Plunger pump power switching device

Abstract

The utility model discloses a plunger pump power switching device which comprises a shear control assembly and a control valve body, the shear control assembly comprises a protective plug, a nut, a clamp spring and an ejector rod, a control reset assembly is installed in the nut, the nut is hollow, and the two ends of the nut are provided with through openings. Through introduction of the control reset assembly, the power switching device can be flexibly adjusted in a wider range, accurate control over the power of the hydraulic pump is achieved, the adaptability and flexibility of the device are improved through the design, a more convenient and accurate power adjusting mode is provided for a user, and the practicability is high. And the comprehensive performance of the equipment is further improved.

Description

Technical Field

[0001] This utility model relates to the field of plunger pump design technology, and in particular to a plunger pump power switching device. Background Technology

[0002] Currently, most well-known domestic and international hydraulic component manufacturers adopt constant power control when designing swashplate piston pumps for hydraulic excavators. Constant power control means limiting the maximum power of the hydraulic pump. When the system pressure is high and the required flow rate is also large, the pump's output power will operate according to the designed total power curve, ensuring that the product of the system pressure and the piston pump's output flow rate (the pump's output power) is approximately constant. This function can ensure that the hydraulic pump avoids overload when working under supersaturated conditions, thus protecting the engine and the entire machine system.

[0003] The determination of the constant power design value of the hydraulic piston pump depends on the power value of the engine equipped in the system. Each engine manufacturer has a clear and unified specification on the maximum power limit. Therefore, when it comes to meeting the needs of different users of excavators for work efficiency and energy saving under different working conditions, relying on a fixed single constant power design value of the hydraulic pump can no longer meet the customer's requirements for efficiency and energy consumption. For example, excavators require high speed when traveling to reduce production operation auxiliary time, and low speed is needed to save energy when digging. This requires the hydraulic piston pump to achieve two different power design values ​​under two different working conditions. Therefore, in the improvement technology, most of them use a structure that is suitable for multiple working conditions and can realize the power switching of the hydraulic pump.

[0004] However, research has found that existing power switching structures often only have two fixed values ​​during switching, namely a fixed minimum value, which makes it difficult to adjust within a certain range.

[0005] Therefore, in response to the shortcomings of existing technologies, the applicant proposed a plunger pump power switching device as a solution. Utility Model Content

[0006] This invention provides a plunger pump power switching device, which solves the problems mentioned in the background.

[0007] To solve the above-mentioned technical problems, the present invention provides a plunger pump power switching device, comprising: a shear control component and a control valve body. The shear control component includes a protective plug, a nut, a snap ring, and a push rod. A control reset component is installed inside the nut. The nut is designed to be hollow inside and have through ports at both ends.

[0008] The control reset assembly comprises an adjusting rod in the inner cavity of the nut, the adjusting rod penetrates into the hollow part of the nut through a sliding channel, the top of the adjusting rod is connected with a sliding plate I, the top of the sliding plate I is connected with a sliding plate II, the sliding plate I and the sliding plate II slide in the inner cavity of the nut, the top of the sliding plate II is rotatably connected with a rotating rod, the bar-shaped rod penetrates out of the side opening of the inner cavity of the nut and slides, and the side of the bar-shaped rod is rotatably connected with a screw rod, and the screw rod penetrates out of the side wall of the nut and is connected through threads.

[0009] Preferably, the protective plug is sealingly installed at the outer end of the nut, the inner end of the nut is installed on the valve body of the control valve and is located at the position of the power control unit installed inside the valve body of the control valve, and the inner part of the nut is respectively installed with a snap spring and a jacking rod.

[0010] Preferably, the power control unit comprises a spring and a stopper, the spring is installed in the inner cavity of the valve body of the control valve, one end of the spring is installed with the stopper, the stopper penetrates into and abuts against each other from the opening at one end of the nut, and the stopper corresponds to the position of the jacking rod.

