Variable radial plunger pump

Abstract

The invention discloses a variable radial plunger pump, and relates to the technical field of plunger pumps, the variable radial plunger pump comprises a first shell and a second shell which are fixed through bolts, the interiors of the first shell and the second shell are sealed to define a sealing cavity, the variable radial plunger pump further comprises an eccentric mechanism, the eccentric mechanism comprises an eccentric wheel and a clamping shaft, and the eccentric wheel is located in the sealing cavity; a sliding clamping block is in sliding connection in the radial direction, a driving assembly is fixedly connected, and the output end of the driving assembly is in threaded connection with the sliding clamping block. The eccentric distance between the eccentric wheel and the clamping shaft can be adjusted, when the eccentric wheel eccentrically rotates, the stroke of the piston column is controlled in cooperation with the spring pipe, oil pumping work of hydraulic oil of different flows is conveniently conducted, and the power of the plunger pump is rapidly adjusted; the lifting column is controlled to stretch into and draw out of the fixing pipe so as to control the size of the oil pumping working area, namely the negative pressure space, in the fixing pipe, and adjustment in a larger range can be conducted in cooperation with work of the eccentric mechanism.

Description

Technical Field

[0001] The invention relates to the technical field of plunger pumps, and in particular to a variable radial plunger pump. Background Art

[0002] The plunger pump uses a plunger parallel to the transmission shaft to reciprocate in the plunger hole, causing the volume of the space where the hydraulic oil is located to change continuously, so as to pump the hydraulic oil. The radial variable plunger pump is a type of plunger pump. The existing radial variable plunger pump changes the displacement by changing the eccentricity of the rotor and the stator, and the plunger end shoe of the radial plunger pump slides on the inside of the stator, which easily causes the plunger and stator to wear during long-term operation, reducing the transmission efficiency and affecting the pumping efficiency.

[0003] In the prior art, a connecting rod structure is used to link the eccentric structure and the plunger. When the eccentric structure rotates eccentrically, the plunger is pushed to move by the connecting rod structure, and the eccentric position of the eccentric structure is controlled by an external hydraulic mechanism. In this method, there is a lack of further adjustment of the size of the pump oil working space, which reduces the adjustment range and requires additional installation of an external hydraulic mechanism, which increases the installation burden and reduces the rapid use effect of the plunger pump. When the eccentric structure is used to push the plunger, the friction with the plunger is large and there is a lack of lubrication effect on the plunger, which is prone to noise. Summary of the invention

[0004] The purpose of the present invention is to solve the problem in the prior art that there is a lack of further regulation of the size of the pump oil working space, thereby reducing the regulation range, and to propose a variable radial piston pump.

[0005] In order to achieve the above object, the present invention adopts the following technical solution: a variable radial piston pump, comprising a first shell and a second shell fixed by bolts, wherein the first shell and the second shell are sealed inside to form a sealed cavity, and further comprising: An eccentric mechanism, wherein the eccentric mechanism comprises an eccentric wheel and a clamping shaft, wherein the eccentric wheel is located in a sealed cavity, and is radially slidably connected to a sliding clamping block, and is fixedly connected to a driving assembly, wherein an output end of the driving assembly is threadedly connected to the sliding clamping block, and the clamping shaft is coaxially sealed and rotatably connected to the first housing, and one end extending into the sealed cavity is fixedly connected to the sliding clamping block, and the other end is coaxially fixedly connected to an output end of an external driving device; The oil pumping mechanism comprises an oil passing head, the oil passing head is filled with hydraulic oil, a plurality of the oil passing heads are fixedly connected to the outer peripheral side of the second shell, sealing movable frames are installed in both ends of the oil passing heads, a fixed tube is connected to the middle of the oil passing head, the fixed tube is sealed and extends into the sealed cavity at one end away from the oil passing head, a sealing ring is coaxially and slidably connected in the fixed tube, a piston column is coaxially and fixedly connected to the sealing ring, the piston column extends into the sealed cavity at one end away from the oil passing head, a spring tube is fixedly connected between the side and the fixed tube, and a roller is rotatably installed at the end, the roller is squeezed and rotated away from the piston column to press against the outer peripheral side of the eccentric wheel, the piston column is connected to a lifting assembly close to the oil passing head, and the output end part of the lifting assembly seals and extends out of the piston column.

