Control valve

Abstract

The utility model discloses a control valve which comprises a shell, a valve body and a pressure regulating assembly. The valve body and the pressure regulating assembly are assembled in the shell. A connecting port is formed in the shell; a valve element is slidably installed in an inner cavity of the valve body. The two ends of the valve element extend out of the valve body, the first end of the valve element extends into the connecting opening, and the second end of the valve element is connected with the pressure adjusting assembly. The valve element is sleeved with an elastic piece, and the two ends of the elastic piece are fixedly connected with the valve element and the valve body respectively. A first hole and a second hole are formed in the valve body, an exhaust hole allowing the second end of the valve element to penetrate through is formed in the valve body, and a gap exists between the exhaust hole and the valve element; a third hole for communicating the exhaust hole with the outside is formed in the pressure regulating assembly; and the inner cavity of the valve body is divided into a plurality of cavities by the convex edges on the valve core, so that the second hole is communicated with the exhaust hole or the first hole. According to the oil pressure change in the connecting port, the second hole is controlled to be communicated with the first hole or the exhaust hole; the preset pressure of the control valve is adjusted through the pressure adjusting assembly.

Description

Technical Field

[0001] This utility model relates to the field of rivet gun technology, specifically to a control valve. Background Technology

[0002] Riveting guns are used for fastening and riveting various metal sheets, pipes, and other materials in the manufacturing industry.

[0003] In the prior art, the rivet gun contains a hydraulic drive device for driving the screw to perform rivet operations. Please refer to [link / reference needed]. Figure 1 As shown, the hydraulic drive device 6 includes, from bottom to top, a cylinder body 61, a first hydraulic cylinder body 63, and a second hydraulic cylinder body 64. The cylinder body 61 houses a cylinder piston 62. The rod of the cylinder piston 62 extends upward into the first hydraulic cylinder body 63, acting as the piston of the first hydraulic cylinder body 63. The second hydraulic cylinder body 64 houses a power output piston 65. The power output piston 65 extends forward outside the second hydraulic cylinder body 64 and connects to the screw inside the riveting gun head. The power output piston 65 is adapted to drive the screw to move back and forth, enabling the screw to perform riveting operations. The inner cavity of the first hydraulic cylinder body 63 is connected to the rod chamber of the second hydraulic cylinder body 64 via a pipe.

[0004] The hydraulic drive unit 6 injects gas into the rodless chamber of the cylinder body 61 to drive the screw in the riveting process. During riveting, the hydraulic drive unit 6 is prone to overload. Specifically, due to factors such as the thickness of the product to be riveted, if the rivet is short, a long riveting distance can damage the rivet. Conversely, if the rivet is long, a short riveting distance can result in insufficient riveting force from the rivet gun. Existing control valves cannot effectively prevent overload of the rivet gun. Furthermore, existing control valves cannot adjust the preset pressure according to the required riveting force of the rivet gun. Utility Model Content

[0005] The technical problem this invention aims to solve is that existing control valves cannot be adapted to rivet guns and cannot effectively prevent rivet gun overload.

[0006] The present invention discloses a control valve suitable for use on a rivet gun, comprising a housing and a valve body and a pressure regulating assembly respectively assembled in the housing;

[0007] The housing is provided with a connection port suitable for communicating with the inner cavity of the oil cylinder;

[0008] A valve core is slidably installed in the inner cavity of the valve body; both ends of the valve core extend out of the valve body, with the first end extending into the connection port and the second end connected to the pressure regulating component.

[0009] An elastic element is sleeved on the valve core; the two ends of the elastic element are fixedly connected to the valve core and the valve body, respectively.

[0010] The valve body has a first hole and a second hole that communicate with its inner cavity. The housing has a first through hole and a second through hole that correspond to the first hole and the second hole, respectively. The valve body has an exhaust hole through which the second end of the valve core passes, and there is a gap between the exhaust hole and the valve core. The pressure regulating assembly has a third hole that connects the exhaust hole to the outside.

[0011] The outer peripheral wall of the valve core is provided with a raised edge to divide the inner cavity of the valve body into multiple cavities, so that the second hole is connected to the exhaust hole or the first hole;

[0012] When the pressure on the first end of the valve core is less than the preset pressure, the second hole is connected to the first hole; otherwise, the second hole is connected to the exhaust hole.

