A device for the metered dispensing of a cleaning substance for an indefinite quantity valve

Abstract

The application discloses a cleaning-substance quantitative dispensing device for an indefinite valve, which comprises a casing, an elastic injection valve and a pressing assembly. The elastic injection valve has a pressing end. The pressing assembly comprises a pressing wheel, a pressing block which is reversibly and reciprocally slidably installed on the casing through an elastic member, and a one-way transmission structure. The one-way transmission structure is used for driving the one-way rotation of the pressing wheel when the pressing block is in a pressing motion and stopping the pressing wheel when the pressing block is in a resetting motion. A plurality of pressing portions are arranged on the outer periphery of the pressing wheel in a ring shape and at intervals. The plurality of pressing portions are arranged to press the pressing end in sequence to make the elastic injection valve inject. In each reciprocating sliding working cycle of the pressing block, the elastic injection valve can realize one-time quantitative dispensing, continuous pressing and continuous injection are avoided, the waste of cleaning substances is reduced, and the user experience is improved.

Description

Technical Field

[0001] This invention relates to the field of cleaning product dispensers, and more particularly to a cleaning product dispensing device for non-dispensing valves. Background Technology

[0002] Currently, most aerosol cans on the market use press-type spray valves that are not metering valves. When the spray valve is in a pre-pressurized state, the contents of the aerosol can are continuously sprayed. Traditional manual dispensing devices used for this type of aerosol can cannot achieve metering function. They can only control the amount of contents sprayed by pressing the spray valve for a certain period of time, which leads to a lot of waste of the contents of the aerosol can. Although some dispensing devices that can achieve metering have appeared on the market, they are complex in structure, cannot be used with the existing press-type non-metering spray valves, and cannot adjust the spray volume. Summary of the Invention

[0003] The purpose of this invention is to provide a device for dispensing cleaning materials in a non-dispensing valve, so as to solve one or more technical problems existing in the prior art, and at least provide a beneficial option or create conditions.

[0004] The technical solution adopted to solve the above-mentioned technical problems is as follows:

[0005] This invention provides a device for dispensing cleaning fluid in a non-quantitative valve, comprising: a housing, an elastic jet valve, and a pressing assembly. The elastic jet valve has a pressing end. The pressing assembly includes a pressing wheel, a pressure block reciprocatingly and slidingly mounted on the housing via an elastic element, and a one-way transmission structure drivingly connected between the pressing wheel and the pressure block. The reciprocating sliding of the pressure block includes mutually opposite pressing and resetting movements. The one-way transmission structure is used to drive the pressing wheel to rotate unidirectionally when the pressure block is in the pressing movement and to stop the pressing wheel when it is in the resetting movement. The pressing wheel has a plurality of pressing parts spaced annularly on its outer periphery, and the plurality of pressing parts are configured to sequentially abut against the pressing end to cause the elastic jet valve to spray.

[0006] The beneficial effects of this invention are as follows: In use, the elastic spray valve is installed at the mouth of the aerosol can. When a quantitative amount of cleaning material needs to be sprayed from the aerosol can, the pressure block is pressed. During the pressing motion of the pressure block from its free state, the pressing wheel is driven to rotate in one direction through the one-way transmission structure. The rotating pressing wheel, through multiple pressing parts on its outer periphery, sequentially abuts against the pressing end on the elastic spray valve. During this process, the elastic spray valve performs one or more spray opening actions, that is, it achieves quantitative distribution. After the pressure block is pressed, it returns to its original position under the restoring force of the elastic element. During this process, the pressing wheel is in a stopped state, and the pressing end does not perform pressing operation, and the elastic spray valve does not perform spraying action. That is to say, for each working cycle of the pressure block's reciprocating sliding, the elastic spray valve can achieve one quantitative distribution, avoiding continuous pressing and continuous spraying, reducing waste of cleaning material and improving the user experience.

[0007] As a further improvement to the above technical solution, the one-way transmission structure includes a driven shaft rotatably installed in the housing, a one-way bearing mounted on the driven shaft, and a driven wheel. The pressing wheel is mounted on the one-way bearing, and the driven wheel is connected to the pressing block in a transmission manner.

