Variable hydraulic pump load regulator facilitating machining and installation

Abstract

The utility model relates to hydraulic pump control technical field, specifically disclose a variable hydraulic pump load regulator convenient to processing and installation, to solve the existing regulator valve body casting high cost, interface easy misloading, pressure regulation easy loosening problem. It includes valve body, and the valve body is by cuboid blank mechanical processing, and opens load sensitive valve element chamber, pressure cut -out valve element chamber and main oil way, and the external interface contains load feedback control mouth, high pressure mouth P, low pressure mouth T etc., wherein many interfaces are located in the same installation datum plane and asymmetric distribution, and the different specifications, can also contain double nut interlocking adjusting screw, multiple O -ring sealing structure etc. The utility model dispenses with the casting process and reduces the cost and improves the efficiency, and the interface design prevents misloading, and the double nut guarantees pressure stability, and the adaptability is strong, is applicable to variable axial piston pump.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic pump control technology, specifically to a variable hydraulic pump load regulator for variable axial piston pumps that integrates load sensing and pressure cut-off functions and is easy to process and install. Background Technology

[0002] Variable displacement hydraulic pumps are the core power components of hydraulic systems, and the performance of their regulators directly determines the system's energy consumption, control accuracy, and reliability. Currently, the widely used integrated load regulators integrate the load-sensing valve and the pressure shut-off valve into the same valve body, achieving pump displacement control through a mechanical-hydraulic mechanism.

[0003] However, existing integrated load regulators have the following technical drawbacks: ① High production cost and long cycle: Existing regulator valve bodies mostly use irregularly shaped castings. Irregularly shaped castings require custom molds, which are expensive and cannot flexibly change the external dimensions to adapt to different models of variable pumps. At the same time, after casting, complex processes such as sand removal and preliminary aging treatment are required, resulting in a long production cycle and a relatively high scrap rate due to the influence of the casting process.

[0004] ② Poor process adaptability: It is difficult to ensure the consistency between the internal flow channels formed by casting and the datum of subsequent machining. The alignment during the machining process is difficult, which seriously affects the machining accuracy and efficiency and cannot meet the needs of high-precision hydraulic systems.

[0005] ③Low installation tolerance: The external oil port interfaces of existing regulator valve bodies are usually symmetrical or nearly symmetrically distributed, lacking an effective design to prevent misinstallation; if the pipeline connection is incorrect during on-site installation, it can easily lead to the entire hydraulic system failing to work properly, or even cause equipment failure, increasing installation and commissioning costs.

[0006] ④ Insufficient adjustment stability: The pressure adjusting screw is fixed by only a single locking nut. During the long-term operation of the hydraulic system, the locking nut is easily loosened due to severe pressure fluctuations and mechanical vibrations, causing the preset pressure value to drift. This requires frequent readjustment of the regulator, resulting in a large workload for maintenance and affecting the reliability of continuous equipment operation. Utility Model Content

[0007] This utility model aims to overcome the shortcomings of the prior art and provide a variable hydraulic pump load regulator with low processing cost, short production cycle, flexible adjustment of external dimensions, high installation fault tolerance and strong operational stability, so as to solve the problems of high production cost, poor process adaptability, easy misinstallation and / or easy pressure regulation drift of the existing regulator.

[0008] To achieve the above-mentioned technical objectives, the technical solution adopted by this utility model is as follows: A variable displacement hydraulic pump load regulator, designed for easy machining and installation, includes a valve body. The valve body is machined from a rectangular blank, maintaining its standard rectangular outline. The valve body contains a load-sensing valve core cavity, a pressure-cutting valve core cavity, and a main oil passage, integrating load sensing and pressure cut-off functions. The valve body also has several external interfaces for connecting hydraulic pipelines. These external interfaces include a load feedback control port, a screw-limiting port, a high-pressure port, a low-pressure port, and a working port leading to an actuator. The screw-limiting port, high-pressure port, low-pressure port, and working port are all located on the same mounting reference surface of the valve body and are asymmetrically distributed, with each port having different specifications, types, or quantities. This asymmetrical distribution and unique differences in specifications / types / quantities of the external interfaces prevent mis-installation during pipeline connections, facilitating installation.