[0013] The pressure regulating component is adapted to adjust the magnitude of the preset pressure. By controlling the oil pressure change in the connection port through the control valve, the position between the valve body and the valve core is adjusted, thereby controlling the connection between the second hole and the first hole or the vent hole, thus protecting the rivet gun and preventing it from being overloaded.

[0014] Optionally, the first hole, the second hole, and the exhaust hole are distributed sequentially along the axial direction of the valve body;

[0015] The convex edge includes a first convex ring and a second convex ring that are spaced apart along the axial direction of the valve body;

[0016] The first convex ring is distributed on the side of the second hole closest to the first hole; the second convex ring is distributed on the side of the second hole closest to the exhaust hole;

[0017] When the pressure on the first end of the valve core is less than the preset pressure, both the first convex ring and the second convex ring are sealed to the inner wall of the valve body. The convex edge divides the inner cavity of the valve body into three non-communicating cavities, with only the first hole and the second hole placed in the same cavity.

[0018] When the pressure on the first end of the valve core is greater than or equal to the preset pressure, only the first convex ring is sealed to the inner wall of the valve body. The first convex ring divides the inner cavity of the valve body into two non-communicating cavities, with only the second hole and the exhaust hole placed in the same cavity.

[0019] The elastic element is placed inside the valve body and located on the side of the second convex ring away from the first convex ring; the first end of the elastic element is fixedly connected to the second convex ring, and its second end is fixedly connected to the inner wall of the valve body. This design allows for control of communication between the second hole and the first hole or the exhaust hole.

[0020] Optionally, the first convex ring is sealed to the inner wall of the valve body by a corresponding O-ring;

[0021] The second convex ring is sealed to the inner wall of the valve body via a corresponding O-ring. This design achieves a sealed fit between the valve core and the valve body.

[0022] Optionally, the pressure regulating assembly includes a base, a rotary rod, and a pressure regulating spring;

[0023] The first end of the base is fitted inside the housing, and the second end of the base extends outside the housing;

[0024] The first end of the rotating rod is placed inside the base and threadedly connected to the base, and the second end of the rotating rod extends outside the base; the third hole is opened at the center of the rotating rod and is arranged along the axial direction of the rotating rod;

[0025] The first end of the pressure regulating spring is fixedly connected to the second end of the valve core, and the second end of the pressure regulating spring abuts against the rotary rod;

[0026] The rotary lever is adapted to adjust the magnitude of the preset pressure. This scheme is adopted to adjust the preset pressure and improve the adaptability of the control valve.

[0027] Optionally, a retaining ring is provided at the second end of the rotating rod to limit its movement. This design prevents the rotating rod from being screwed excessively into the base.

[0028] Optionally, the voltage regulating assembly further includes a retaining ring;

[0029] The retaining ring is sleeved on the base;

[0030] The retaining ring is provided with a limiting protrusion, and the limiting protrusion passes through the base and extends into the base;

[0031] The rotating rod has several positioning concave surfaces along its circumference, which are adapted to cooperate with the limiting protrusions. This design prevents the rotating rod from rotating unexpectedly.

[0032] Optionally, a scale line is provided on the end face of the second end of the base, the scale line being adapted to indicate the magnitude of the preset pressure. This design allows the user to more accurately adjust the preset pressure of the control valve.

[0033] Optionally, the elastic element is a conical spring;

[0034] The compression direction of the elastic element, the sliding direction of the valve core, the axial direction of the valve core, and the compression direction of the pressure regulating spring are all parallel to each other.

[0035] Optionally, the valve core includes a copper slide core and a rod body assembled in the inner cavity of the copper slide core;

[0036] Both ends of the rod extend outside the copper slide core, with its first end extending into the connection port via a top rod, and its second end connected to the pressure regulating component.

[0037] The protrusion is disposed on the outer peripheral wall of the copper slip core.

[0038] Optionally, the outer peripheral wall of the valve body is provided with a plurality of sealing rings, which divide the inner cavity of the housing into a plurality of non-communicating cavities;

[0039] The first through hole and the second through hole are located in different cavities of the housing.

