Cleaning apparatus for improving cleaning effect of electric motor

Abstract

A cleaning apparatus for improving the cleaning effect of an electric motor, the cleaning apparatus comprising: a vibration mechanism, which comprises a vibration cylinder, a handheld handle mounted at one end of the vibration cylinder, and a vibration source assembly mounted in the vibration cylinder; a sponge sleeve, which is located on the outer side of the vibration cylinder; and a locking mechanism for fixing the position of the sponge sleeve. A positioning assembly is deployed by means of rotating a driving assembly, and the sponge sleeve is slidably sleeved from one end of the vibration cylinder; when the sponge sleeve reaches the interior of the positioning assembly, the driving assembly is released to enable the positioning assembly to limit the sponge sleeve; the vibration source assembly is powered by a battery; and the vibration source assembly is turned on to operate, the operation of the vibration source assembly causes the vibration cylinder to vibrate in synchronization, and the vibration of the vibration cylinder causes the sponge sleeve to vibrate and clean a part of the electric motor that needs to be cleaned, thereby improving the cleaning efficiency of workers on the electric motor.

Description

A cleaning device for improving the cleaning effect of an electric motor Technical Field

[0001] The present invention relates to the technical field of electric motor cleaning, and in particular to a cleaning device for improving the cleaning effect of an electric motor. Background Art

[0002] During the operation of the motor, dust, oil and other impurities will accumulate due to long-term use. These impurities will reduce the heat dissipation capacity of the motor, causing the temperature to rise, thereby reducing the working efficiency of the motor. Regular cleaning of the motor can effectively remove these impurities and maintain the efficient operation of the motor. The motor is a key equipment in industrial production. The length of its service life directly affects the stability and economic benefits of industrial production. Cleaning can remove the dust and grease inside the motor to prevent them from corroding and damaging the internal parts of the motor and extend the service life of the motor. The dirt and dust inside the motor will increase the friction and wear of the motor, thereby increasing the risk of motor failure and accidents. Cleaning the motor can reduce these risks and improve the safety of the motor. Therefore, regular cleaning of the motor is very important for maintaining the working efficiency of the motor, extending its service life and improving its safety.

[0003] One of the existing methods for cleaning motor oil stains is to use a traditional brush dipped in a charged cleaning agent for cleaning. However, since the root of the brush is soft and each fine hair has stress, the brush cannot reach the corners or crevices, or cannot be brushed cleanly. In addition, the brush has to be wiped back and forth manually, and the frequency is too slow. The brush has a weak ability to absorb the charged cleaning agent, so it needs to be dipped in the charged cleaning agent frequently. At the same time, the brush is prone to frying during use, and the effect of using rags is not ideal. The existing method has low work efficiency and consumes labor and material costs.

[0004] Summary of the Invention

[0005] In view of the problems that the above-mentioned existing cleaning devices for improving the cleaning effect of electric motors have difficulty in cleaning certain areas of the electric motor and manual wiping cleaning efficiency is low, the present invention is proposed.

[0006] Therefore, an object of the present invention is to provide a cleaning device for improving the cleaning effect of an electric motor.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: A cleaning device for improving the cleaning effect of an electric motor, comprising a vibration mechanism, including a vibration cylinder, a hand-held handle installed at one end of the vibration cylinder, and a vibration source assembly installed inside the vibration cylinder; a sponge cover located on the outside of the vibration cylinder; and a locking mechanism for fixing the position of the sponge cover, comprising a positioning assembly installed on the outside of the vibration cylinder and a drive assembly installed on the outside of the positioning assembly; a battery is installed on the internal limit of the hand-held handle, and the battery and the vibration source assembly are electrically connected.

[0008] As a preferred solution of the cleaning device for improving the cleaning effect of the electric motor described in the present invention, the vibration source component includes a spring steel ball part, one end of which is fixedly connected to a motor part; the motor part is fixedly installed inside the vibration cylinder.