[0008] In this design, when the pressure block is pressed and pushed, it drives the driven wheel to rotate, which in turn drives the pressing wheel on the driven shaft to rotate. The pressing wheel is mounted on the driven shaft via a one-way bearing. When the driven shaft rotates in one direction, it drives the pressing wheel to rotate in that direction via the one-way bearing. When the driven shaft rotates in the other direction, the pressing wheel stops due to the contact at the pressing end. In other words, the rotation of the driven wheel relative to the pressing wheel does not affect the resetting movement of the pressure block. During one cycle of the pressure block's reciprocating motion, the pressing wheel can only be driven to rotate during the initial pressing motion. This allows for greater control over the pressing motion of the pressure block during operation. It is equivalent to achieving quantitative distribution immediately after pressing the pressure block, regardless of the duration of pressing. Even if the pressure block is held down continuously, the elastic injection valve will not open to inject.

[0009] As a further improvement to the above technical solution, the driven wheel is a gear, and the pressure block is provided with a rack that meshes with the driven wheel.

[0010] In this design, the pressure block achieves transmission by meshing with the teeth on the outer circumference of the driven wheel through a rack. The meshing transmission between the rack and the gear ensures that slippage will not occur.

[0011] As a further improvement to the above technical solution, the elastic element is a spring, and at least one of the pressure block and the housing is provided with a protrusion that engages with the spring.

[0012] The elastic element in this design is a spring, with the two ends of the spring acting on the pressure block and the housing respectively. In order to prevent the spring from tilting and falling off during the pressing process, a protruding post is set to position the spring.

[0013] As a further improvement to the above technical solution, the pressure block includes a pressure head extending out of the housing and two sliding arms connected side by side at intervals to the inner end of the pressure head. The spring is vertically disposed between the two sliding arms, and the sliding arms slide into the housing.

[0014] The pressure block in this design consists of a pressure head and two sliding arms. The pressure head extends out of the housing, while the two sliding arms slide into the housing. The two sliding arms can also limit the installation of the spring located in the middle.

[0015] As a further improvement to the above technical solution, a sliding groove is provided on the side of the sliding arm, and a guide block that slides and limits the sliding groove is fixed inside the housing.

[0016] To prevent the pressure block from sliding out of the housing, this solution includes a guide block inside the housing that engages with a sliding groove on the side of the sliding arm for sliding limit.

[0017] As a further improvement to the above technical solution, the pressing part is an arc-shaped protrusion structure, and an arc-shaped contact surface is provided on the outer side of the pressing part. In this solution, the pressing part adopts an arc-shaped protrusion structure, and the pressing part contacts the pressing end through the arc-shaped contact surface. This ensures that when the pressing part rotates, it can push the pressing end, allowing the pressing end to smoothly jump onto the next pressing part, facilitating operation and avoiding jamming.

[0018] As a further improvement to the above technical solution, the elastic injection valve is provided with an elastic reset valve core and a pressing swing arm rotatably mounted on the outside of the elastic injection valve. One end of the pressing swing arm is connected to the elastic reset valve core, and the other end of the pressing swing arm is the pressing end.

[0019] This solution uses the swing of a pressing arm to drive the movement of the elastic reset valve core, thereby realizing the injection action of the elastic injection valve. The two ends of the pressing arm act on the end of the elastic reset valve core and the pressing part of the pressing wheel, respectively. The swing center of the pressing arm is set between its two ends, which makes pressing easier and achieves a labor-saving effect. Furthermore, the position of the pressing arm in the free state is determined according to the size of the pressing wheel to ensure that the pressing end is located between two adjacent pressing parts in the free state, so as to ensure that the elastic injection valve is in the closed state after each pressing.

[0020] As a further improvement to the above technical solution, the pressing component also includes a spray volume adjustment structure for adjusting the reciprocating sliding stroke of the pressing block.

[0021] This solution also includes a spray volume adjustment structure to adjust the spray volume. Specifically, the reciprocating sliding stroke of the pressure block is adjusted. Since the reciprocating sliding stroke of the pressure block is related to the rotation angle of the pressing wheel, when a large spray volume is needed, the reciprocating sliding stroke of the pressure block is extended, while when a small spray volume is needed, the reciprocating sliding stroke of the pressure block is shortened.