[0040] By adopting the above technical solution, this utility model has the following beneficial effects compared with the prior art:

[0041] The control valve adjusts the position between the valve body and the valve core by changing the oil pressure in the connection port, thereby controlling the connection between the second hole and the first hole or the vent hole, thus protecting the rivet gun and preventing it from being overloaded.

[0042] The control valve adjusts its preset pressure via a pressure regulating component to adapt to the different riveting force requirements of the rivet gun.

[0043] In control valves, the vent hole can be used for both venting and valve core assembly, making it a multi-purpose hole and reducing the manufacturing cost of control valves.

[0044] The above description of the disclosed content and the following description of the embodiments are intended to demonstrate and explain the spirit and principle of the present invention, and to provide a further explanation of the scope of the patent application of the present invention. Attached Figure Description

[0045] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0046] Figure 1 A simplified schematic diagram of a hydraulic drive device;

[0047] Figure 2 This is a cross-sectional schematic diagram of the control valve in this utility model;

[0048] Figure 3 This is a cross-sectional schematic diagram showing the connection between the first hole and the second hole in this utility model;

[0049] Figure 4 This is a cross-sectional schematic diagram showing the connection between the second hole and the exhaust hole in this utility model;

[0050] Figure 5 This is a cross-sectional schematic diagram of the valve body in this utility model;

[0051] Figure 6 This is a cross-sectional schematic diagram of the valve core in this utility model;

[0052] Figure 7 This is a cross-sectional schematic diagram of the voltage regulating component in this utility model;

[0053] Figure 8 This is a partial cross-sectional schematic diagram of the voltage regulating component in this utility model;

[0054] Figure 9 This is a partial schematic diagram of the voltage regulating component in this utility model;

[0055] Figure 10 This is a simplified schematic diagram (a) of the gas flow path when the control valve of this utility model is applied to a hydraulic drive device.

[0056] Figure 11 This is a simplified schematic diagram (II) of the gas flow path when the control valve of this utility model is applied to a hydraulic drive device.

[0057] 1. Housing; 11. Connection port; 12. First through hole; 13. Second through hole;

[0058] 2. Valve body; 21. First hole; 22. Second hole; 23. Vent hole; 24. Sealing ring;

[0059] 3. Valve core; 31. Lug; 311. First convex ring; 312. Second convex ring; 32. Copper slide core; 33. Rod body; 34. Push rod;

[0060] 4. Elastic components;

[0061] 5. Pressure regulating assembly; 51. Base; 52. Rotary rod; 521. Third hole; 53. Pressure regulating spring; 54. Snap ring; 55. Retaining ring;

[0062] 6. Hydraulic drive device; 61. Cylinder body; 62. Cylinder piston; 63. First cylinder body; 64. Second cylinder body; 65. Power output piston. Detailed Implementation

[0063] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model will be presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to this embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived based on the claims of this utility model. To provide a deep understanding of this utility model, many specific details will be included in the following description. This utility model may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0064] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing the utility model 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 limitations on the utility model.

[0065] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0066] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "provided with," "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0067] This application discloses a control valve suitable for use in rivet guns to prevent overload of the hydraulic drive unit 6 of the rivet gun. The hydraulic drive unit 6 is a structure within the rivet gun used to drive the screw of the rivet gun head for rivet operation.

[0068] Please see Figures 2-6As shown, the control valve includes a housing 1, a valve body 2, a valve core 3, an elastic element 4, and a pressure regulating assembly 5. The housing 1 is a hollow structure. The valve body 2 is fixed to the first end of the inner cavity of the housing 1. The pressure regulating assembly 5 is fixed to the second end of the inner cavity of the housing 1. A connection port 11 is provided on the housing 1. The connection port 11 is adapted to communicate with the inner cavity of the hydraulic cylinder. The valve body 2 is a hollow structure. The valve core 3 is slidably mounted in the inner cavity of the valve body 2. The first end of the valve core 3 extends outside the valve body 2 and is placed inside the connection port 11. The second end of the valve core 3 extends outside the valve body 2 and is connected to the pressure regulating assembly 5. An elastic element 4 is sleeved on the middle section of the valve core 3. The first end of the elastic element 4 is fixedly connected to the stepped surface of the valve core 3, and the second end of the elastic element 4 is fixedly connected to the valve body 2. Therefore, when the valve core 3 slides within the valve body 2, the elastic element 4 can expand and contract.