[0009] Furthermore, it also includes an end cap, a first adjusting screw, a second adjusting screw, and adjusting nuts; the end cap is fixedly connected to the valve body by bolts, and the end cap has internal threads that mate with the first adjusting screw and the second adjusting screw respectively; two adjusting nuts are connected in series on each of the first adjusting screw and the second adjusting screw, and the two adjusting nuts interlock with each other to form a mechanical interlock. This is to resist vibration and pressure fluctuations in the hydraulic system and prevent the preset pressure value from drifting due to loosening of the first adjusting screw and the second adjusting screw.

[0010] Furthermore, it also includes sealing rings, plugs, and a throttle valve core; the sealing rings include a first O-ring, a second O-ring, a third O-ring, and a fourth O-ring; the first O-ring is disposed at the radial fit gap between the valve body and the throttle valve core to seal the assembly gap between the two; the second O-ring is disposed at the edge of the contact surface between the high-pressure port, low-pressure port, and working port of the valve body and the pump housing; the third O-ring is disposed at the edge of the contact surface between the screw limiting port of the valve body and the large limiting block; and the fourth O-ring is disposed at the edge of the contact surface between the load feedback control port of the valve body and the small limiting block. Multi-position sealing rings achieve oil sealing at each connection point, preventing oil leakage from affecting system operation.

[0011] Furthermore, the throttle valve core has a stepped shaft structure. One end of the throttle valve core mates with an external interface of the valve body, and a throttle orifice is provided in the middle of the throttle valve core. The diameter of the throttle orifice can be adjusted according to the flow stabilization requirements of different load conditions. In this way, the flow requirements of different load conditions can be adapted by replacing the throttle valve core with a different throttle orifice diameter, without the need to replace the entire regulator.

[0012] Furthermore, a sealing gasket is provided at the mating point between the screw plug and the external interface of the valve body. The sealing gasket is a flat rubber gasket with a thickness of 1mm. This prevents oil from leaking from the threaded gap to the outside of the valve body and affecting its function.

[0013] Furthermore, the load feedback control port uses an M12×1.25 thread, the high-pressure port uses a 3.5mm bore, the low-pressure port uses a 6.5mm bore, the working port uses a 5mm bore, and the screw limit port uses a 12mm or 20mm bore. All external interfaces, including the high-pressure, low-pressure, and working ports, are connected to the main oil passage within the valve body, enabling oil flow between the main oil passage and external pipelines. Through clearly defined thread specifications or bore diameter differences and the connection design of the main oil passage, the identification of external interfaces against misinstallation and the rationality of oil flow are further enhanced, ensuring that installers can quickly and accurately connect the pipelines.

[0014] Furthermore, it also includes a load-sensitive valve core, a pressure-cut-off valve core, a large limit block, a small limit block, a large spring seat, a small spring seat, an inner flow spring, an outer flow spring, an inner pressure spring, and an outer pressure spring; the load-sensitive valve core is assembled in the load-sensitive valve core cavity of the valve body, and the pressure-cut-off valve core is assembled in the pressure-cut-off valve core cavity of the valve body; the end of the first adjusting screw contacts the large limit block, and the end of the second adjusting screw contacts the small limit block; an inner pressure spring and an outer pressure spring are provided between the large limit block and the large spring seat, and an inner flow spring and an outer flow spring are provided between the small limit block and the small spring seat; the groove surface of the large spring seat mates with the pressure-cut-off valve core, and the groove surface of the small spring seat mates with the load-sensitive valve core. This structure achieves coordinated control of load sensing and pressure-cut-off functions.