[0009] As a preferred solution of the cleaning device for improving the cleaning effect of the motor described in the present invention, wherein: the spring steel ball part includes a long spring, one end of the long spring is fixedly connected to a large steel ball, the other end of the long spring is fixedly connected to a coupling, the lower end of the coupling is fixedly connected to a short spring 1, the end of the short spring 1 is fixedly connected to a small steel ball 1, the upper end of the coupling is fixedly connected to a short spring 2, the end of the short spring 2 is fixedly connected to a small steel ball 2; the length of the short spring 2 is greater than that of the short spring 1, the diameters of the small steel ball 1 and the small steel ball 2 are the same, and the large steel ball is located near the inner end of the vibration tube.

[0010] As a preferred solution of the cleaning device for improving the cleaning effect of the electric motor described in the present invention, the motor component includes a motor body, and a fixing ring is fixedly connected to the outer side of the motor body; the motor body is fixedly installed on the inner wall of the vibration cylinder through the fixing ring, and the output end of the motor body is fixedly connected to the coupling.

[0011] As a preferred solution of the cleaning device for improving the cleaning effect of the electric motor described in the present invention, the positioning assembly includes a grooved hollow column, a plurality of clamping members and a plurality of hexagonal threaded rods, and the clamping members are rotated and embedded in the interior of the grooved hollow column through the hexagonal threaded rods; the grooved hollow column is fixedly installed on the outer wall of the vibration cylinder and close to the hand-held handle, and the driving assembly is sleeved on the outside of the grooved hollow column.

[0012] As a preferred solution of the cleaning device for improving the cleaning effect of the electric motor described in the present invention, the driving assembly includes a hollow knob with a groove, and a plurality of push plates 1, grooved blocks and push plates 2 are fixedly connected to the hollow knob with a groove in sequence.

[0013] As a preferred solution of the cleaning device for improving the cleaning effect of the electric motor described in the present invention, the grooved hollow column member includes a grooved hollow column body, and the outer side of the grooved hollow column body is provided with several movable grooves 1 and several movable grooves 2. The outer side of the grooved hollow column body is also fixedly connected to several connecting plates, and one side of the connecting plate is also fixedly connected to a guide rod, the end of the guide rod is fixedly connected to a limiting ring, and the outer side of the guide rod is also sleeved with a reset spring.

[0014] As a preferred solution of the cleaning device for improving the cleaning effect of the electric motor described in the present invention, the clamping member includes a clamping plate, a positioning hole is opened at one end of the clamping plate, a paddle 1 is fixedly connected to the outer side of the clamping plate near the positioning hole, and a paddle 2 is also fixedly connected to the outer side of the clamping plate away from the paddle 1.

[0015] As a preferred solution of the cleaning device for improving the cleaning effect of the electric motor described in the present invention, the clamping plate is rotated and embedded in the interior of the slotted hollow column body after passing through the positioning hole through the hexagonal threaded rod, the paddle 1 passes through the movable slot 1, and the paddle 2 passes through the movable slot 2.

[0016] As a preferred solution of the cleaning device for improving the cleaning effect of the electric motor described in the present invention, the grooved hollow knob is sleeved on the outside of the grooved hollow column body, the grooved hollow knob is also blocked by the hand-held handle, the grooved clamping block is embedded in the outside of the guide rod, the grooved clamping block is located between the limiting ring and the return spring, the push plate 1 is against the paddle 1, and the push plate 2 is against the paddle 2.

[0017] The beneficial effects of the present invention are as follows: the positioning assembly is unfolded by rotating the driving assembly, and the sponge cover is slid into one end of the vibration cylinder. When the sponge cover reaches the inside of the positioning assembly, the driving assembly is released to allow the positioning assembly to limit the sponge cover. The vibration source assembly is powered by a battery, and the vibration source assembly is turned on to make it work. When the vibration source assembly works, the vibration cylinder follows the vibration, and the vibration of the vibration cylinder causes the sponge cover to vibrate and clean the parts of the motor that need to be cleaned, thereby improving the cleaning efficiency of the motor by the staff. The sponge cover can be replaced after the positioning assembly is unfolded by rotating the driving assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] FIG1 is a schematic diagram of the overall structure of a cleaning device for improving the cleaning effect of an electric motor according to the present invention.