[0069] The valve body 2 has a first hole 21 and a second hole 22. The housing 1 has a corresponding first through hole 12 and a second through hole 13. The first through hole 12 communicates with the first hole 21, and the second through hole 13 communicates with the second hole 22. An exhaust hole 23 is provided at the second end of the valve body 2 for the second end of the valve core 3 to pass through. The first hole 21, the second hole 22, and the exhaust hole 23 are all connected to the inner cavity of the valve body 2. The pressure regulating assembly 5 has a third hole 521 that connects the exhaust hole 23 to the outside. There is a gap between the exhaust hole 23 and the outer wall of the valve core 3 to ensure that the third hole 521 communicates with the inner cavity of the valve body 2 through the exhaust hole 23.

[0070] The outer peripheral wall of the valve core 3 is provided with a flange 31 (e.g. Figure 6 (As shown). The flange 31 is used to divide the inner cavity of the valve body 2 into multiple cavities. With the change in the relative position of the flange 31 and the valve body 2, the second hole 22 is connected to the vent hole 23, or the second hole 22 is connected to the first hole 21. Specifically, the connection or disconnection between the first hole 21, the second hole 22, and the vent hole 23 includes the following two cases:

[0071] Scenario 1: Please refer to Figure 3 As shown, when the oil pressure in the connection port 11 is less than the preset pressure (that is, the pressure on the first end of the valve core 3 is less than the preset pressure), the second hole 22 is connected to the first hole 21; the exhaust hole 23 is in an isolated state, that is, the exhaust hole 23 is not connected to the second hole 22, nor is it connected to the first hole 21.

[0072] Scenario 2: Please refer to Figure 4 As shown, when the oil pressure in the connection port 11 is greater than or equal to the preset pressure (that is, the pressure on the first end of the valve core 3 is greater than or equal to the preset pressure), the second hole 22 is connected to the exhaust hole 23; the first hole 21 is in an isolated state, that is, the first hole 21 is not connected to the second hole 22, nor is it connected to the exhaust hole 23.

[0073] The pressure regulating component 5 is suitable for adjusting the preset pressure to adapt the control valve to different working scenarios.

[0074] In this embodiment, please refer to Figure 1 As shown, the hydraulic drive device 6 includes a cylinder body 61, a cylinder piston 62, a first hydraulic cylinder body 63, a second hydraulic cylinder body 64, a power output piston 65, and an air source for driving the cylinder piston 62. The cylinder piston 62 is slidably disposed within the cylinder body 61, dividing the cylinder body 61 into a rod chamber and a rodless chamber. The rod of the cylinder piston 62 passes sequentially through the cylinder body 61 and the first hydraulic cylinder body 63, extending into the first hydraulic cylinder body 63 to act as the piston of the first hydraulic cylinder body 63. The power output piston 65 is slidably disposed within the second hydraulic cylinder body 64, dividing the second hydraulic cylinder body 64 into a rod chamber and a rodless chamber. The rod of the power output piston 65 extends outside the second hydraulic cylinder body 64. The rod of the power output piston 65 is adapted to drive the screw of the riveting gun head for riveting operations. The inner cavity of the first cylinder body 63 is connected to the rod cavity of the second cylinder body 64 through a pipe.

[0075] Please refer to Figure 10 and Figure 11 As shown, the first port 21 of the control valve is adapted to communicate with the rodless chamber of the cylinder body 61. The second port 22 of the control valve is adapted to be connected to an air source. The connection port 11 of the control valve is adapted to communicate with the inner cavity of the first cylinder body 63 via a pipe.

[0076] The working principle of the control valve in the hydraulic drive device 6 is as follows:

[0077] For the initial state, please refer to [link / reference]. Figure 10 As shown, the rodless chamber of the cylinder body 61 is in its smallest volume state. At this time, the inner cavity of the first cylinder body 63 is under low pressure, and the first port 21 and the second port 22 of the control valve are connected.