[0015] Furthermore, the groove surfaces of both the large and small spring seats are arc-shaped, and the curvature of the arc-shaped structure is adapted to the end curvature of the load-sensitive valve core and the pressure-cut-off valve core, respectively. This arc-shaped surface fit ensures uniform force distribution within the load-sensitive valve core cavity and the pressure-cut-off valve core cavity, preventing valve core wear caused by contact stress concentration and extending the service life of the components.

[0016] Furthermore, when adapted to variable displacement hydraulic pumps with a displacement of 0.5-80 mL / r, the length of the valve body can be adjusted within the range of 100-200 mm, and the width within the range of 40-100 mm. During the adjustment process, the relative positions of the load-sensitive valve core cavity, the pressure-cutting valve core cavity, and the main oil passage within the valve body remain consistent with the machining datum. No redesign of the machining datum is required; this can be achieved simply by modifying the CNC machining program, further improving the valve body's machining adaptability and efficiency.

[0017] Compared with the prior art, the present invention has the following beneficial technical effects: 1. Significantly improved processing and adaptability Abandoning the traditional irregular-shaped casting valve body process, a rectangular blank is machined, maintaining the standard rectangular shape of the valve body: no custom casting molds are required, significantly reducing production costs and production cycle; the valve body dimensions can be flexibly adjusted, and during the adjustment process, the relative positions of the load-sensitive valve core cavity, pressure-cutting valve core cavity, and main oil passage within the valve body remain consistent with the machining datum. Adaptation can be achieved simply by modifying the CNC machining program, greatly improving machining adaptability and efficiency; avoiding the problem of "inconsistency between casting flow channels and machining datum", reducing the difficulty of machining alignment, and effectively ensuring machining accuracy.

[0018] 2. Significantly enhanced installation fault tolerance The screw limit ports, high-pressure ports, low-pressure ports, and working ports on the same mounting reference surface of the valve body are asymmetrically distributed, and the specifications, types, and quantities of each interface are different. Through the design of "spatial distribution differences + interface differences", the misinstallation of pipeline connections is prevented from the source, significantly improving installation fault tolerance and reducing hydraulic system failures and debugging costs caused by pipeline misconnection.

[0019] 3. Stronger long-term stability in pressure regulation The first and second adjusting screws adopt a "double adjusting nut series interlocking" structure: after the two adjusting nuts are tightened, they squeeze and lock together to form a mechanical interlock, which can effectively resist the vibration and pressure fluctuation of the hydraulic system; it avoids the defect of easy loosening of the traditional "single locking nut", prevents the adjustment screw from causing the preset pressure value to drift, greatly improves the long-term stability of pressure regulation, reduces the frequency of equipment maintenance and debugging, and ensures the continuous and reliable operation of the hydraulic system.

[0020] 4. Superior sealing reliability and wear control Sealing Design: A multi-dimensional sealing structure consisting of a first O-ring, a second / third / fourth O-ring, and a rubber gasket at the plug ensures comprehensive reliability of the oil seal and prevents leakage from affecting system operation. Wear Control: The grooves of the large and small spring seats are designed with an arc shape, and their curvature matches the end curvature of the load-sensitive valve core and the pressure shut-off valve core, ensuring uniform force distribution on the valve core and reducing wear caused by stress concentration. Hydraulic oil grooves are provided on the outer periphery of the load-sensitive valve core and the pressure shut-off valve core to further reduce wear between the valve core and the valve body cavity wall, extending component lifespan.

[0021] 5. Higher flexibility in current stability adaptation The throttle valve core has a stepped shaft structure, and the diameter of the throttle orifice in the middle can be adjusted according to the load conditions: only by replacing the throttle valve core with a different throttle orifice diameter, it can be adapted to the flow stabilization requirements of different load conditions without replacing the entire regulator; this improves the product's adaptability to various operating conditions and reduces the cost of use and maintenance. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model.

[0023] Figure 2 yes Figure 1 The front view.