[0020] FIG2 is a schematic diagram of the exploded structure of the cleaning device for improving the cleaning effect of the motor according to the present invention.

[0021] FIG3 is a schematic structural diagram of the vibration mechanism of the cleaning device for improving the cleaning effect of the motor according to the present invention.

[0022] FIG4 is a schematic structural diagram of a vibration source assembly of a cleaning device for improving the cleaning effect of an electric motor according to the present invention.

[0023] FIG5 is a schematic structural diagram of the locking mechanism of the cleaning device for improving the cleaning effect of the motor according to the present invention.

[0024] FIG6 is a schematic structural diagram of the positioning assembly of the cleaning device for improving the cleaning effect of the motor according to the present invention.

[0025] FIG. 7 is an enlarged view of A in FIG. 6 of the cleaning device for improving the cleaning effect of the motor according to the present invention.

[0026] FIG8 is a partially enlarged schematic diagram of a cleaning device for improving the cleaning effect of a motor according to the present invention.

[0027] In the figure: 100, vibration mechanism; 101, vibration cylinder; 102, hand handle; 103, vibration source assembly; 103a, spring steel ball; 103a-1, long spring; 103a-2, large steel ball; 103a-3, coupling; 103a-4, short spring 1; 103a-5, small steel ball 1; 103a-6, short spring 2; 103a-7, small steel ball 2; 103b, motor component; 103b-1, motor body; 103b-2, fixing ring; 200, sponge cover; 300, locking mechanism; 301, positioning assembly; 301a, hollow column with groove ;301a-1, hollow column body with groove; 301a-2, movable groove one; 301a-3, movable groove two; 301a-4, connecting plate; 301a-5, guide rod; 301a-6, limiting ring; 301a-7, return spring; 301b, clamping part; 301b-1, clamping plate; 301b-2, positioning hole; 301b-3, paddle one; 301b-4, paddle two; 301c, hexagonal threaded rod; 302, drive assembly; 302a, hollow knob with groove; 302b, push plate one; 302c, slotted block; 302d, push plate two. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0029] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0030] Secondly, the term "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in various places throughout this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive of other embodiments.

[0031] Furthermore, the present invention is described in detail with reference to schematic diagrams. For ease of illustration, when describing the embodiments of the present invention, cross-sectional views illustrating device structures may be partially enlarged and not to scale. Furthermore, the schematic diagrams are merely illustrative and should not limit the scope of protection of the present invention. Furthermore, in actual production, the three-dimensional dimensions of length, width, and depth should be included.

[0032] Example 1

[0033] 1 , a schematic diagram of the overall structure of a cleaning device for improving the cleaning effect of an electric motor is provided. As shown in FIG1-4 , a cleaning device for improving the cleaning effect of an electric motor comprises a vibration mechanism 100, comprising a vibration cylinder 101, a handheld handle 102 mounted at one end of the vibration cylinder 101, a vibration source assembly 103 mounted inside the vibration cylinder 101; a sponge cover 200 located outside the vibration cylinder 101; and a locking mechanism 300 for fixing the position of the sponge cover 200, comprising a positioning assembly 301 mounted outside the vibration cylinder 101, and a driving assembly 302 mounted outside the positioning assembly 301; a battery is installed in the internal limit of the handheld handle 102, and the battery and the vibration source assembly 103 are electrically connected;

[0034] Among them, rotating the drive component 302 causes the positioning component 301 to unfold, and the sponge cover 200 is slid into one end of the vibration tube 101. When the sponge cover 200 reaches the inside of the positioning component 301, loosening the drive component 302 allows the positioning component 301 to limit the sponge cover 200, and the vibration source component 103 is powered by the battery. Turning on the vibration source component 103 allows it to work, and the vibration source component 103 works to make the vibration tube 101 follow the vibration. The vibration of the vibration tube 101 causes the sponge cover 200 to vibrate and clean the parts of the motor that need to be cleaned, thereby improving the staff's cleaning efficiency of the motor; when the sponge cover 200 needs to be replaced, the drive component 302 is rotated to expand the positioning component 301, and the sponge cover 200 can be replaced. This cleaning device is suitable for large 400V low-voltage motors.