[0022] As a further improvement to the above technical solution, the injection volume adjustment structure includes an adjustment block slidably installed in the housing. The adjustment block has a first position located at the end of the reciprocating sliding trajectory of the pressure block and a second position located outside the reciprocating sliding trajectory of the pressure block.

[0023] This solution uses an adjusting block to adjust the reciprocating sliding stroke of the pressing block. When it is necessary to shorten the reciprocating sliding stroke of the pressing block, the adjusting block is pushed to the end of the reciprocating sliding track. When the pressing block is pressed and moved to the end, the end of the pressing block will be blocked by the adjusting block, shortening the pressing stroke of the pressing block. When it is necessary to extend the reciprocating sliding stroke of the pressing block, the adjusting block is pushed to the outside of the reciprocating sliding track.

[0024] In some other solutions, the adjustment block can be set as a multi-level stepped structure. Depending on different needs, the adjustment block can be pushed to a set position, and the corresponding step can resist the pressure block to achieve multi-level adjustment. Attached Figure Description

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0026] Figure 1 This is an exploded view of an embodiment of the cleaning agent quantitative dispensing device provided by the present invention;

[0027] Figure 2 This is a schematic diagram of the cleaning agent dispensing device provided by the present invention when it is installed in an aerosol can.

[0028] Figure 3 This is a schematic diagram of one side of the interior of the housing of an embodiment of the cleaning agent dispensing device provided by the present invention.

[0029] Figure 4 This is a schematic diagram of the other side of the casing of an embodiment of the cleaning agent dispensing device provided by the present invention.

[0030] Figure 5 This is a schematic diagram of the cleaning material quantitative distribution device provided by the present invention, which achieves a large spray volume and presses the pressure block after the adjusting block is pushed to the outside of the reciprocating sliding trajectory of the pressure block.

[0031] Figure 6This is a schematic diagram showing the pressure block being pressed down when the adjusting block is pushed to the inner end of the reciprocating sliding trajectory of the pressure block, as the cleaning material quantitative dispensing device provided by the present invention achieves a small spray volume.

[0032] Figure 7 This is a schematic diagram of the cleaning material dispensing device provided by the present invention, in which the pressure block is in a free state when the adjusting block is pushed to the inner end of the reciprocating sliding trajectory of the pressure block. Detailed Implementation

[0033] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0034] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0035] In the description of this invention, if there are words such as "several", they mean one or more, "multiple" means two or more, "greater than", "less than", "exceeding" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself.

[0036] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0037] Reference Figures 1 to 7 The present invention provides the following embodiment of a non-quantitative valve for dispensing cleaning materials:

[0038] The cleaning agent dispensing device of this embodiment includes: a housing 100, an elastic spray valve 200 installed in the housing 100, and a pressing assembly.

[0039] The housing 100 includes a base, a front shell fitted on the front side of the base, and a front shell fitted on the rear side of the base. The front shell and the front shell are connected to the base by screws, so that the front and rear sides inside the housing 100 form an installation chamber.

[0040] The flexible injection valve 200 is installed on the rear side inside the base. The flexible injection valve 200 has an inlet end and an outlet end, and corresponding through holes are provided in the wall of the housing 100 for the inlet and outlet ends to pass through. During use, such as... Figure 2 As shown, the inlet end of the flexible injection valve 200 is connected to the opening of the aerosol can.

[0041] like Figure 4 As shown, the elastic injection valve 200 is also provided with a pressing end 210. By pressing the pressing end 210, the elastic injection valve 200 can be injected. Specifically, the elastic injection valve 200 of this embodiment includes a valve body, an elastic reset valve core installed in the valve body, and a pressing swing arm 220. The specific structure of the valve body and the elastic reset valve core is existing technology. The elastic injection valve 200 can be injected by operating the elastic reset valve core, which is equivalent to the existing press pump structure. The pressing swing arm 220 has a hinge part that is hinged to the outside of the valve body between its two ends. One end of the pressing swing arm 220 is connected to the outer end of the elastic reset valve core, and the other end of the pressing swing arm 220 is the pressing end 210. The swing of the pressing swing arm 220 drives the elastic reset valve core to move, so as to realize the injection action of the elastic injection valve 200. The swing center of the pressing swing arm 220 is set between its two ends, which makes pressing easier and achieves the effect of saving effort.