[0024] Figure 3 yes Figure 2 Sectional view at point AA. Detailed Implementation

[0025] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the paper. This orientation or positional relationship is only for the convenience of describing this utility model and simplifying the description, and does 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, and therefore should not be construed as a limitation of this utility model.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "communication" 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 communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] 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. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0028] like Figure 1-3 The variable displacement hydraulic pump load regulator shown is easy to process and install, including a valve body 2. The valve body 2 is machined from a cuboid blank and its outer contour remains a standard cuboid. The valve body 2 has a load-sensitive valve core cavity, a pressure-cut-off valve core cavity, and a main oil passage for integrating load sensing and pressure cut-off functions. The valve body 2 is provided with several external interfaces for connecting hydraulic pipelines. The external interfaces include a load feedback control port LS, a screw limit port, a high-pressure port P, a low-pressure port T, and a working port O leading to the actuator. The screw limit port, high-pressure port P, low-pressure port T, and working port O are all located on the same mounting reference surface of the valve body 2 and are asymmetrically distributed. At the same time, their specifications, types, or quantities are different.

[0029] The so-called installation reference plane is a unified plane on the valve body 2 specifically used for integrating external interfaces and serving as a reference for pipeline installation and positioning. In this embodiment, the installation reference plane is... Figure 2 The face where AA is located. This embodiment uses a valve body structure of "machining of a cuboid blank + maintaining a standard cuboid outline", which eliminates casting molds and complex processes, reduces costs and shortens the cycle, while ensuring uniform machining datum; by setting the screw limit port, high pressure port P, low pressure port T, and working port O as the same installation datum plane with asymmetrical distribution and different specifications / types / quantities, the incorrect installation of pipelines is eliminated from the physical structure, ultimately achieving a dual improvement in machining convenience and installation fault tolerance, and there is no need to redesign the valve body basic structure when adapting to different variable pumps.

[0030] In another preferred embodiment, the system further includes an end cap 10, a first adjusting screw 12, a second adjusting screw 13, and adjusting nuts 11. The end cap 10 is fixedly connected to the valve body 2 by bolts 14, and the end cap 10 has internal threads that mate with the first adjusting screw 12 and the second adjusting screw 13 respectively. Two adjusting nuts 11 are connected in series on both the first adjusting screw 12 and the second adjusting screw 13, and the two adjusting nuts 11 interlock with each other to form a mechanical interlock. Addressing the problem in the prior art where the pressure adjusting screw is fixed by only a single nut and is prone to loosening due to vibration, leading to pressure drift, this embodiment uses two interlocking adjusting nuts 11 connected in series on the first adjusting screw 12 and the second adjusting screw 13 to form a mechanical interlock structure. This effectively resists vibration and pressure fluctuations in the hydraulic system, prevents the adjusting screw from loosening, ensures long-term stability of the preset pressure value, reduces the frequency of equipment maintenance and debugging, and improves the reliability of continuous operation of the hydraulic system.

[0031] In another preferred embodiment, a sealing ring, a screw plug 4, and a throttle valve core 8 are also included; the sealing ring includes a first O-ring 9, a second O-ring 17, a third O-ring 20, and a fourth O-ring 21; the first O-ring 9 is disposed at the radial fit gap between the valve body 2 and the throttle valve core 8 to seal the assembly gap between the two; the second O-ring 17 is disposed at the edge of the contact surface between the high pressure port P, the low pressure port T, and the working port O of the valve body 2 and the pump housing; the third O-ring 20 is disposed at the edge of the contact surface between the screw limiting port of the valve body 2 and the large limiting block 15; and the fourth O-ring 21 is disposed at the edge of the contact surface between the load feedback control port LS of the valve body 2 and the small limiting block 16. To address the problem of insufficient sealing points and easy oil leakage at various connection parts of the regulator in the prior art, this embodiment uses a first O-ring 9 to seal the fit gap between the valve body 2 and the throttle valve core 8, and a second O-ring 17, a third O-ring 20, and a fourth O-ring 21 to seal the fit gap between different external interfaces and the screw plug 4 or the large / small limit blocks 15 and 16, respectively, to construct a multi-dimensional sealing system, comprehensively blocking the oil leakage path and avoiding the impact of leakage on the operational stability of the hydraulic system.