[0011] Preferably, the opening at one end of the nut is connected with the valve body of the control valve through a threaded connection, so as to fix the whole shear control assembly, and the opening at the other end of the nut is connected and installed with the protective plug through a G1 / 4 threaded connection.

[0012] Preferably, the snap spring is fixed in the clamping groove in the inner wall of the nut, so as to realize axial limiting of the jacking rod, and the jacking rod has a reverse T-shaped design in cross section.

[0013] Preferably, the lower end of the jacking rod abuts against the snap spring in normal state, the lead portion at the upper end of the jacking rod penetrates through the clearance hole in the inner part of the nut and moves, and the lead portion at the upper end of the jacking rod can contact the stopper when penetrating out of the clearance hole.

[0014] Preferably, the control reset assembly further comprises an L-shaped plate fixed on the side wall of the nut, the L-shaped plate is threadedly connected with the screw rod, and one threaded sleeve is threadedly connected with the screw rod at each side of the L-shaped plate.

[0015] Compared with the related art, the plunger pump power switching device has the following beneficial effects:

[0016] 1. The plunger pump power switching device can meet the comprehensive requirements of efficiency and energy consumption of various users under multiple working conditions, and effectively solves the problem that the constant power design value of the hydraulic plunger pump for excavators is single and cannot meet the comprehensive requirements of efficiency and energy consumption of users in the prior art.

[0017] 2. By controlling the introduction of the reset assembly, the power switching device can be flexibly adjusted in a wider range, realizing precise control of the power of the hydraulic pump. This design not only improves the adaptability and flexibility of the equipment, but also provides users with a more convenient and precise power adjustment method, further improving the overall performance of the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a schematic diagram of a hydraulic piston pump power control unit;

[0019] Figure 2 It is a schematic diagram of a structure with a hydraulic pump power switching control unit;

[0020] Figure 3 It is a sectional view of a switching control assembly for realizing the power switching of the hydraulic pump;

[0021] Figure 4 It is a sectional view of a switching control assembly for realizing the power switching of the hydraulic pump.

[0022] In the figure, 1 is a piston pump power switching device; 7 is a switching control assembly; 5 is a control valve body; 8 is a control reset assembly; 2 is a nut; 1 is a protective plug; 3 is a snap spring; 4 is a top rod; 10 is an adjusting rod; 9 is a sliding plate one; 12 is a sliding plate two; 14 is a strip rod; 13 is a rotating rod; 15 is a screw rod; 6 is a power control unit; 61 is a spring; 62 is a stop block; 17 is a threaded sleeve; 16 is an L-shaped plate. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0024] By Figure 1 It is a conventional hydraulic piston pump power control structure, including a control valve body 5 and a power control unit 6. The maximum power of the hydraulic pump and the power curve characteristics are set by a hydraulic test bench, and once set, the change is only affected by the system hydraulic pressure and the stiffness of the spring.

[0025] By Figures 2-4The power control unit 6 includes a spring 61 and a block 62, the spring 61 is installed in the inner cavity of the control valve body 5, and the spring 61 is installed at one end of the block 62, the block 62 extends into and abuts each other from the opening at one end of the nut 2, and corresponds to the position of the top rod 4;

[0026] The opening at one end of the nut 2 is connected with the butt joint of the control valve body 5 through a threaded installation mode, thereby fixing the entire shear control assembly 7, and the opening at the other end of the nut 2 is connected and installed with the protective plug 1 through a G1 / 4 threaded mode, or is connected with the whole machine line oil guide port, the snap spring 3 is fixed in the clamping groove on the inner wall of the nut 2, thereby achieving axial limiting of the top rod 4, avoiding axial (non-spring 61 side) movement of the top rod 4 in the nut 2, avoiding fluctuations and even failure of the entire structure function, the cross section of the top rod 4 is designed as an inverted "T" shape, the lower end of the top rod 4 abuts the snap spring 3 in a normal state, and the lead portion at the upper end passes through the gap hole in the interior of the nut 2 to move (note that the lead portion cannot be separated from the gap hole due to the limiting of the snap spring 3), and the lead portion at the upper end of the top rod 4 can contact the block 62 when it passes out of the gap hole.