[0078] Please see Figure 10 As shown, gas is injected into the second hole 22 by the gas source. The gas passes through the second hole 22 and the first hole 21 in sequence to enter the rodless chamber of the cylinder body 61. As the gas in the rodless chamber of the cylinder body 61 increases, the length of the rod of the cylinder piston 62 extending into the first cylinder body 63 becomes longer. That is, the rod of the cylinder piston 62 occupies more space in the first cylinder body 63, thereby allowing the hydraulic oil in the first cylinder body 63 to enter the rod chamber of the second cylinder body 64 to drive the power output piston 65 to move, thereby driving the screw of the riveting gun head to perform riveting work.

[0079] When the oil pressure inside the first cylinder body 63 is greater than or equal to the preset pressure (i.e., the oil pressure inside the connection port 11 is greater than or equal to the preset pressure), the push rod 34 is forced to move the valve core 3 towards the pressure regulating component 5, so that the third hole 521 is not connected to the first hole 21. At this time, please refer to Figure 11 As shown, the gas injected into the second hole 22 by the air source passes through the exhaust hole 23 and the third hole 521 in sequence to be discharged outside the control valve, that is, the air source is no longer discharged into the cylinder body 61, so as to prevent the hydraulic drive device 6 from being overloaded and effectively protect the hydraulic drive device 6.

[0080] The cylinder body 61, the first oil cylinder body 63, and the second oil cylinder body 64 are arranged sequentially from bottom to top, and the second oil cylinder body 64 is connected to the connection port 11 through the oil outlet at its lower end.

[0081] Furthermore, the first hole 21, the second hole 22, and the exhaust hole 23 are distributed sequentially along the axial direction of the valve body 2.

[0082] For further details, please refer to Figure 3 , Figure 4 and Figure 6 As shown, the convex edge 31 includes a first convex ring 311 and a second convex ring 312 spaced apart along the axial direction of the valve body 2. The first convex ring 311 is located on the side of the second hole 22 closest to the first hole 21. The second convex ring 312 is located on the side of the second hole 22 closest to the exhaust hole 23.

[0083] For details, please refer to Figure 1 As shown, when the pressure on the first end of the valve core 3 is less than the preset pressure, the first convex ring 311 is located on the side of the first hole 21 away from the second hole 22, and the second convex ring 312 is located between the second hole 22 and the exhaust hole 23. At this time, both the first convex ring 311 and the second convex ring 312 are in sealing fit with the inner wall of the valve body 2. The first convex ring 311 and the second convex ring 312 divide the inner cavity of the valve body 2 into three non-communicating cavities. The first hole 21 and the second hole 22 are both located in the same cavity, that is, the second hole 22 is connected to the first hole 21.

[0084] Please see Figure 2 As shown, when the pressure on the first end of the valve core 3 is greater than or equal to the preset pressure, the first convex ring 311 is located between the first hole 21 and the second hole 22, and the second convex ring 312 is located between the second hole 22 and the exhaust hole 23. At this time, only the first convex ring 311 is sealed to the inner wall of the valve body 2, and there is a gap between the second convex ring 312 and the inner wall of the valve body 2. The first convex ring 311 divides the inner cavity of the valve body 2 into two non-communicating cavities, and the second hole 22 and the exhaust hole 23 are located in the same cavity, that is, the second hole 22 and the exhaust hole 23 are connected.

[0085] Furthermore, the first convex ring 311 is sealed to the inner wall of the valve body 2 via a corresponding O-ring. The second convex ring 312 is sealed to the inner wall of the valve body 2 via a corresponding O-ring.

[0086] In this embodiment, the elastic element 4 is placed inside the valve body 2 and is located on the side of the second convex ring 312 away from the first convex ring 311. The first end of the elastic element 4 is fixedly connected to the second convex ring 312, and its second end is fixedly connected to the inner wall of the valve body 2.