[0032] In another preferred embodiment, the throttling valve core 8 is a stepped shaft structure. One end of the throttling valve core 8 mates with the external interface of the valve body 2, and a throttling orifice is provided in the middle of the throttling valve core 8. The diameter of the throttling orifice is adjusted according to the flow stabilization requirements of different load conditions. Addressing the problems of existing technologies requiring complete replacement of the regulator for flow regulation, poor adaptability, and high maintenance costs, this embodiment sets the throttling valve core 8 as a stepped shaft structure. One end mates with the valve body 2, and the middle is provided with a throttling orifice whose diameter can be adjusted as needed. Only valve cores with different throttling orifice diameters need to be replaced to adapt to the flow stabilization requirements of different load conditions, eliminating the need to replace the entire regulator. This significantly improves the flexibility of flow adaptation and reduces usage and maintenance costs.

[0033] In another preferred embodiment, a sealing gasket 1 is further provided at the mating point between the screw plug 4 and the external interface of the valve body 2. The sealing gasket 1 is a flat rubber gasket with a thickness of 1 mm. Addressing the problem of single sealing at the mating point between the screw plug and the valve body in the prior art, which is prone to leakage due to thread gaps, this embodiment adds a 1 mm thick rubber sealing gasket 1 at the mating point between the screw plug 4 and the external interface of the valve body 2. This enhances the sealing reliability of the screw plug mating point and prevents oil from leaking from the thread gaps to the outside of the valve body.

[0034] In another preferred embodiment, the load feedback control port LS uses an M12×1.25 thread, the high-pressure port P uses a 3.5mm aperture, the low-pressure port T uses a 6.5mm aperture, the working port O uses a 5mm aperture, and the screw limiting port uses a 12mm or 20mm aperture. Furthermore, the high-pressure port P, low-pressure port T, and working port O of each external interface are all connected to the main oil passage within the valve body 2, enabling oil flow between the main oil passage and external pipelines. Addressing the problem in existing technologies where unclear external interface specifications lead to poor identification of mis-installation and unreasonable oil flow paths, this embodiment clearly defines the specifications of each interface, such as the load feedback control port LS and the high-pressure port P, strengthening mis-installation identification through significant specification differences. Simultaneously, the high-pressure port P, low-pressure port T, and working port O are connected to the main oil passage, ensuring smooth oil flow between the main oil passage and external pipelines, avoiding incorrect pipeline connections and guaranteeing the hydraulic system's oil flow efficiency.

[0035] In another preferred embodiment, the system further includes a load-sensitive valve core 5, a pressure shut-off valve core sharing the same specification as the load-sensitive valve core, a large limit block 15, a small limit block 16, a large spring seat 7, a small spring seat 6, an inner flow spring 23, an outer flow spring 22, an inner pressure spring 19, and an outer pressure spring 18. The load-sensitive valve core 5 is assembled in the load-sensitive valve core cavity of the valve body 2, and the pressure shut-off valve core is assembled in the pressure shut-off valve core cavity of the valve body 2. The end of the first adjusting screw 12 contacts the large limit block 15, and the end of the second adjusting screw 13 contacts the small limit block 16. An inner pressure spring 19 and an outer pressure spring 18 are provided between the large limit block 15 and the large spring seat 7, and an inner flow spring 23 and an outer flow spring 22 are provided between the small limit block 16 and the small spring seat 6. The groove surface of the large spring seat 7 mates with the pressure shut-off valve core, and the groove surface of the small spring seat 6 mates with the load-sensitive valve core 5. To address the issues of low integration and poor coordinated control of load sensing and pressure cut-off functions in existing technologies, this embodiment assembles the load sensing valve core 5 and the pressure cut-off valve core into their respective valve core cavities. The first adjusting screw 12 and the second adjusting screw 13 respectively push the large limit block 15 and the small limit block 16, and then the force is transmitted to the valve core through the spring and spring seat, achieving efficient integration and coordinated operation of the two functions—the load sensing function maintains a constant pressure difference to match the flow rate, and the pressure cut-off function limits the system pressure to ensure safety, thereby improving the controller's control accuracy and system safety.