[0006] In the above-mentioned variable radial piston pump, the eccentric wheel includes a first inner shell and a second inner shell, the first inner shell and the second inner shell are located inside the first outer shell and the second outer shell in a one-to-one correspondence, the first inner shell and the second inner shell are snap-fitted together to form an eccentric wheel, the eccentric wheel is eccentrically rotatably arranged in a sealing chamber, a first slide groove is provided on the first inner shell, and a second slide groove is provided on the second inner shell, the first slide groove and the second slide groove together form a sliding groove when the first inner shell and the second inner shell are snap-fitted together, the sliding snap-fit ​​block is slidably connected in the sliding groove, and a rotating shaft groove for movement of the snap-fit ​​shaft is provided on the first inner shell.

[0007] In the above-mentioned variable radial piston pump, the drive assembly includes a drive motor, and the two drive motors are installed between the first inner shell and the second inner shell. Both ends of the sliding clamping block are threaded with a screw rod, and the output ends of the two drive motors are coaxially fixedly connected with the two screw rods one by one.

[0008] In the above-mentioned variable radial piston pump, a first conductive column is installed on the sliding clamping block near the side of the second outer shell, a conductive column groove for the first conductive column to move is provided on the second inner shell, a cylindrical connector and an annular connector are installed in the second outer shell, the first conductive column and the cylindrical connector are rotated and electrically contacted, a clearance groove is provided on the side of the second inner shell near the second outer shell, a second conductive column is slidably connected in the clearance groove, the second conductive column and the annular connector are coaxially rotated and electrically contacted, the first conductive column and the second conductive column are electrically connected to two drive motors one by one, and the cylindrical connector and the annular connector are electrically connected to the output end of an external power supply device.

[0009] In the above variable radial piston pump, when the first inner shell and the second inner shell are snap-fitted together, the outer peripheral side is concave, and the roller rotates and abuts against the inside of the concave shape.

[0010] In the above variable radial piston pump, the sealing movable frame is a one-way valve structure, so that the hydraulic oil enters from one end of the oil passage head and is discharged from the other end.

[0011] In the above-mentioned variable radial piston pump, the plurality of oil passing heads are distributed in a circular array with the center of the second housing as the center.

[0012] In the above-mentioned variable radial piston pump, the lifting component includes an electric push rod, and the lifting component includes an electric push rod, which is installed in a piston column. The output end of the electric push rod is coaxially fixedly connected with a lifting column. A lifting groove is opened at one end of the piston column close to the oil passing head. The lifting groove is connected to the interior of a fixed tube at one end close to the oil passing head. The lifting column is sealingly and slidably connected in the lifting groove and extends into the fixed tube away from one end of the electric push rod.

[0013] In the above-mentioned variable radial piston pump, a plurality of oil leakage grooves are coaxially opened on the outer peripheral side of the lifting column, one end of the oil leakage groove is connected to the interior of the fixed tube, the side of the lifting groove is connected to an oil guide groove, and when the output end of the electric push rod is fully retracted, the other end of the oil leakage groove is connected to the oil guide groove, an oil accumulation chamber is opened inside the piston column, and the end of the oil guide groove away from the oil leakage groove is connected to the interior of the oil accumulation chamber, a sealing sponge is fixedly connected to one end of the piston column close to the roller, one end of the sealing sponge seals and passes through the piston column to extend into the oil accumulation chamber, and the other end slides and squeezes against the outer peripheral side of the roller.

[0014] In the above variable radial piston pump, a plurality of lubrication grooves are coaxially provided on the outer peripheral side of the roller.

