Angle sensor for electronic plunger pump and electronic plunger pump

Abstract

The utility model relates to the technical field of hydraulic pressure, in particular to an angle sensor for an electronic plunger pump and the electronic plunger pump. An angle sensor for an electronic plunger pump is used for detecting the deflection angle of a swash plate of the electronic plunger pump, the swash plate is arranged in a shell of the electronic plunger pump, the angle sensor comprises a positioning plate, the first end of the positioning plate is fixed to the swash plate, and the second end of the positioning plate is detachably provided with a mounting base; the mounting seat is rotationally assembled in the mounting opening of the shell, the mounting seat is coaxial with the deflection axis of the swash plate, and a magnetic head is mounted on the mounting seat; and the cover plate assembly is detachably mounted on the mounting opening, and the cover plate assembly is provided with a magnetic sensing module opposite to the magnetic head. The technical problems that in the prior art, a plunger pump adopts a carrying torque transmission non-contact angle sensor, the size is large, and dismounting and mounting are not convenient are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulics, and particularly relates to an angle sensor for an electronic plunger pump and an electronic plunger pump. Background Art

[0002] A hydraulic pump is an energy conversion device in a hydraulic system, serving as the power source in the system. It drives a load to do work for an actuator, converting the mechanical energy input by a motor into hydraulic energy. A swashplate type plunger pump realizes liquid suction and pressure by changing the volume in the plunger cylinder through the reciprocating movement of the plunger in the cylinder bore. The motor drives the plunger pump to rotate, and the plunger moves back and forth in the cylinder block bore, causing the volume of the cavity between the plunger and the cylinder block bore to change, thus completing the suction and discharge oil conversion. The rotating assembly of the swashplate type plunger pump forms a certain angle with the swashplate, and changing the angle causes the displacement of the plunger pump to change.

[0003] For a swashplate type plunger pump, the displacement and output flow of the pump can be changed by changing the swashplate swing angle. Therefore, the size of the pump output flow can also be realized by monitoring the swashplate swing angle of the pump. As Figures 1-3 shown, for an existing plunger pump equipped with a torque transmission non-contact angle sensor 5' that can achieve constant power, pressure, and displacement control through a controller 2', the host computer 1' inputs pressure, power, and displacement commands to the controller 2'. The controller 2' generates an output signal based on the feedback signals of the outlet pressure sensor 3' and the angle sensor 5' of the plunger pump 4', and inputs it to the electro-hydraulic proportional displacement control valve 8' of the plunger pump 4', thereby realizing the control of the pump output power, pressure, and flow.

[0004] Figure 2 Shown is a structural component of an existing angle sensor. The angle sensor body 51' and the gasket 52' are installed on the mounting block 54' by screws. The fork 55' is connected to the angle sensor body 51' through an adapter plate 53' and fastened with a set screw 56', which can ensure that the fork 55' and the angle sensor body 51' rotate by the same angle.

[0005] Figure 3 Shown is the installation diagram of the angle sensor 5' and the swashplate of the plunger pump. A connecting pin 411' is installed on the end face of one side of the swashplate 41'. The fork 55' is connected by screws. When the swing angle of the swashplate 41' changes, the fork 55' rotates, driving the angle sensor body 51' to rotate together, and the feedback signal of the angle sensor body 51' changes.

[0006] Under the existing control structure, the controller of the plunger pump still includes a mechanical feedback structure, such as a constant power control valve 8' and a pressure cut-off control valve 7'. When using an upper computer 1' to control the pump, mechanical feedback interference and a large inertial resistance will still be generated. The electro-hydraulic proportional displacement control valve 6' has a low frequency response, which will affect the variable response and control accuracy of the pump. The variable pressure of the plunger pump 4' is affected by the outlet pressure P of the pump. Different outlet pressures will cause the pump to exhibit different variable responses, increasing the control difficulty of the controller 2'. The angle sensor assembly fork 55' and the angle sensor body 51' are fastened by two set screws 56'. If there is a gap between its end face and the angle sensor body 51' or the fork 55', the angle transmission error will increase, thereby affecting the control accuracy of the controller 2'. If the angle sensor body 51' is damaged, the screw 57' needs to be disassembled and the set screw 56' needs to be loosened before the angle sensor body 51' can be disassembled. A large disassembly and replacement space needs to be provided, and good replaceability cannot be achieved. Summary of the Invention