[0042] The pressing assembly includes a pressing wheel 300, a pressing block 400, and a one-way transmission structure. The pressing wheel 300 and the elastic injection valve 200 are located on the same side. The pressing block 400 is slidably installed in the housing 100, and an elastic element is provided between the pressing block 400 and the housing 100 so that the pressing block 400 can reciprocate within the housing 100 in a resettable manner. The reciprocating sliding of the pressing block 400 includes pressing motion and reset motion that are arranged in opposite directions. The pressing motion is when the pressing block 400 is subjected to an external force and is pressed inward. At this time, the elastic element undergoes elastic deformation to store energy. The reset motion is when the pressing block 400 is released after being pressed and automatically moves back under the reset elastic force of the elastic element.

[0043] The one-way transmission structure connects the pressure block 400 and the pressing wheel 300. The one-way transmission structure allows the pressure block 400 to drive the pressing wheel 300 to rotate in one direction when it is pressing. When the pressure block 400 is resetting, the pressing wheel 300 stops. In other words, within one cycle of the pressure block 400 being pressed, the pressing wheel 300 can only be driven to rotate during the pressing motion.

[0044] In this embodiment, a plurality of pressing parts 310 are provided on the outer periphery of the pressing roller 300. The plurality of pressing parts 310 are arranged in a ring at intervals. The plurality of pressing parts 310 are configured to sequentially abut against the pressing end 210 to cause the elastic injection valve 200 to spray.

[0045] In this embodiment, the pressure block 400 includes an integrally formed pressure head 430 and two sliding arms 440. The two sliding arms 440 are connected side-by-side at intervals to the inner end of the pressure head 430. The pressure head 430 extends out of the housing 100, while the two sliding arms 440 slide into the housing 100. In this embodiment, the elastic element is a spring 800. The two ends of the spring 800 act on the pressure block 400 and the housing 100, respectively. The spring 800 is vertically arranged between the two sliding arms 440. One end of the spring 800 acts on the inner end of the pressure head 430, while the spring 800 acts on the abutment platform inside the housing 100. In this embodiment, a protrusion 420 is provided at the inner end of the pressure head 430. The protrusion 420 fits with the spring 800 to position the spring 800 and prevent the spring 800 from tilting and dislodging during the pressing process. The two sliding arms 440 can also limit the installation of the spring 800 located in the middle.

[0046] In other embodiments, the protrusion 420 may be provided on the abutment platform inside the housing 100, or both may be provided with the protrusion 420.

[0047] To prevent the pressure block 400 from sliding out of the housing 100, a sliding groove 441 is provided on the side of the sliding arm 440, and a guide block 110 is fixed inside the housing 100. The guide block 110 can slide and limit the sliding groove 441.

[0048] When a measured amount of cleaning material needs to be sprayed from the aerosol can, the pressure block 400 is pressed. As the pressure block 400 moves from its free state, it drives the pressing wheel 300 to rotate in one direction via a one-way transmission structure. The rotating pressing wheel 300, through multiple pressing parts 310 on its outer periphery, sequentially abuts against the elastic pressing end 210 on the elastic spray valve 200. During this process, the elastic spray valve 200 performs one or more spray opening actions, thus achieving a measured amount of cleaning material. After the pressure block 400 is pressed, it returns to its original position under the restoring force of the elastic element. During this process, the pressing wheel 300 is in a stopped state, and the elastic pressing end 210 does not perform a pressing operation, nor does the elastic spray valve 200 perform a spraying action. In other words, for each reciprocating sliding cycle of the pressure block 400, the elastic spray valve 200 can achieve one measured amount of cleaning material, avoiding continuous pressing and spraying, reducing waste of cleaning material, and improving the user experience.