[0036] In another preferred embodiment, the groove surfaces of both the large spring seat 7 and the small spring seat 6 are arc-shaped, and the curvature of the arc-shaped structure is adapted to the end curvature of the load-sensitive valve core 5 and the pressure-cut-off valve core, respectively. Addressing the problem of stress concentration and easy wear of the valve core caused by contact between the spring seat and the valve core in the prior art, this embodiment sets the groove surfaces of the large spring seat 7 and the small spring seat 6 to arc-shaped structures, and the curvature is adapted to the end curvature of the load-sensitive valve core 5 and the pressure-cut-off valve core. This ensures uniform force distribution when the valve core and the spring seat are in contact, avoids valve core wear caused by localized stress concentration, extends the service life of the valve core and the spring seat, and reduces the frequency of component replacement.

[0037] In another preferred embodiment, when adapting to a variable displacement hydraulic pump with a displacement of 0.5-80 mL / r, the length of the valve body 2 can be adjusted within the range of 100-200 mm, and the width can be adjusted within the range of 40-100 mm. Furthermore, during the size adjustment process, the relative positions of the load-sensitive valve core cavity, the pressure-cut-off valve core cavity, and the main oil passage within the valve body 2 remain consistent with the machining datum. Addressing the problem in existing technologies where the valve body size is fixed and the machining datum needs to be redesigned when adapting to variable displacement pumps of different displacements, this embodiment sets the length of the valve body 2 to an adjustable range of 100-200 mm and the width to 40-100 mm, adapting to variable displacement pumps with a displacement of 0.5-80 mL / r. Moreover, during size adjustment, the relative positions of the load-sensitive valve core cavity, the pressure-cut-off valve core cavity, and the main oil passage remain consistent with the machining datum. This eliminates the need for datum redesign; adaptation can be achieved simply by modifying the CNC program, significantly improving the adaptability and efficiency of valve body machining and reducing the cost of adapting to multiple pump models.

[0038] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A variable hydraulic pump load regulator that is easy to process and install, comprising a valve body (2), characterized in that, The valve body (2) is machined from a rectangular blank and its outer contour remains a standard rectangular prism. The valve body (2) has a load-sensitive valve core cavity, a pressure-cut-off valve core cavity and a main oil passage for integrating load-sensitive and pressure-cut-off functions. The valve body (2) is provided with several external interfaces for connecting hydraulic pipelines. The external interfaces include a load feedback control port (LS), a screw limit port, a high-pressure port (P), a low-pressure port (T) and a working port (O) leading to the actuator. The screw limit port, high-pressure port (P), low-pressure port (T) and working port (O) are all located on the same mounting reference surface of the valve body (2) and are asymmetrically distributed. Their specifications, types or quantities are different from each other.

2. The variable hydraulic pump load regulator that is easy to process and install according to claim 1, characterized in that, It also includes an end cap (10), a first adjusting screw (12), a second adjusting screw (13), and an adjusting nut (11); the end cap (10) is fixedly connected to the valve body (2) by bolts (14), and the end cap (10) is provided with internal threads that respectively cooperate with the first adjusting screw (12) and the second adjusting screw (13); two adjusting nuts (11) are connected in series on the first adjusting screw (12) and the second adjusting screw (13), and the two adjusting nuts (11) are pressed and locked together to form a mechanical interlock.