[0007] In order to solve the technical problem that the existing plunger pump with a torque transmission non-contact angle sensor has a large volume and is inconvenient to disassemble and assemble, the present invention provides an angle sensor for an electronic plunger pump and an electronic plunger pump, which solve the above technical problems.

[0008] In order to solve the above technical problems, the present invention provides an angle sensor for an electronic plunger pump, which is used to detect the swash plate deflection angle of the electronic plunger pump. The swash plate is built into the housing of the electronic plunger pump. The angle sensor includes:

[0009] A positioning plate, the first end of the positioning plate is fixed on the swash plate, and the second end of the positioning plate is detachably installed with a mounting seat;

[0010] A mounting seat, the mounting seat is rotationally assembled in the mounting opening of the housing, the deflection axes of the mounting seat and the swash plate are coaxial, and a magnetic head is installed on the mounting seat;

[0011] A cover plate assembly, the cover plate assembly is detachably installed on the mounting opening, and the cover plate assembly is configured with a magnetic sensitive module opposite to the magnetic head.

[0012] According to an embodiment of the present invention, the first end of the positioning plate is fixed on the swash plate by means of a positioning pin and a positioning screw.

[0013] According to an embodiment of the present invention, at least one cylindrical pin is provided between the first end of the mounting seat and the second end of the positioning plate. A through center hole is provided in the middle of the mounting seat. The end of the center hole close to the positioning plate is a screw hole, and a locking screw passes through the screw hole to fix the mounting seat to the positioning plate.

[0014] According to an embodiment of the present invention, the magnetic head is detachably mounted on the end face of the second end of the mounting seat by means of screws.

[0015] According to an embodiment of the present invention, a positioning groove is provided in the mounting opening, and a sealing assembly is provided between the positioning groove and the mounting seat.

[0016] According to an embodiment of the present invention, the sealing assembly includes a gasket, an oil seal and a snap ring. The gasket is placed at the bottom of the positioning groove, the oil seal and the snap ring are arranged on the gasket, and the oil seal is deformed under the action of the snap ring to seal.

[0017] According to an embodiment of the present invention, the cover plate assembly includes:

[0018] A first cover plate that seals the mounting opening, and a magnetic sensor module is arranged on the outer side of the first cover plate, and a gap is left between the first cover plate and the magnetic head;

[0019] A second cover plate that seals the outer side of the magnetic sensor module, and the second cover plate is locked to the first cover plate by means of screws and pads.

[0020] The present invention also provides an electronic plunger pump, which includes an angle sensor for detecting the swing angle of the swash plate.

[0021] According to an embodiment of the present invention, it further includes:

[0022] A proportional regulating valve for regulating the output power, pressure and flow rate of the pump;

[0023] An outlet pressure sensor for detecting the outlet pressure of the electronic plunger pump;

[0024] A controller for controlling the proportional regulating valve;

[0025] An upper computer that receives the feedback signals of the angle sensor and the pressure sensor, and controls the proportional regulating valve through the controller according to the feedback signals.

[0026] According to an embodiment of the present invention, the angle sensor is a non-contact Hall sensor.