[0035] Furthermore, the vibration source assembly 103 includes a spring steel ball 103 a , one end of which is fixedly connected to a motor 103 b ; the motor 103 b is fixedly installed inside the vibration tube 101 .

[0036] Furthermore, the spring steel ball component 103a includes a long spring 103a-1, one end of the long spring 103a-1 is fixedly connected to a large steel ball 103a-2, the other end of the long spring 103a-1 is fixedly connected to a coupling 103a-3, the lower end of the coupling 103a-3 is fixedly connected to a short spring 103a-4, the end of the short spring 103a-4 is fixedly connected to a small steel ball 103a-5, the upper end of the coupling 103a-3 is fixedly connected to a short spring 2 103a-6, the end of the short spring 2 103a-6 is fixedly connected to a small steel ball 2 103a-7; the length of the short spring 2 103a-6 is greater than that of the short spring 103a-4, the diameters of the small steel ball 103a-5 and the small steel ball 2 103a-7 are the same, and the large steel ball 103a-2 is located near the inner end of the vibration tube 101.

[0037] Furthermore, the motor component 103b includes a motor body 103b-1, and a fixing ring 103b-2 is fixedly connected to the outer side of the motor body 103b-1; the motor body 103b-1 is fixedly installed on the inner wall of the vibration tube 101 through the fixing ring 103b-2, and the output end of the motor body 103b-1 is fixedly connected to the coupling 103a-3.

[0038] Operation process: Control the motor body 103b-1 to work. The motor body 103b-1 works so that the coupling 103a-3 drives the long spring 103a-1 and the large steel ball 103a-2 to rotate, so that the vibration tube 101 is hit and vibrated by the large steel ball 103a-2. At the same time, the coupling 103a-3 also drives the small steel ball 103a-5 and the small steel ball 2 103a-7 to rotate through the short spring 1 103a-4 and the short spring 2 103a-6 respectively. The inconsistent lengths of the short spring 1 103a-4 and the short spring 2 103a-6 enable the vibration direction to be balanced in multiple directions, thereby forming a good vibration source. The motor body 103b-1 can be fixedly installed on the inner wall of the vibration tube 101 through the fixing ring 103b-2, so as to work stably.

[0039] Example 2

[0040] 1-5 , this embodiment differs from the first embodiment in that: the positioning assembly 301 includes a grooved hollow column 301a, a plurality of clamping members 301b and a plurality of hexagonal threaded rods 301c, the clamping members 301b are rotated and clamped in the interior of the grooved hollow column 301a through the hexagonal threaded rods 301c; the grooved hollow column 301a is fixedly mounted on the outer wall of the vibration cylinder 101 and close to the hand-held handle 102, and the driving assembly 302 is sleeved on the outside of the grooved hollow column 301a.

[0041] The rest of the structure is the same as that of Example 1.

[0042] Operation process: By rotating the driving assembly 302, the plurality of clamping members 301b can be rotated around the hexagonal threaded rod 301c, so that the sponge cover 200 is fixed or released, thereby making it convenient for the staff to replace the sponge cover 200.

[0043] Example 3

[0044] 1-8 , this embodiment differs from the above embodiments in that the driving assembly 302 includes a slotted hollow knob 302a , to which a plurality of push plates 1 302b , slotted blocks 302c and push plates 2 302d are sequentially fixedly connected.

[0045] Furthermore, the grooved hollow column member 301a includes a grooved hollow column body 301a-1, and the outer side of the grooved hollow column body 301a-1 is provided with several movable grooves 1 301a-2 and several movable grooves 2 301a-3. The outer side of the grooved hollow column body 301a-1 is also fixedly connected to several connecting plates 301a-4, and one side of the connecting plate 301a-4 is also fixedly connected to a guide rod 301a-5, and the end of the guide rod 301a-5 is fixedly connected to a limiting ring 301a-6, and the outer side of the guide rod 301a-5 is also sleeved with a return spring 301a-7; when the grooved block 302c is embedded in the outer side of the guide rod 301a-5, the limiting ring 301a-6 can play a limiting role.