[0015] Compared with the prior art, the advantages of the present invention are: The present invention provides an eccentric mechanism and an oil pumping mechanism. When the driving component in the eccentric mechanism is working, the eccentric distance between the eccentric wheel and the clamping shaft can be adjusted. Therefore, when the eccentric wheel rotates eccentrically, the stroke of the piston column is controlled by the spring tube, so that the oil pumping work of hydraulic oil with different flow rates can be conveniently performed and the power of the plunger pump can be quickly adjusted. When the lifting component in the oil pumping mechanism is working, the lifting column is controlled to extend into and out of the fixed tube to control the size of the oil pumping working area, i.e., the negative pressure space, in the fixed tube. In cooperation with the work of the eccentric mechanism, a wider range of adjustments can be performed, and the adjustment process is more stable and the flow rate change is more precise.

[0016] The present invention provides a lifting assembly. When the output end of the electric push rod in the lifting assembly is fully retracted, the oil leakage groove on the lifting column passes part of the hydraulic oil in the fixed pipe into the oil accumulation chamber through the oil guide groove, so that a small amount of hydraulic oil is brushed onto the roller through a sealing sponge partially immersed in the oil accumulation chamber, thereby further reducing the rolling friction of the roller and effectively reducing wear and noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of a variable radial piston pump proposed by the present invention; Figure 2 A schematic structural diagram of a variable radial piston pump proposed by the present invention from another perspective; Figure 3 A schematic structural diagram of a second housing portion of a variable radial piston pump proposed by the present invention; Figure 4 A vertical cross-sectional structural diagram of an oil-passing head of a variable radial piston pump proposed by the present invention; Figure 5 This is a schematic diagram of the internal structure of a fixed pipe portion of a variable radial piston pump proposed by the present invention in a cross-sectional state; Figure 6 This is a schematic diagram of the internal structure of a variable radial piston pump proposed by the present invention in a partially cut-away state of a piston rod; Figure 7 A schematic diagram of the internal structure of a second housing portion of a variable displacement radial piston pump proposed by the present invention in a cross-sectional state; Figure 8 for Figure 7 A schematic diagram of the enlarged structure of part A; Fig. 9 A schematic structural diagram of a combination of a first inner shell and a second inner shell of a variable radial piston pump proposed by the present invention; Fig.10 A schematic structural diagram of the combination of the first inner shell and the second inner shell of a variable radial piston pump proposed by the present invention from another perspective; Fig.11 This is a schematic diagram of the internal structure of a second inner shell portion of a variable radial piston pump proposed by the present invention in a cross-sectional state; Fig.12 This is a schematic structural diagram of a second inner casing portion of a variable radial piston pump proposed by the present invention; Fig.13 This is a schematic structural diagram of the first inner casing portion of a variable radial piston pump proposed by the present invention.

[0018] In the figure: 1. first outer shell; 2. second outer shell; 201. cylindrical connector; 202. annular connector; 3. oil-passing head; 4. sealing movable frame; 5. fixed tube; 6. spring tube; 7. piston column; 701. oil accumulation chamber; 702. oil guide groove; 8. sealing ring; 9. lifting column; 901. oil leakage groove; 902. electric push rod; 10. clamping shaft; 11. roller; 111. lubrication groove; 12. sealing sponge; 13. first inner shell; 131. shaft groove; 132. first slide groove; 14. second inner shell; 141. conductive column groove; 142. second slide groove; 15. sliding clamping block; 16. screw rod; 161. drive motor; 17. first conductive column; 18. second conductive column; 181. clearance groove. DETAILED DESCRIPTION

[0019] The following examples are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0020] Reference Figure 1-Figure 3 A variable radial piston pump comprises a first housing 1 and a second housing 2 fixed by bolts, wherein the first housing 1 and the second housing 2 are sealed inside to form a sealed cavity, and further comprises: Reference Figure 3 , Figure 7-Figure 12 , eccentric mechanism, the eccentric mechanism includes an eccentric wheel and a clamping shaft 10, the eccentric wheel is located in the sealing cavity, and is radially slidably connected with a sliding clamping block 15, and is fixedly connected with a driving assembly, the output end of the driving assembly is threadedly connected to the sliding clamping block 15, the clamping shaft 10 is coaxially sealed and rotatably connected to the first housing 1, and one end extending into the sealing cavity is fixedly connected to the sliding clamping block 15, and the other end is coaxially fixedly connected to the output end of the external driving device.