[0087] Please see Figure 1 As shown, the pressure regulating assembly 5 includes a base 51, a rotary rod 52, and a pressure regulating spring 53. The first end of the base 51 is fitted inside the housing 1. The second end of the base 51 extends outside the housing 1. The first end of the rotary rod 52 is located inside the base 51 and is threadedly connected to it. The second end of the rotary rod 52 extends outside the base 51. A third hole 521 is formed at the center of the rotary rod 52 and is arranged along the axial direction of the rotary rod 52. The first end of the pressure regulating spring 53 is fixedly connected to the second end of the valve core 3, and the second end of the pressure regulating spring 53 abuts against the rotary rod 52. The rotary rod 52 is adapted to adjust the preset pressure. Specifically, the user can adjust the compression degree of the pressure regulating spring 53 by rotating the rotary rod 52, thereby adjusting the preset pressure of the control valve.

[0088] In this embodiment, the pressure regulating spring 53 is a cylindrical ring spring.

[0089] In this embodiment, the compression direction of the elastic element 4, the sliding direction of the valve core 3, the axial direction of the valve core 3, and the compression direction of the pressure regulating spring 53 are all parallel to each other.

[0090] For further details, please refer to Figure 7 and Figure 9 As shown, the second end of the rotating rod 52 is provided with a retaining ring 55 to limit the rotating rod 52 and prevent the rotating rod 52 from being screwed into the base 51 too much.

[0091] Furthermore, the second end face of the base 51 is provided with scale lines (not shown in the figure), which are suitable for indicating the magnitude of the preset pressure so that the user can more accurately adjust the preset pressure of the control valve.

[0092] For further details, please refer to Figures 7-9 As shown, the pressure regulating assembly 5 also includes a retaining spring 54. The retaining spring 54 is sleeved on the base 51. The retaining spring 54 has a limiting protrusion. The limiting protrusion passes through the base 51 and extends into the base 51. The rotating rod 52 has several positioning concave surfaces circumferentially. The positioning concave surfaces are adapted to cooperate with the limiting protrusions to prevent the rotating rod 52 from rotating accidentally. In this embodiment, the retaining spring 54 has two limiting protrusions, and the rotating rod 52 has six positioning concave surfaces. The positioning concave surfaces elastically abut against the retaining spring 54.

[0093] Please see Figure 3 and Figure 6 As shown, the valve core 3 includes a flange 31, a copper slide core 32, a rod 33, and a push rod 34. The rod 33 is fitted into the inner cavity of the copper slide core 32. Both ends of the rod 33 extend outside the copper slide core 32. The first end of the rod 33 extends into the connection port 11 via the push rod 34, and the second end of the rod 33 is connected to the pressure regulating spring 53. The flange 31 is provided on the outer peripheral wall of the copper slide core 32.

[0094] In this embodiment, the protruding edge 31 and the copper sliding core 32 are an integral structure.

[0095] For further details, please refer to Figure 5 As shown, to ensure that the first through hole 12 and the second through hole 13 do not accidentally connect, a number of sealing rings 24 are provided on the outer peripheral wall of the valve body 2. The sealing rings 24 divide the inner cavity of the housing 1 into a number of non-communicating cavities. The first through hole 12 and the second through hole 13 are located in different cavities of the housing 1.

[0096] In summary, the control valve adjusts the position between the valve body and the valve core by changing the oil pressure in the connection port, thereby controlling the connection between the second hole and the first hole or the vent hole, thus protecting the rivet gun and preventing it from being overloaded. The control valve adjusts its preset pressure through the pressure regulating component to adapt to the different rivet force requirements of the rivet gun. In the control valve, the vent hole can be used for both venting and valve core assembly, serving multiple purposes and reducing the manufacturing cost of the control valve.