[0027] Based on the above technical solutions, the technical effects that the present invention can achieve are:

[0028] 1. The angle sensor of the present utility model includes a positioning plate, a positioning seat and a cover plate assembly, with a simple structure and a small volume. During installation, the positioning plate can be assembled on the swash plate, and then the swash plate and the positioning plate are assembled into the shell of the electronic plunger pump. The mounting seat extends into the mounting plate from the mounting opening of the shell, and finally the cover plate assembly is covered. The assembly is simple. When the angle sensor fails and needs to be repaired, the cover plate assembly can be removed first, and then the mounting seat can be removed from the mounting opening of the shell. There is no need to open the entire shell to disassemble and repair the angle sensor from the inside of the shell. The space required for disassembly, assembly and replacement is small, and the disassembly and assembly are convenient.

[0029] 2. In the angle sensor of the present utility model, the positioning plate is fixed on the swash plate through a positioning pin and a positioning screw, which can fix the relative position of the positioning plate and the swash plate, so that the second end of the positioning plate is located on the deflection axis of the swash plate. When the mounting seat is fixed at the second end of the positioning plate, the axis of the mounting seat is collinear with the deflection axis of the swash plate.

[0030] 3. In the angle sensor of the present utility model, a cylindrical pin is arranged between the mounting seat and the positioning plate, which can position the relative position of the mounting seat and the positioning plate and ensure the concentricity of the installation of the mounting seat. By arranging a through screw hole in the middle of the mounting seat, the locking screw can extend from the mounting opening into the screw hole to fix the mounting seat on the positioning plate, which is convenient for the disassembly and assembly of the mounting seat.

[0031] 4. In the angle sensor of the present utility model, a positioning groove is arranged in the mounting opening, which can position the position of the mounting seat and ensure the concentricity of the mounting seat. And the mounting seat only makes a rotational movement driven by the swash plate and the positioning plate. A sealing component is assembled in the positioning groove, which can realize the sealing between the angle sensor and the shell. The gasket, oil seal and retaining ring can also jointly form an anti-pollution structure of the angle sensor, which can prevent impurities from being adsorbed on the magnetic head through the installation gap when the shell returns oil. In addition, compared with the rotational installation structure of the bearing, the sealing component composed of the gasket, oil seal and retaining ring is convenient for disassembly and assembly.

[0032] 5. In the angle sensor of the present utility model, the cover plate assembly includes a first cover plate and a second cover plate. The first cover plate can seal the mounting opening, and the second cover plate and the cushion block are installed outside the magnetic sensitive module to play an anti-seismic and protective role.

[0033] 6. The electronic plunger pump of the present utility model uses the aforementioned angle sensor to detect the swing angle of the swash plate, and uses a proportional regulating valve to control the flow rate, pressure and power of the plunger pump. Only the pilot external oil control is used to control the variable of the plunger pump, which avoids the influence of the mechanical feedback structure and the internal control pressure fluctuation on its variable response. And the proportional regulating valve has high precision and small leakage, and the control precision and response of the plunger pump are greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is the hydraulic schematic diagram of the swash plate type plunger pump in the prior art;

[0035] Figure 2 It is a schematic structural diagram of an angle sensor assembled on a swash plate in the prior art;

[0036] Figure 3 It is a sectional view of an angle sensor in the prior art;

[0037] Figure 4 It is a schematic structural diagram of an electronic plunger pump of the present utility model;

[0038] Figure 5 It is Figure 4 The enlarged view of part A in

[0039] Figure 6 It is a sectional view when the angle sensor is assembled on the swash plate of the electronic plunger pump;

[0040] Figure 7 It is Figure 6 The enlarged view of part B in

[0041] Figure 8 It is an exploded view of the angle sensor assembled on the swash plate;

[0042] Figure 9 It is a state diagram when part of the structure of the angle sensor is assembled on the swash plate;

[0043] Figure 10 It is a hydraulic schematic diagram of a swash plate type plunger pump of the present utility model;