[0021] The eccentric wheel includes a first inner shell 13 and a second inner shell 14. The first inner shell 13 and the second inner shell 14 are located inside the first outer shell 1 and the second outer shell 2 in a one-to-one correspondence. The first inner shell 13 and the second inner shell 14 are snap-fitted together to form an eccentric wheel. The eccentric wheel can be eccentrically rotatably arranged in a sealed cavity. A first slide groove 132 is provided on the first inner shell 13, and a second slide groove 142 is provided on the second inner shell 14. The first slide groove 132 and the second slide groove 142 together form a sliding groove when the first inner shell 13 and the second inner shell 14 are snap-fitted together. The sliding clamping block 15 is slidably connected in the sliding groove. A rotating shaft groove 131 for the clamping shaft 10 to move is provided on the first inner shell 13.

[0022] The driving assembly includes a driving motor 161. The two driving motors 161 are installed between the first inner shell 13 and the second inner shell 14. Both ends of the sliding clamping block 15 are threaded with a screw rod 16. The output ends of the two driving motors 161 are coaxially fixedly connected with the two screw rods 16 in a one-to-one correspondence.

[0023] A first conductive column 17 is installed on the side of the sliding clamping block 15 close to the second outer shell 2, a conductive column slot 141 for the first conductive column 17 to move is provided on the second inner shell 14, a cylindrical connector 201 and an annular connector 202 are installed in the second outer shell 2, the first conductive column 17 and the cylindrical connector 201 are rotated and electrically contacted, a clearance groove 181 is provided on the side of the second inner shell 14 close to the second outer shell 2, a second conductive column 18 is slidably connected in the clearance groove 181, the second conductive column 18 and the annular connector 202 are coaxially rotated and electrically contacted, the first conductive column 17 and the second conductive column 18 are electrically connected to the two drive motors 161 one by one, and the cylindrical connector 201 and the annular connector 202 are electrically connected to the output end of the external power supply device.

[0024] During the rotation of the sliding clamping block 15 , the two driving motors 161 are energized through the first conductive column 17 and the second conductive column 18 and the cylindrical connector 201 and the annular connector 202 , so that the working state of the driving motor 161 can be controlled at any time.

[0025] When the first inner shell 13 and the second inner shell 14 are snap-fitted together, the outer circumference thereof is concave, and the roller 11 rotates and abuts against the inside of the concave.

[0026] Reference Figure 3-Figure 6 , the oil pumping mechanism comprises an oil passing head 3, the oil passing head 3 is filled with hydraulic oil, a plurality of oil passing heads 3 are fixedly connected to the outer peripheral side of the second shell 2, sealing movable frames 4 are installed at both ends of the oil passing head 3, a fixed pipe 5 is connected to the middle of the oil passing head 3, the fixed pipe 5 is sealed and penetrates into the sealed cavity at one end away from the oil passing head 3, a sealing ring 8 is coaxially and slidably connected in the fixed pipe 5, a piston column 7 is coaxially and fixedly connected to the sealing ring 8, the piston column 7 is extended into the sealed cavity at one end away from the oil passing head 3, and a spring tube 6 is fixedly connected between the side and the fixed pipe 5, and a roller 11 is rotatably installed at the end, the roller 11 is squeezed and rotated away from the piston column 7 and abuts against the outer peripheral side of the eccentric wheel, the piston column 7 is connected to a lifting assembly at one end close to the oil passing head 3, and the output end part of the lifting assembly seals and extends out of the piston column 7.

[0027] The sealing movable frame 4 is a one-way valve structure, so that the hydraulic oil enters from one end of the oil passage head 3 and is output from the other end.

