication with the inner end edge thereof, the upper water / gas sealing hole 111 has multiple groups, the port at the inner end of the male seat 11 is provided with a water / gas sealing soft joint 1111 which is fixedly connected thereto, the center of the end of the water / gas sealing soft joint 1111 is provided with a front-rear communication guide connecting hole, facilitating the communication of gas or liquid; the outer side of the female seat 21 is provided with a lower water / gas sealing hole 211 which is in communication with the inner end edge thereof, the number and position of the lower water / gas sealing hole 211 correspond to the number and position of the upper water / gas sealing hole 111, and the part of the water / gas sealing soft joint 1111 which is located outside the upper water / gas sealing hole 111 can be inserted and matched in the lower water / gas sealing hole 211.

[0029] In operation, the male joint 1 is connected with the female joint 2, and the guide positioning column 131 and the guide positioning hole 221 which are inserted and matched can ensure the connection accuracy of the male joint 1 and the female joint 2, and improve the connection speed, after the male joint 1 and the female joint 2 are completely matched, the gas source fills the upper gas hole 114 through the pipeline, with the increase of the gas pressure between the piston head 141 and the gas tight cover plate 12 in the gas cavity 112, the internal pressure pushes the piston head 141 to move towards the female joint 2, the piston head 141 pushes the push rod 14 to move synchronously, similarly, the push rod 14 pushes the steel ball fixing block 15 connected thereto to move synchronously, the steel ball fixing block 15 drives the steel ball 135 to move radially outwardly through the outer side thereof, until the conical cavity 142 on the piston head 141 is matched with the conical protrusion 136, at this time, the steel ball 135 protrudes partially outside the insertion joint 13, and the protruding part is matched with the combined part of the upper locking hole 223 and the lower locking hole 213, so as to lock the male joint 1 on the female joint 2; when the male joint 1 and the female joint 2 are separated, the upper gas hole 114 is exhausted, and the lower gas hole 115 fills the gas cavity 112 between the piston head 141 and the insertion joint 13, the piston head 141 is pushed towards the gas tight cover plate 12 by the gas pressure, correspondingly, the piston head 141 drives the push rod 14 and the steel ball fixing block 15 to move synchronously, the restriction of the steel ball 135 by the outer side of the steel ball fixing block 15 is relaxed, and the steel ball 135 can be completely withdrawn into the steel ball cavity 134, so as to realize the unlocking between the male joint 1 and the female joint 2, and facilitate the separation of the male joint 1 and the female joint 2.

[0030] The male connector 1 and the female connector 2 are high-precision matched, the male seat 11 and the female seat 21 are made of 7075-t651 aviation aluminum material, have good pressure bearing capacity, corrosion resistance and oxidation resistance effect, the sealing ring is made of butadiene rubber material, is wear-resistant, corrosion-resistant and high-temperature-resistant, the plug connector 13, the push rod 14, the steel ball fixing block 15 and the locking plate 22 are made of 42Cr, are wear-resistant and high-hardness, can greatly increase the service life of the product, the male seat 11 and the female seat 21 are not slidable after being matched and locked, are stable, are plug-and-play, realize the quick switching between the robot arm and the end execution tool, the guide positioning column 131 and the guide positioning hole 221 can be mutually matched and guided, even if there is an inclination angle between the male connector 1 and the female connector 2 when being connected, the male connector 1 and the female connector 2 can be automatically returned to the normal position, the connection efficiency between the male connector 1 and the female connector 2 is improved, and the production efficiency is ensured.