[0044] In the figure: 1 - angle sensor; 11 - positioning plate; 111 - positioning screw; 112 - positioning pin; 12 - mounting seat; 121 - locking screw; 122 - cylindrical pin; 13 - magnetic head; 14 - cover plate assembly; 141 - first cover plate; 142 - second cover plate; 143 - spacer block; 15 - magnetic sensitive module; 16 - sealing assembly; 161 - gasket; 162 - oil seal; 163 - retaining ring; 17 - screw; 2 - electronic plunger pump; 21 - housing; 211 - mounting port; 212 - positioning groove; 22 - swash plate; 3 - proportional regulating valve; 4 - outlet pressure sensor; 5 - controller; 6 - host computer; 7 - variable piston; 1' - host computer; 2' - controller; 3' - outlet pressure sensor; 4' - plunger pump; 41' - swash plate; 411' - connecting pin; 5' - angle sensor; 51' - angle sensor body; 52' - gasket; 53' - adapter plate; 54' - mounting block; 55' - fork; 56' - set screw; 57' - screw; 6' - electro-hydraulic proportional displacement control valve; 7' - pressure cut-off control valve; 8' - constant power control valve. Detailed implementation mode

[0045] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present utility model and its application or use. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0046] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0047] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present utility model. At the same time, it should be understood that for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0048] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by orientation words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal", and "top, bottom" are usually based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Without contrary description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus should not be construed as limiting the scope of protection of the present utility model; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0049] For ease of description, spatial relative terms such as "above", "over", "on the upper surface", "upper" etc. can be used here to describe the spatial positional relationship of a device or feature shown in the figure with other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figure for the device. For example, if the device in the attached drawing is inverted, the device described as "above or over other devices or structures" will then be positioned "below or under other devices or structures". Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations are made for the spatial relative descriptions used here.

[0050] In addition, it should be noted that the use of terms such as "first", "second" etc. to define components is only for the convenience of differentiating the corresponding components. Without further statement, the above terms have no special meaning, and thus should not be construed as limiting the protection scope of the present utility model.

[0051] As Figures 4-10 shown, this embodiment provides an angle sensor 1 for an electronic plunger pump. There is a swash plate 22 arranged inside the electronic plunger pump. The angle sensor 1 is used to detect the deflection angle of the swash plate 22 to obtain the angle information of the swash plate 22.

[0052] The angle sensor 1 includes a positioning plate 11, a mounting seat 12, a magnetic head 13, a cover plate assembly 14 and a magnetic sensitive module 15. The positioning plate 11 is fixed on the swash plate 22. The mounting seat 12 is detachably assembled on the positioning plate 11. The magnetic head 13 is assembled at one end of the mounting seat 12 away from the positioning plate 11. The cover plate assembly 14 is assembled on the housing 21 of the electronic plunger pump to play a sealing role; the magnetic sensitive module 15 is assembled in the cover plate assembly 14. The magnetic sensitive module 15 is arranged opposite to the magnetic head 13. The mounting seat 12 is located on the deflection axis of the swash plate 22. When the mounting seat 12 rotates with the swash plate 22, the mounting seat 12 drives the magnetic head 13 to rotate together, and the magnetic sensitive module 15 can generate an angle feedback signal.

[0053] The positioning plate 11 plays a role in positioning and assembling the mounting seat 12. The positioning plate 11 is plate-shaped. The first end of the positioning plate 11 is fixed on the outer side wall of the swash plate 22. The second end of the positioning plate 11 extends to pass through the deflection axis of the swash plate 22 to facilitate the assembly of the mounting seat 12.

[0054] As a preferred technical solution of this embodiment, the first end of the positioning plate 11 positions its position relative to the swash plate 22 by means of positioning pins 112, and the first end of the positioning plate 11 is fixed to the swash plate 22 by positioning screws 111. Preferably, there are at least two positioning pins 112. In this embodiment, two positioning pins 112 are provided, and the two positioning pins 112 are symmetrically arranged on both sides of the positioning screw 111. The positioning pin 112 can be, but is not limited to, a cylindrical pin.

[0055] The mounting seat 12 is assembled to the second end of the positioning plate 11. The mounting seat 12 can be set as a hollow structure, and the fastening structure can extend into the interior of the mounting seat 12 to fix the mounting seat 12 to the second end of the positioning plate 11.