[0028] The plurality of oil-passing heads 3 are distributed in a circular array with the center of the second housing 2 as the center.

[0029] The lifting assembly includes an electric push rod 902, which is installed in the piston column 7. The output end of the electric push rod 902 is coaxially fixedly connected with a lifting column 9. A lifting groove is provided at one end of the piston column 7 close to the oil passing head 3. The lifting groove is connected to the interior of the fixed tube 5 at one end close to the oil passing head 3. The lifting column 9 is sealingly and slidably connected in the lifting groove, and extends into the fixed tube 5 at one end away from the electric push rod 902.

[0030] A plurality of oil leakage grooves 901 are coaxially provided on the outer peripheral side of the lifting column 9, one end of the oil leakage groove 901 is connected to the interior of the fixed tube 5, and the side of the lifting groove is connected to an oil guide groove 702. When the output end of the electric push rod 902 is fully retracted, the other end of the oil leakage groove 901 is connected to the oil guide groove 702, and an oil accumulation chamber 701 is provided inside the piston column 7, and the end of the oil guide groove 702 away from the oil leakage groove 901 is connected to the interior of the oil accumulation chamber 701, and a sealing sponge 12 is fixedly connected to one end of the piston column 7 close to the roller 11, and one end of the sealing sponge 12 seals and passes through the piston column 7 to extend into the oil accumulation chamber 701, and the other end slides and presses against the outer peripheral side of the roller 11.

[0031] A plurality of lubrication grooves 111 are coaxially formed on the outer circumference of the roller 11 .