3. The variable hydraulic pump load regulator that is easy to process and install according to claim 1, characterized in that, It also includes a sealing ring, a screw plug (4), and a throttle valve core (8); the sealing ring includes a first O-ring (9), a second O-ring (17), a third O-ring (20), and a fourth O-ring (21); the first O-ring (9) is located at the radial fit gap between the valve body (2) and the throttle valve core (8) to seal the assembly gap between the two; the second O-ring (17) is located at the edge of the contact surface between the high pressure port (P), low pressure port (T), and working port (O) of the valve body (2) and the pump casing; the third O-ring (20) is located at the edge of the contact surface between the screw limit port of the valve body (2) and the large limit block (15); and the fourth O-ring (21) is located at the edge of the contact surface between the load feedback control port (LS) of the valve body (2) and the small limit block (16).

4. The variable hydraulic pump load regulator that is easy to process and install according to claim 3, characterized in that, The throttle valve core (8) has a stepped shaft structure. One end of the throttle valve core (8) is connected to the external interface of the valve body (2). The throttle valve core (8) has a throttle hole in the middle. The diameter of the throttle hole is adjusted according to the flow stabilization requirements of different load conditions.

5. The variable hydraulic pump load regulator that is easy to process and install according to claim 3, characterized in that, A sealing gasket (1) is provided at the interface between the screw plug (4) and the external interface of the valve body (2). The sealing gasket (1) is a rubber flat gasket with a thickness of 1mm.

6. The variable hydraulic pump load regulator according to claim 1, which is easy to process and install, is characterized in that, The load feedback control port (LS) adopts an M12×1.25 thread, the high pressure port (P) adopts a 3.5mm hole, the low pressure port (T) adopts a 6.5mm hole, the working port (O) adopts a 5mm hole, and the screw limit port is a hole with a diameter of 12mm or 20mm. Furthermore, the high pressure port (P), low pressure port (T) and working port (O) in each external interface are all connected to the main oil passage in the valve body (2) to realize the flow of oil between the main oil passage and the external pipeline.

7. The variable hydraulic pump load regulator according to claim 2, which is easy to process and install, is characterized in that, It also includes a load-sensitive valve core (5), a pressure shut-off valve core, a large limit block (15), a small limit block (16), a large spring seat (7), a small spring seat (6), an internal flow spring (23), an external flow spring (22), an internal pressure spring (19), and an external pressure spring (18); the load-sensitive valve core (5) is assembled in the load-sensitive valve core cavity of the valve body (2), and the pressure shut-off valve core is assembled in the pressure shut-off valve core cavity of the valve body (2); the end of the first adjusting screw (12) is connected to... The large limit block (15) is in contact with the end of the second adjusting screw (13) and the small limit block (16); the large limit block (15) and the large spring seat (7) are provided with an inner pressure spring (19) and an outer pressure spring (18), and the small limit block (16) and the small spring seat (6) are provided with an inner flow spring (23) and an outer flow spring (22); the groove surface of the large spring seat (7) is in cooperation with the pressure shut-off valve core, and the groove surface of the small spring seat (6) is in cooperation with the load sensitive valve core (5).

8. The variable hydraulic pump load regulator according to claim 7, which is easy to process and install, is characterized in that, The groove surfaces of the large spring seat (7) and the small spring seat (6) are both arc-shaped structures, and the curvature of the arc-shaped structure is adapted to the end curvature of the load-sensitive valve core (5) and the pressure shut-off valve core, respectively.

9. The variable hydraulic pump load regulator according to claim 1, which is easy to process and install, is characterized in that, When adapted to a variable hydraulic pump with a displacement of 0.5-80mL / r, the length of the valve body (2) can be adjusted within the range of 100-200mm, and the width can be adjusted within the range of 40-100mm; and during the size adjustment process, the relative positions of the load-sensitive valve core cavity, the pressure-cut-off valve core cavity and the main oil passage inside the valve body (2) remain consistent with the machining reference.

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