[0056] As a preferred technical solution of this embodiment, a through central hole is provided in the middle of the mounting seat 12. One end of the central hole close to the positioning plate 11 is a screw hole. The fastening structure can include a locking screw 121. The locking screw 121 can extend from the central hole, pass through the screw hole to fix the mounting seat 12 to the positioning plate 11.

[0057] As a preferred technical solution of this embodiment, the first end of the mounting seat 12 is arranged close to the second end of the positioning plate 11. At least one cylindrical pin 122 is provided between the first end of the mounting seat 12 and the second end of the positioning plate 11. The cylindrical pin 122 can play a role in positioning the mounting seat 12 between the mounting seat 12 and the positioning plate 11. In this embodiment, two cylindrical pins 122 are provided, and the two cylindrical pins 122 are symmetrically arranged on both sides of the locking screw 121.

[0058] As a preferred technical solution of this embodiment, the mounting seat 12 is assembled perpendicular to the positioning plate 11. The mounting seat 12 is assembled on the side of the positioning plate 11 away from the swash plate 22. When the angle sensor 1 is applied to the electronic plunger pump 2, a mounting port 211 is provided at the position corresponding to the mounting seat 12 on the housing 21 of the electronic plunger pump 2, and the mounting seat 12 can rotate within the mounting port 211.

[0059] The magnetic head 13 is assembled to the second end of the mounting seat 12. The magnetic head 13 can be detachably assembled to the end face of the second end of the mounting seat 12 by screws 17.

[0060] The cover plate assembly 14 is detachably mounted on the housing 21 of the electronic plunger pump 2. Specifically, the cover plate assembly 14 is assembled on the outer surface of the housing 21 and covers the mounting port 211. The cover plate assembly 14 includes a first cover plate 141, a second cover plate 142 and a spacer block 143. The first cover plate 141 seals the mounting port 211. A magnetic sensor module 15 is disposed outside the first cover plate 141. A screw 17 can pass through the magnetic sensor module 15 and the first cover plate 141 to detachably assemble the magnetic sensor module 15 and the first cover plate 141 on the housing 21. A gap is left between the inner side of the first cover plate 141 and the magnetic head 13. The second cover plate 142 and the first cover plate 141 are separated by the spacer block 143. The second cover plate 142 is locked to the first cover plate 141 by the screw 17. The magnetic sensor module 15 is located between the first cover plate 141 and the second cover plate 142. The second cover plate 142 and the spacer block 143 can provide anti-seismic protection for the magnetic sensor module 15.

[0061] To ensure the installation accuracy and sealing performance of the mounting seat 12, a positioning groove 212 is further provided in the mounting port 211, and a sealing assembly 16 is provided between the positioning groove 212 and the mounting seat 12. In addition to ensuring the sealing between the oil in the inner cavity of the housing and the outside, the sealing assembly 16 also has a dust-proof function. When the plunger pump is in use and the hydraulic system is connected to the external oil drain port of the housing 21, the sealing assembly 16 can prevent impurities such as iron filings carried by the circulating return oil from being adsorbed on the magnetic head 13, which affects the response and feedback accuracy of the magnetic sensor module 15.

[0062] Among them, the positioning groove 212 surrounds the mounting seat 12. The positioning groove 212 is a stepped groove extending on the inner wall of the mounting port 211. The opening of the positioning groove 212 faces outward, which is convenient for the disassembly and assembly of the sealing assembly 16. The sealing assembly 16 includes a gasket 161, an oil seal 162 and a retaining ring 163. The oil seal 162 is located between the gasket 161 and the retaining ring 163. The oil seal 162 contacts the outer peripheral wall of the mounting seat 12 to achieve the sealing between the housing 21 and the magnetic head 13, and prevent impurities during the oil return of the housing 21 from being adsorbed on the magnetic head 13 through the mounting gap. The gasket 161 is placed at the bottom of the positioning groove 212, and the gasket 161 plays a role in supporting and positioning the oil seal 162. The retaining ring 163 realizes the installation limit of the oil seal 161. The retaining ring 163 can be selected but is not limited to a hole-type snap ring.