[0027] Specific operations are as follows, when the plunger pump assembly is shipped, the protective plug 1 is added at the bottom of the nut 2 to prevent dust and oil seepage, when the plunger pump is assembled to the excavator, the protective plug 1 is removed, the whole machine line oil guide port is connected through the threaded connection of the nut 2, thereby providing driving hydraulic oil for the power shear control assembly 7, the length of the top rod 4 matched with the gap of the nut 2 serves as axial guidance, the excavator only needs to install a control switch for the power shear pilot oil path, thereby realizing power shear control, when the pilot switch is opened, the excavator provides pilot oil, the pilot oil acts on the top rod 4, the lower end of the top rod 4 is extruded, the lead portion moves in the gap hole and moves to the side of the spring 61, contacts and extrudes the block 62, until the top rod 4 is limited by the flat surface a at the gap hole of the nut 2 (see Figure 3Because the cross-section T-shaped design cannot continue to move upward, while overcoming the spring 61 force to move upward, the spring 61 is compressed upward, the power is cut off, and the energy saving effect in the working process of the excavator is achieved. When the pilot switch is closed, the pilot oil supply is cancelled, and under the action of the spring 61, the top rod 4 is reset, the contact spring 3 is contacted, the hydraulic pump constant power value returns to the initial given value of the design, and the axial limiting is performed through the contact spring 3. The top rod 4 thread part is prevented from falling off the nut 2, the function fluctuation of the entire power cut structure is caused, and even the failure is caused. The stability is increased. At this time, the constant power value of the hydraulic pump is the initial factory setting value, the power is maximum, the fast walking of the excavator can be realized, and the purpose of reducing the auxiliary operation time is achieved.

[0028] The nut 2 is internally provided with a control limiting assembly 8. The control limiting assembly 8 comprises an adjusting rod 10 located in the inner cavity of the nut 2. The adjusting rod 10 penetrates into the hollow part of the nut 2 through a slide way. The top of the adjusting rod 10 is connected with a slide plate one 9. The slide plate one 9 is provided with a slide plate two 12 at the top. The slide plate one 9 and the slide plate two 12 slide in the inner cavity of the nut 2. The top of the slide plate two 12 is rotatably provided with a rotating rod 13 (i.e. the rotating rod 13 is rotatably connected with the slide plate two 12 and the slide plate two 12). The strip-shaped rod 14 penetrates out of the inner cavity of the nut 2 from one side and slides. The strip-shaped rod 14 is rotatably provided with a screw rod 15 at one side. The screw rod 15 penetrates out of the side wall of the nut 2 and is screw-connected. The lower end of the top rod 4 can be in contact with the adjusting rod 10 when the lower end of the top rod 4 is lifted, and then the limiting is performed.

[0029] The control limiting assembly 8 further comprises an L-shaped plate 16 fixed to the side wall of the nut 2. The L-shaped plate 16 is screw-connected with the screw rod 15. The screw rod 15 is screw-connected with a threaded sleeve 17 at both sides of the L-shaped plate 16.