[0046] Furthermore, the clamping member 301b includes a clamping plate 301b-1, a positioning hole 301b-2 is opened at one end of the clamping plate 301b-1, a pick 1 301b-3 is fixedly connected to the outer side of the clamping plate 301b-1 near the positioning hole 301b-2, and a pick 2 301b-4 is also fixedly connected to the outer side of the clamping plate 301b-1 away from the pick 1 301b-3.

[0047] Furthermore, the clamping plate 301b-1 passes through the positioning hole 301b-2 through the hexagonal threaded rod 301c and is rotated to be embedded in the interior of the slotted hollow column body 301a-1. The paddle 1 301b-3 passes through the movable slot 1 301a-2, and the paddle 2 301b-4 passes through the movable slot 2 301a-3; the movable slot 1 301a-2 can accommodate the paddle 1 301b-3 to move inside, and the movable slot 2 301a-3 can accommodate the paddle 2 301b-4 to move inside.

[0048] Furthermore, the grooved hollow knob 302a is sleeved on the outside of the grooved hollow column body 301a-1, and the grooved hollow knob 302a is also limited and blocked by the handle 102. The grooved block 302c is embedded in the outside of the guide rod 301a-5. The grooved block 302c is located between the limiting ring 301a-6 and the return spring 301a-7. The push plate 1 302b is against the paddle 1 301b-3, and the push plate 2 302d is against the paddle 2 301b-4.

[0049] The rest of the structure is the same as that of Example 2.

[0050] Operation process: counterclockwise rotation of the slotted hollow knob 302a can cause several push plates 1 302b, slotted block 302c and push plate 2 302d to rotate accordingly. The rotation of the slotted block 302c compresses the return spring 301a-7 on the connecting plate 301a-4. The rotation of the push plate 1 302b causes the paddle 1 301b-3 to drive the clamping plate 301b-1 to rotate around the hexagonal threaded rod 301c. The rotation of the clamping plate 301b-1 will make it close to the inner wall of the slotted hollow column body 301a-1. The sponge cover 200 can be easily replaced. After the sponge cover 200 is replaced, the grooved hollow knob 302a is released. At this time, the return spring 301a-7 recovers its deformation and causes the grooved hollow knob 302a to rotate clockwise. At this time, the clockwise rotation of the grooved hollow knob 302a will also cause the push plate 2 302d to rotate clockwise. The clockwise rotation of the push plate 2 302d causes the paddle 2 301b-4 to drive the clamping plate 301b-1 to rotate around the hexagonal threaded rod 301c. The rotation of the clamping plate 301b-1 will move away from the inner wall of the grooved hollow column body 301a-1, thereby clamping the sponge cover 200.

[0051] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A cleaning device for improving the cleaning effect of an electric motor, characterized in that: include, The vibration mechanism (100) comprises a vibration tube (101), a hand-held handle (102) installed at one end of the vibration tube (101), and a vibration source component (103) installed inside the vibration tube (101); a sponge sleeve (200) located outside the vibration tube (101); and The locking mechanism (300) for fixing the position of the sponge sleeve (200) comprises a positioning assembly (301) installed on the outside of the vibration tube (101) and a driving assembly (302) installed on the outside of the positioning assembly (301); a battery is installed in the internal limit of the hand-held handle (102), and the battery is electrically connected to the vibration source assembly (103).

2. The cleaning device for improving the cleaning effect of the motor according to claim 1, characterized in that: The vibration source component (103) comprises a spring steel ball component (103a), one end of which is fixedly connected to a motor component (103b); the motor component (103b) is fixedly installed inside the vibration tube (101).