[0063] The angle sensor 1 can detect the angle of the swash plate 22 of the electronic plunger pump 2. The angle sensor 1 is preferably a non-contact Hall sensor.

[0064] This embodiment also provides an electronic piston pump 2, which includes the aforementioned angle sensor 1, and also includes a proportional regulating valve 3, an outlet pressure sensor 4, a controller 5, a host computer 6, and a variable piston 7. The controller 5 receives the pressure, power, and displacement commands issued by the host computer 6, monitors the feedback signals of the outlet pressure sensor 4 and the angle sensor 1 of the electronic piston pump 2, compares the deviation between the command signal and the feedback signal, and outputs a signal to control the proportional regulating valve 3 to act, so as to realize the control of the pump output power, pressure, and flow rate. When the electronic piston pump 2 is running normally, the host computer 6 sends pressure, power, and displacement signals to the controller 5. Through the internal logic operation of the controller 5, when the control takes effect, the controller 5 monitors the swing angle feedback signal in real time. If the electronic piston pump 2 does not reach the displacement specified by the input signal, the controller 5 inputs an analog signal to the proportional regulating valve 3, the valve port opens, the pilot control oil at port G flows to the variable piston 7, and the displacement of the electronic piston pump 2 changes. The angle sensor 1 feeds back the signal to the controller 5 until the pump displacement reaches the specified swing angle of the input signal. During the process of maintaining the swing angle constant, the controller 5 will keep the proportional regulating valve 3 in a dynamic adjustment process to maintain the pressure of the variable piston 7.

[0065] As a preferred technical solution of this embodiment, the proportional regulating valve 3 is a high-frequency response proportional valve with higher control accuracy. The controller is used to realize the control of the piston pump flow rate, pressure, and power through the high-frequency response proportional valve. Only the pilot external oil control is used to control the piston pump variable, avoiding the influence of the mechanical feedback structure and the internal control pressure fluctuation on its variable response. Moreover, the high-frequency response proportional valve has high precision and small leakage, greatly improving the control precision and response of the piston pump.

[0066] The electronic plunger pump 2 of this embodiment has high control precision and the angle sensor 1 is convenient to disassemble and assemble. When assembling the angle sensor 1, the first end of the positioning plate 11 can be fixed to the swash plate 22 first. A cylindrical pin 122 is provided at the second end of the positioning plate 11. The positioning plate 11 and the swash plate 22 are assembled into the housing 21 together. Then, the mounting seat 12 and the positioning plate 11 are positioned through the cylindrical pin 122 from the mounting port 211. The locking screw 121 extends from the central hole of the mounting seat 12 and passes through the screw hole to fix the mounting seat 12 on the positioning plate 11. Then, the magnetic head 13 is assembled at the second end of the mounting seat 12 through the screw 17, and the sealing assembly 16 is assembled into the positioning groove 212. Then, the first cover plate 141 is covered at the mounting port 211. The magnetic sensor module 15 is located outside the first cover plate 141. The screw 17 passes through the magnetic sensor module 15 and the first cover plate 141 to fix the two on the housing 21 and cover the mounting port. There is a gap between the first cover plate 141 and the magnetic head 13. The magnetic sensor module 15 is arranged opposite to the magnetic head 13. Finally, the second cover plate 142 is arranged outside the magnetic sensor module 15 through the spacer 143, and the screw 17 fixes the second cover plate 142 on the first cover plate 141. When disassembling, the components can be removed in the reverse order of installation. When disassembling and maintaining structures such as the magnetic head 13 and the mounting seat 12, it can be achieved through the mounting port 211 without disassembling the whole plunger pump, which is convenient for disassembly and assembly.