[0031] It should be emphasized that the above are only the preferred embodiments of the present application, and are not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A quick-locking device comprising a male connector (1) and a female connector (2) which can be connected to each other by mutual insertion, characterized in that: The male joint (1) comprises a male seat (11), the outer end of the male seat (11) is provided with an air cavity (112) in the center, the outer side is provided with an upper air hole (114) which is in communication with the top of the side of the air cavity (112) and a lower air hole (115) which is in communication with the bottom of the side of the air cavity (112); the outer end of the male seat (11) is provided with an air-tight cover plate (12) for closing the port of the air cavity (112); the inner end of the male seat (11) is provided with a sleeve joint hole (113) in the center which is in communication with the air cavity (112), the diameter of the sleeve joint hole (113) is larger than that of the air cavity (112), the sleeve joint hole (113) is provided with a plug joint (13) which is in sleeve joint with it, the outer end of the plug joint (13) is provided with a guide hole (132) in the center, the inner end is provided with a movable cavity (133) in the center, the diameter of the movable cavity (133) is larger than that of the guide hole (132), the inner side of the movable cavity (133) is provided with a steel ball cavity (134) which is in communication with the outer side of the plug joint (13), the steel ball cavity (134) is embedded with a steel ball (135), the steel ball (135) can partially protrude on the outer side of the plug joint (13) through the steel ball cavity (134); the air cavity (112) is provided with a piston head (141) which is in sliding fit with it, the movable cavity (133) is provided with a steel ball fixing block (15) which is in sliding fit with it, the guide hole (132) is provided with a push rod (14) which is in sliding fit with it, the two ends of the push rod (14) are fixedly connected with the piston head (141) and the steel ball fixing block (15) respectively; the female joint (2) is composed of a female seat (21) and a locking plate (22); the inner end of the female seat (21) is provided with an embedded hole (212) in the center, the locking plate (22) is embedded in the embedded hole (212), and they are fixedly connected through screws, the outer end surface of the locking plate (22) is flush with the inner end surface of the female seat (21); the inner end of the embedded hole (212) is provided with a lower locking hole (213) in the center, the inner end of the locking plate (22) is provided with an upper locking hole (223) corresponding to the lower locking hole (213), the contour and diameter of the upper locking hole (223) are consistent with those of the lower locking hole (213), the outer end of the locking plate (22) is provided with a guide hole (222) which is in communication with the upper locking hole (223), the diameter of the guide hole (222) is consistent with the inner end diameter of the plug joint (13), the inner end of the plug joint (13) can be inserted into the upper locking hole (223) and the lower locking hole (213) which are connected together through the guide hole (222).

2. A quick locking device according to claim 1, characterized in that: The outer side of the male seat (11) is provided with an upper water / air sealing hole (111) which is in communication with the inner end edge thereof, and the water / air sealing soft joint (1111) is fixedly connected in the upper water / air sealing hole (111), and the end portion of the water / air sealing soft joint (1111) is provided with a front-rear communication guide connecting hole; the outer side of the female seat (21) is provided with a lower water / air sealing hole (211) which is in communication with the inner end edge thereof, and the lower water / air sealing hole (211) corresponds to the upper water / air sealing hole (111) in up-down direction, and the part of the water / air sealing soft joint (1111) which is located outside the upper water / air sealing hole (111) can be inserted and matched in the lower water / air sealing hole (211).

3. A quick locking device according to claim 1, characterized in that: The outer end of the plug connector (13) is provided with a conical protrusion (136) which is integrally formed with the plug connector (13), and the piston head (141) is provided with a conical cavity (142) which is sleeved and matched with the conical protrusion (136) on the side corresponding to the push rod (14).

4. The quick locking device of claim 1, wherein: The part of the plug connector (13) which is close to the outer end thereof is provided with a connecting part (130) which is integrally formed with the plug connector (13), the connecting part (130) is sleeved and matched in the sleeving hole (113), and the connecting part (130) is fixedly connected with the male seat (11) through a screw; the connecting part (130) corresponds to the locking plate (22) and has a diameter which is consistent with the locking plate (22), and the connecting part (130) and the locking plate (22) can be mutually adhered.

5. A quick locking device according to claim 4, characterized in that: One end of the connecting part (130) which corresponds to the locking plate (22) is provided with a guide positioning column (131), and the locking plate (22) and the female seat (21) are provided with a guide positioning hole (221) which is inserted and matched with the guide positioning column (131).

6. A quick locking device according to claim 1, characterized in that: The steel ball fixing block (15) has a conical structure, and the diameter of one end of the steel ball fixing block (15) which corresponds to the port of the movable cavity (133) is smaller than the diameter of the other end.

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