[0049] The one-way transmission structure in this embodiment includes a driven shaft 500, a one-way bearing 600, and a driven wheel 700. The driven shaft 500 is rotatably installed inside the housing 100. The one-way bearing 600 and the driven wheel 700 are respectively sleeved on both ends of the driven shaft 500. The pressing wheel 300 is sleeved on the one-way bearing 600, and the driven wheel 700 is connected to the pressing block 400 in a transmission connection.

[0050] When the pressure block 400 is pressed and pushed, it drives the driven wheel 700 to rotate, which in turn drives the pressing wheel 300 on the driven shaft 500 to rotate. The pressing wheel 300 is mounted on the driven shaft 500 via a one-way bearing 600. When the driven shaft 500 rotates in one direction, it drives the pressing wheel 300 to rotate in that direction via the one-way bearing 600. When the driven shaft 500 rotates in the other direction, the pressing wheel 300 stops due to the contact of the elastic pressing end 210. In other words, the driven wheel at this time... The rotation of the pressure roller 300 relative to the pressure block 400 does not affect the reset movement of the pressure block 400. During the reciprocating motion of the pressure block 400 in one cycle, the pressure roller 300 can only be driven to rotate during the initial pressing motion. When operating, people have a higher degree of control over the pressing motion of the pressure block 400. It is equivalent to achieving quantitative distribution after pressing the pressure block 400, which is not related to the pressing time. Even if the pressure block 400 is held down, the elastic injection valve 200 will not open to spray.

[0051] Specifically: Regarding the transmission connection between the driven wheel 700 and the pressure block 400, in this embodiment, the driven wheel 700 is configured as a gear, and the pressure block 400 is provided with a rack 410, which meshes with the driven wheel 700.

[0052] In other embodiments, the driven wheel 700 and the pressure block 400 can be connected by a transmission structure of friction wheel and friction surface, which can also convert the linear motion of the pressure block 400 into the rotation of the driven wheel 700.

[0053] In this embodiment, the pressure block 400 achieves transmission by meshing the rack 410 with the teeth on the outer periphery of the driven wheel 700. The meshing transmission between the rack 410 and the gear ensures that slippage will not occur.

[0054] In this embodiment, the pressing part 310 adopts an arc-shaped protrusion structure. An arc-shaped contact surface is provided on the outer side of the pressing part 310. The pressing part 310 contacts the elastic pressing end 210 through the arc-shaped contact surface. This ensures that when the pressing part 310 rotates, it can push the elastic pressing end 210, so that the elastic pressing end 210 can smoothly jump to the next pressing part 310, which is convenient for operation and avoids jamming.

[0055] The position of the pressing arm 220 in its free state is determined by the size of the pressing wheel 300 to ensure that the pressing end 210 is located between two adjacent pressing parts 310 in its free state, so as to ensure that the elastic injection valve 200 is in the closed state after each pressing.

[0056] Furthermore, the pressing assembly also includes a spray volume adjustment structure, which is used to adjust the reciprocating sliding stroke of the pressing block 400. Since the reciprocating sliding stroke of the pressing block 400 is related to the rotation angle of the pressing wheel 300, when a large spray volume is required, the reciprocating sliding stroke of the pressing block 400 is extended, while when a small spray volume is required, the reciprocating sliding stroke of the pressing block 400 is shortened.

[0057] Specifically: The spray volume adjustment structure includes an adjustment block 900, which is slidably installed inside the housing 100. For ease of operation, an operation groove is provided on the wall of the housing 100, and the adjustment block 900 is provided with a toggle element located in the operation groove.

[0058] The adjustment block 900 has a first gear and a second gear at both ends of its sliding trajectory. When the adjustment block 900 is in the first gear, it is pushed to the end of the reciprocating sliding trajectory of the pressure block 400. When the adjustment block 900 is in the second gear, it is pushed to the outside of the reciprocating sliding trajectory of the pressure block 400.