[0067] The size of the gap between the magnetic head 13 and the first cover plate 141 can be adjusted through the mounting seat 12. The gap size between the two can be adjusted by selecting mounting seats 12 with different axial lengths.

[0068] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the gist of the present invention.

Claims

1. An angle sensor for an electronic plunger pump, which is used to detect the deflection angle of a swash plate (22) of the electronic plunger pump (2), the swash plate (22) being built into a housing (21) of the electronic plunger pump (2), and is characterized in that, The angle sensor (1) includes: A positioning plate (11), the first end of the positioning plate (11) is fixed on the swash plate (22), and a mounting seat (12) is detachably installed at the second end of the positioning plate (11); A mounting seat (12), the mounting seat (12) is rotatably assembled in the mounting opening (211) of the housing (21), the deflection axes of the mounting seat (12) and the swash plate (22) are coaxial, and a magnetic head (13) is installed on the mounting seat (12); A cover plate assembly (14), the cover plate assembly (14) is detachably installed on the mounting opening (211), and the cover plate assembly (14) is configured with a magnetic sensitive module (15) opposite to the magnetic head (13).

2. The angle sensor for an electronic plunger pump according to claim 1, characterized in that, The first end of the positioning plate (11) is fixed on the swash plate (22) by means of a positioning pin (112) and a positioning screw (111).

3. The angle sensor for an electronic plunger pump according to claim 1 or 2, characterized in that, At least one cylindrical pin (122) is provided between the first end of the mounting seat (12) and the second end of the positioning plate (11), a through central hole is provided in the middle of the mounting seat (12), the end of the central hole close to the positioning plate (11) is a screw hole, and a locking screw (121) passes through the screw hole to fix the mounting seat (12) to the positioning plate (11).

4. An angle sensor for an electronic plunger pump according to claim 1, characterized in that, The magnetic head (13) is detachably installed on the end face of the second end of the mounting seat (12) by means of a screw (17).

5. An angle sensor for an electronic plunger pump according to claim 1, characterized in that, A positioning groove (212) is provided in the mounting opening (211), and a sealing assembly (16) is provided between the positioning groove (212) and the mounting seat (12).

6. The angle sensor for an electronic plunger pump according to claim 5, wherein The sealing assembly (16) includes a gasket (161), an oil seal (162) and a retaining ring (163), the gasket (161) is placed at the bottom of the positioning groove (212), the oil seal (162) and the retaining ring (163) are arranged on the gasket (161), and the oil seal (162) is deformed under the action of the retaining ring (163) to seal.

7. An angle sensor for an electronic plunger pump according to claim 2, characterized in that, The cover plate assembly (14) includes: A first cover plate (141), the first cover plate (141) seals the mounting opening (211), the magnetic sensitive module (15) is arranged on the outer side of the first cover plate (141), and a gap is left between the first cover plate (141) and the magnetic head (13); A second cover plate (142), the second cover plate (142) seals the outer side of the magnetic sensitive module (15), and the second cover plate (142) is locked to the first cover plate (141) by means of a screw (17) and a spacer (143).

8. An electronic plunger pump, characterized in that, An angle sensor (1) as claimed in claim 1 is included, and the angle sensor (1) is used to detect the swing angle of the swash plate (22).

9. An electronic plunger pump according to claim 8, characterized in that, It further includes: A proportional regulating valve (3) for regulating the output power, pressure and flow rate of the pump; An outlet pressure sensor (4) for detecting the outlet pressure of the electronic plunger pump (2); A controller (5) for controlling the proportional regulating valve (3); An upper computer (6), the upper computer (6) receives the feedback signals of the angle sensor (1) and the pressure sensor, and controls the proportional regulating valve (3) through the controller (5) according to the feedback signals.

10. An electronic plunger pump according to claim 8, characterized in that, The angle sensor (1) is a non-contact Hall sensor.

Images