3. The cleaning device for improving the cleaning effect of the motor according to claim 2, characterized in that: The spring steel ball component (103a) comprises a long spring (103a-1), one end of the long spring (103a-1) is fixedly connected to a large steel ball (103a-2), the other end of the long spring (103a-1) is fixedly connected to a coupling (103a-3), the lower end of the coupling (103a-3) is fixedly connected to a short spring (103a-4), the end of the short spring (103a-4) is fixedly connected to a small steel ball (103a-5), The upper end of the coupling (103a-3) is fixedly connected to a second short spring (103a-6), and the end of the second short spring (103a-6) is fixedly connected to a second small steel ball (103a-7); the length of the second short spring (103a-6) is greater than that of the first short spring (103a-4), the diameters of the first small steel ball (103a-5) and the second small steel ball (103a-7) are the same, and the large steel ball (103a-2) is located close to the inner end of the vibration tube (101).

4. The cleaning device for improving the cleaning effect of the motor according to claim 3, characterized in that: The motor component (103b) comprises a motor body (103b-1), and a fixing ring (103b-2) is fixedly connected to the outer side of the motor body (103b-1); the motor body (103b-1) is fixedly installed on the inner wall of the vibration cylinder (101) through the fixing ring (103b-2), and the output end of the motor body (103b-1) is fixedly connected to the coupling (103a-3).

5. The cleaning device for improving the cleaning effect of a motor according to claim 1 or 4, characterized in that: The positioning assembly (301) comprises a hollow column with grooves (301a), a plurality of clamping members (301b) and a plurality of hexagonal threaded rods (301c); the clamping members (301b) are rotatably engaged in the interior of the hollow column with grooves (301a) through the hexagonal threaded rods (301c); the hollow column with grooves (301a) is fixedly mounted on the outer wall of the vibration cylinder (101) and close to the hand-held handle (102); the driving assembly (302) is sleeved on the outer side of the hollow column with grooves (301a).

6. The cleaning device for improving the cleaning effect of the motor according to claim 5, characterized in that: The driving assembly (302) comprises a hollow knob (302a) with a groove, and a plurality of push plates (302b), a slotted clamping block (302c) and a push plate (302d) are fixedly connected in sequence to the hollow knob (302a) with a groove.

7. The cleaning device for improving the cleaning effect of the motor according to claim 6, characterized in that: The grooved hollow column member (301a) comprises a grooved hollow column body (301a-1), the outer side of the grooved hollow column body (301a-1) is provided with a plurality of movable grooves 1 (301a-2) and a plurality of movable grooves 2 (301a-3), the outer side of the grooved hollow column body (301a-1) is also fixedly connected with a plurality of connecting plates (301a-4), one side of the connecting plate (301a-4) is also fixedly connected with a guide rod (301a-5), the end of the guide rod (301a-5) is fixedly connected with a limiting ring (301a-6), and the outer side of the guide rod (301a-5) is also sleeved with a return spring (301a-7).

8. The cleaning device for improving the cleaning effect of the motor according to claim 7, characterized in that: The clamping member (301b) comprises a clamping plate (301b-1), one end of the clamping plate (301b-1) is provided with a positioning hole (301b-2), a first paddle (301b-3) is fixedly connected to a position of the outer side of the clamping plate (301b-1) close to the positioning hole (301b-2), and a second paddle (301b-4) is also fixedly connected to a position of the outer side of the clamping plate (301b-1) away from the first paddle (301b-3).

9. The cleaning device for improving the cleaning effect of a motor according to claim 8, characterized in that: The clamping plate (301b-1) passes through the positioning hole (301b-2) through the hexagonal threaded rod (301c) and then rotates and is embedded in the interior of the grooved hollow column body (301a-1); the paddle 1 (301b-3) passes through the movable groove 1 (301a-2); and the paddle 2 (301b-4) passes through the movable groove 2 (301a-3).

10. The cleaning device for improving the cleaning effect of a motor according to claim 9, characterized in that: The grooved hollow knob (302a) is sleeved on the outer side of the grooved hollow column body (301a-1); the grooved hollow knob (302a) is also limited and blocked by the hand handle (102); the grooved clamping block (302c) is clamped on the outer side of the guide rod (301a-5); the grooved clamping block (302c) is located between the limiting ring (301a-6) and the return spring (301a-7); the push plate 1 (302b) is against the paddle 1 (301b-3); and the push plate 2 (302d) is against the paddle 2 (301b-4).

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