[0059] like Figure 5 , Figure 6 and Figure 7 As shown, in this embodiment, the reciprocating sliding stroke of the pressure block 400 is adjusted by adjusting block 900. When it is necessary to shorten the reciprocating sliding stroke of the pressure block 400, the adjusting block 900 is pushed to the end of the reciprocating sliding track. When the pressure block 400 is pressed and moved to the end, the end of the pressure block 400 will be blocked by the adjusting block 900, shortening the pressing stroke of the pressure block 400. When it is necessary to extend the reciprocating sliding stroke of the pressure block 400, the adjusting block 900 is pushed to the outside of the reciprocating sliding track.

[0060] In some other solutions, the adjusting block 900 can be configured as a multi-level stepped structure. Depending on different needs, the adjusting block 900 can be pushed to a set position so that the corresponding step can resist the pressure block 400, thereby achieving multi-level adjustment.

[0061] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A device for dispensing cleaning materials in a non-dispensing valve, characterized in that: It includes: Casing (100); A resilient injection valve (200) having a press end (210); The pressing assembly includes a pressing wheel (300), a pressure block (400) reciprocally slidably mounted on the housing (100) via an elastic element, and a one-way transmission structure drivingly connecting the pressing wheel (300) and the pressure block (400). The reciprocating sliding of the pressure block (400) includes pressing motion and reset motion in opposite directions. The one-way transmission structure is used to cause the pressure block (400) to drive the pressing wheel (300) to rotate unidirectionally when it is in the pressing motion, and to stop the pressing wheel (300) when it is in the reset motion. The pressing wheel (300) is provided with a plurality of pressing parts (310) at intervals around its outer periphery. The plurality of pressing parts (310) are configured to abut against the pressing end (210) in sequence to cause the elastic injection valve (200) to spray. The pressing block (400) includes a pressing head (430) extending out of the housing (100) and two sliding arms (440) connected side by side at intervals to the inner end of the pressing head (430). The elastic element is vertically arranged between the two sliding arms (440), and the sliding arms (440) slide into the housing (100).

2. The cleaning agent dispensing device for a non-dispensing valve according to claim 1, characterized in that: The one-way transmission structure includes a driven shaft (500) rotatably mounted in the housing (100), a one-way bearing (600) fitted on the driven shaft (500), and a driven wheel (700). The pressing wheel (300) is fitted on the one-way bearing (600), and the driven wheel (700) is connected to the pressing block (400) in a transmission connection.

3. The cleaning agent dispensing device for a non-dispensing valve according to claim 2, characterized in that: The driven wheel (700) is a gear, and the pressure block (400) is provided with a rack (410) that meshes with the driven wheel (700).

4. The cleaning agent dispensing device for a non-dispensing valve according to claim 1, characterized in that: The elastic element is a spring (800), and at least one of the pressure block (400) and the housing (100) is provided with a protrusion (420) that engages with the spring (800).

5. A cleaning agent dispensing device for a non-dispensing valve according to claim 1, characterized in that: A sliding groove (441) is provided on the side of the sliding arm (440), and a guide block (110) is fixed inside the housing (100) to slide and limit the sliding groove (441).

6. A cleaning agent dispensing device for a non-dispensing valve according to claim 1, characterized in that: The pressing part (310) is an arc-shaped protrusion structure, and an arc-shaped contact surface is provided on the outer side of the pressing part (310).

7. A cleaning agent dispensing device for a non-dispensing valve according to claim 6, characterized in that: The elastic injection valve (200) is provided with an elastic reset valve core and a pressing arm (220) rotatably mounted on the outside of the elastic injection valve (200). One end of the pressing arm (220) is connected to the elastic reset valve core, and the other end of the pressing arm (220) is the pressing end (210).

8. A cleaning agent dispensing device for a non-dispensing valve according to any one of claims 1 to 7, characterized in that: The pressing assembly also includes a spray volume adjustment structure for adjusting the reciprocating sliding stroke of the pressing block (400).

9. A cleaning agent dispensing device for a non-dispensing valve according to claim 8, characterized in that: The spray volume adjustment structure includes an adjustment block (900) slidably installed in the housing (100). The adjustment block (900) has a first position located at the end of the reciprocating sliding trajectory of the pressure block (400) and a second position located outside the reciprocating sliding trajectory of the pressure block (400).

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