[0097] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A control valve suitable for use on a rivet gun, characterized in that, Includes a housing and a valve body and a pressure regulating assembly respectively assembled within the housing; The housing is provided with a connection port suitable for communicating with the inner cavity of the oil cylinder; A valve core is slidably installed in the inner cavity of the valve body; both ends of the valve core extend out of the valve body, with the first end extending into the connection port and the second end connected to the pressure regulating component. An elastic element is sleeved on the valve core; the two ends of the elastic element are fixedly connected to the valve core and the valve body, respectively. The valve body has a first hole and a second hole that communicate with its inner cavity. The housing has a first through hole and a second through hole that correspond to the first hole and the second hole, respectively. The valve body has an exhaust hole through which the second end of the valve core passes, and there is a gap between the exhaust hole and the valve core. The pressure regulating assembly has a third hole that connects the exhaust hole to the outside. The outer peripheral wall of the valve core is provided with a raised edge to divide the inner cavity of the valve body into multiple cavities, so that the second hole is connected to the exhaust hole or the first hole; When the pressure on the first end of the valve core is less than the preset pressure, the second hole is connected to the first hole; otherwise, the second hole is connected to the exhaust hole. The pressure regulating component is adapted to adjust the magnitude of the preset pressure.

2. The control valve according to claim 1, characterized in that, The first hole, the second hole, and the exhaust hole are distributed sequentially along the axial direction of the valve body; The convex edge includes a first convex ring and a second convex ring that are spaced apart along the axial direction of the valve body; The first convex ring is distributed on the side of the second hole closest to the first hole; the second convex ring is distributed on the side of the second hole closest to the exhaust hole; When the pressure on the first end of the valve core is less than the preset pressure, both the first convex ring and the second convex ring are sealed to the inner wall of the valve body. The convex edge divides the inner cavity of the valve body into three non-communicating cavities, with only the first hole and the second hole placed in the same cavity. When the pressure on the first end of the valve core is greater than or equal to the preset pressure, only the first convex ring is sealed to the inner wall of the valve body. The first convex ring divides the inner cavity of the valve body into two non-communicating cavities, with only the second hole and the exhaust hole placed in the same cavity. The elastic element is placed inside the valve body and is located on the side of the second convex ring away from the first convex ring; the first end of the elastic element is fixedly connected to the second convex ring, and its second end is fixedly connected to the inner wall of the valve body.

3. The control valve according to claim 2, characterized in that, The first convex ring is sealed to the inner wall of the valve body by a corresponding O-ring; The second convex ring is sealed to the inner wall of the valve body by a corresponding O-ring.

4. The control valve according to claim 1, characterized in that, The pressure regulating assembly includes a base, a rotary rod, and a pressure regulating spring; The first end of the base is fitted inside the housing, and the second end of the base extends outside the housing; The first end of the rotating rod is placed inside the base and threadedly connected to the base, and the second end of the rotating rod extends outside the base; the third hole is opened at the center of the rotating rod and is arranged along the axial direction of the rotating rod; The first end of the pressure regulating spring is fixedly connected to the second end of the valve core, and the second end of the pressure regulating spring abuts against the rotary rod; The rotary lever is adapted to adjust the magnitude of the preset pressure.

5. The control valve according to claim 4, characterized in that, The second end of the rotating rod is provided with a retaining ring to limit the position of the rotating rod.

6. The control valve according to claim 4, characterized in that, The voltage regulating assembly also includes a retaining ring; The retaining ring is sleeved on the base; The retaining ring is provided with a limiting protrusion, and the limiting protrusion passes through the base and extends into the base; The circumferential direction of the rotating rod is provided with several positioning concave surfaces, which are adapted to cooperate with the limiting protrusion.

7. The control valve according to claim 4, characterized in that, The second end of the base is provided with a scale line, which is adapted to indicate the magnitude of the preset pressure.

8. The control valve according to claim 4, characterized in that, The elastic element is a conical spring; The compression direction of the elastic element, the sliding direction of the valve core, the axial direction of the valve core, and the compression direction of the pressure regulating spring are all parallel to each other.

9. The control valve according to claim 1, characterized in that, The valve core includes a copper slide core and a rod body assembled in the inner cavity of the copper slide core; Both ends of the rod extend outside the copper slide core, with its first end extending into the connection port via a top rod, and its second end connected to the pressure regulating component. The protrusion is disposed on the outer peripheral wall of the copper slip core.

10. The control valve according to claim 1, characterized in that, The outer peripheral wall of the valve body is provided with several sealing rings, which divide the inner cavity of the housing into several non-communicating cavities. The first through hole and the second through hole are located in different cavities of the housing.

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