[0030] Through the above structural design, on the basis of the original shear control assembly, the control limiting assembly 8 can also be introduced, in actual operation, when the pilot switch is opened and the pilot oil acts on the jack rod 4, the jack rod 4 will start to rise and contact the adjusting rod 10, the adjusting rod 10 is extruded and moves up, the sliding plate one 9 touches the sliding plate two 12, causing the rising stroke of the jack rod 4 to be limited and unable to continue to move upwards until being limited by the plane a at the gap hole of the nut 2, in this way, by adjusting the parameters of the control limiting assembly 8, the precise control of the rising stroke of the jack rod 4 can be realized, and then the precise adjustment of the power of the hydraulic pump is realized, and when the parameters of the limiting are adjusted, the screw rod 15 can be rotated to make the strip-shaped rod 14 horizontally displace (note that the strip-shaped rod 14 cannot be rotated when sliding in the direction opening), by rotating the rod 13 to pull up the sliding plate two 12, it is very convenient and has better applicability (note that when the sliding plate two 12 is pulled up to the maximum position, the jack rod 4 can be pulled up to the maximum amplitude and is limited by the plane a at the gap hole of the nut 2), and since the screw thread cooperation between the screw rod 15 and the threaded sleeve 17 has self-locking property, once the parameters of the control limiting assembly 8 are adjusted, the parameters can be ensured not to change in the working process, so that the stability and reliability of the power adjustment are ensured, finally, the adjusting rod 10 is pulled up to stretch the metal tension spring 11, and when the pilot oil supply is cancelled, the adjusting rod 10 and the sliding plate one 9 can be reset.

[0031] It should be noted that in this document, the terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment.

[0032] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A power switching device for a plunger pump, characterized by Include: Shear control assembly (7) and control valve valve body (5), the shear control assembly (7) includes protective plug (1), nut (2), snap spring (3) and top rod (4), the inside of the nut (2) installs control reset assembly (8), the nut (2) adopts the design of hollow and both ends are open mouth; The control reset assembly (8) includes an adjusting rod (10) located in the inner cavity of the nut (2), the adjusting rod (10) passes through the slide way and enters the hollow part of the nut (2), the top of the adjusting rod (10) is connected with the slide plate one (9), the top of the slide plate one (9) has a slide plate two (12), the slide plate one (9) and the slide plate two (12) slide in the inner cavity of the nut (2), and the top of the slide plate two (12) is rotatably connected with the rotating rod (13) at the bottom of the strip-shaped rod (14), the strip-shaped rod (14) passes out from the inner cavity of the nut (2) and slides, and the strip-shaped rod (14) is rotatably connected with the screw rod (15) at one side, the screw rod (15) passes out from the side wall of the nut (2) and is connected by screw thread.

2. The power switching device for a plunger pump according to claim 1, wherein The protective plug (1) is sealingly installed at the outer end of the nut (2), the inner end of the nut (2) is installed on the control valve valve body (5) and located at the position of the power control unit (6) installed inside the control valve valve body (5), the inner part of the nut (2) is respectively provided with the snap spring (3) and the top rod (4).

3. The power switching device for a plunger pump according to claim 2, wherein The power control unit (6) includes a spring (61) and a stop block (62), the spring (61) is installed in the inner cavity of the control valve valve body (5), one end of the spring (61) is connected with the stop block (62), the stop block (62) extends into and abuts each other from the opening at one end of the nut (2), and corresponds to the position of the top rod (4).

4. The power switching device for a plunger pump according to claim 3, wherein The opening at one end of the nut (2) is connected with the control valve valve body (5) by thread connection, thereby fixing the whole shear control assembly (7), the other opening of the nut (2) is connected with the protective plug (1) by G1 / 4 thread connection.

5. The power switching device for a plunger pump of claim 1, wherein, The snap spring (3) is fixed in the clamping groove of the inner wall of the nut (2), so as to limit the axial position of the top rod (4), the cross section of the top rod (4) is designed as an inverted "T" shape.

6. The plunger pump power switching device of claim 5, wherein, The lower end of the top rod (4) abuts the snap spring (3) in normal state, the lead part at the upper end of the top rod (4) passes through the clearance hole in the inner part of the nut (2) and moves, and the lead part at the upper end of the top rod (4) can contact the stop block (62) when passing out of the clearance hole, and the lower end of the top rod (4) can contact the adjusting rod (10) when rising.

7. The power switching device for a plunger pump according to claim 6, wherein The control reset assembly (8) further includes an L-shaped plate (16) fixed on the side wall of the nut (2), the L-shaped plate (16) is connected with the screw rod (15) by screw thread, and the screw rod (15) is connected with a threaded sleeve (17) at each side of the L-shaped plate (16) by screw thread.

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