[0032] In the present invention, the external driving device works, and its output end drives the clamping shaft 10 to rotate, and the clamping shaft 10 drives the eccentric wheel to rotate eccentrically through the sliding clamping block 15. When the eccentric wheel rotates eccentrically, it forms an extrusion effect on multiple rollers 11 in turn, and under the cooperation of the elastic force of the spring tube 6, the piston column 7 is made to reciprocate linearly along the inside of the fixed tube 5. When the piston column 7 is pulled out of the fixed tube 5, a negative pressure space is formed in the fixed tube 5, and the sealing movable frame 4 in the oil inlet end of the oil passing head 3 is connected accordingly, and the external hydraulic oil is drawn into the negative pressure space through the oil inlet end of the oil passing head 3. When the piston column 7 is pressed into the fixed tube 5, an extrusion effect is formed on the hydraulic oil in the fixed tube 5, and the sealing movable frame 4 in the oil outlet end of the oil passing head 3 is connected accordingly, and the hydraulic oil in the fixed tube 5 is pumped into the outside through the oil outlet end of the oil passing head 3, completing the oil pumping operation; Since the first shell 1 and the second shell 2 of the plunger pump are fixed with bolts or other reinforcing components during use, the clamping shaft 10 can only rotate but not move, and the sliding clamping block 15 and the first conductive column 17 will not move but can only rotate. When it is necessary to control the pump oil power of the present invention, the two drive motors 161 are controlled to work, and their output ends drive the screw 16 to rotate. Considering the utilization rate of the plunger pump space, the drive motor 161 is arranged inside the first inner shell 13 and the second inner shell 14. The rotation of the screw 16 will inevitably make the drive motor 161 move closer to or farther away from the sliding clamping block 15. Only one end of the drive motor 161 can move, that is, the first inner shell 13 and the second inner shell 14 are not fixed and restricted. Therefore, the drive motor 161 inside the first inner shell 13 and the second inner shell 14 works, which will instead The first inner shell 13 and the second inner shell 14 are brought close to or away from the clamping shaft 10, thereby adjusting the distance between the sliding clamping block 15 and the axis of the deflection wheel, thereby adjusting the distance between the clamping shaft 10 and the axis of the deflection wheel, and quickly adjusting the eccentricity of the eccentric wheel. The roller 11 is always in contact with the outer surface of the eccentric wheel under the elastic force of the spring tube 6. When the eccentric wheel is driven to rotate by the clamping shaft 10, the distance between the clamping shaft 10 and the eccentric wheel is different, the stroke of the piston column 7 is also different, and the amount of hydraulic oil extracted is also different. Then, the power of the plunger pump can be quickly adjusted by controlling the drive motor 161; When the roller 11 rotates on the eccentric wheel, the rolling friction generated is smaller than the sliding friction, which can effectively reduce wear and noise; During long-term operation, the electric push rod 902 works under control, and its output end is completely retracted, and its output end drives the lifting column 9 to retract into the lifting groove, so that the oil leakage groove 901 of the lifting column 9 corresponds to and communicates with the oil guide groove 702 on the piston column 7, so that part of the hydraulic oil in the fixed pipe 5 can enter the oil accumulation chamber 701 on the piston column 7 through the oil leakage groove 901 and the oil guide groove 702, and the sealing sponge 12 on the piston column 7 is partially immersed in the hydraulic oil in the oil accumulation chamber 701, so that when the roller 11 rolls, the sealing sponge 12 brushes part of the hydraulic oil to the outer peripheral side of the roller 11 and the inside of the lubrication groove 111, further reducing rolling friction and noise; When the output end of the electric push rod 902 is not in a fully retracted state, the oil leakage groove 901 is not connected to the oil guide groove 702. At this time, the electric push rod 902 works, and its output end adjusts the lifting column 9 to move up and down. When the lifting column 9 is extended, the size of the negative pressure space can be reduced, and when the lifting column 9 is retracted, the size of the negative pressure space can be increased, thereby making a more subtle adjustment to the size of the negative pressure space; Similarly, when one of the piston columns 7 accumulates oil in the oil accumulation chamber 701 , the other several lifting columns 9 are adjusted to ensure the overall oil delivery stability.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A variable displacement radial piston pump, comprising a first housing (1) and a second housing (2) fixed by bolts, wherein the first housing (1) and the second housing (2) are sealed inside to form a sealed cavity, characterized in that: Also includes: An eccentric mechanism, the eccentric mechanism comprising an eccentric wheel and a clamping shaft (10), the eccentric wheel being located in a sealed cavity and being slidably connected to a sliding clamping block (15) in a radial direction and being fixedly connected to a driving assembly, the output end of the driving assembly being threadedly connected to the sliding clamping block (15), the clamping shaft (10) being coaxially sealed and rotatably connected to the first housing (1), and one end extending into the sealed cavity being fixedly connected to the sliding clamping block (15), and the other end being coaxially fixedly connected to the output end of an external driving device; The oil pump mechanism comprises an oil passing head (3), the oil passing head (3) is filled with hydraulic oil, a plurality of the oil passing heads (3) are fixedly connected to the outer peripheral side of the second housing (2), both ends of the oil passing head (3) are provided with sealing movable frames (4), the middle of the oil passing head (3) is connected with a fixed pipe (5), one end of the fixed pipe (5) away from the oil passing head (3) is sealed and penetrates into the inside of the sealing cavity, a sealing ring (8) is coaxially sealed and slidably connected to the inside of the fixed pipe (5), and the sealing ring (8) is coaxially sealed and slidably connected to the inside of the fixed pipe (5). A piston column (7) is coaxially fixedly connected to the ring (8), the end of the piston column (7) away from the oil-passing head (3) extends into the sealed cavity, a spring tube (6) is fixedly connected between the side and the fixed tube (5), and a roller (11) is rotatably mounted on the end, the roller (11) is pressed and rotated against the outer peripheral side of the eccentric wheel at the end away from the piston column (7), and a lifting component is connected to the end of the piston column (7) close to the oil-passing head (3), and the output end portion of the lifting component is sealed and extends out of the piston column (7).

2. A variable radial piston pump according to claim 1, characterized in that: The eccentric wheel comprises a first inner shell (13) and a second inner shell (14). The first inner shell (13) and the second inner shell (14) are located inside the first outer shell (1) and the second outer shell (2) in a one-to-one correspondence. The first inner shell (13) and the second inner shell (14) are snap-fitted together to form an eccentric wheel. The eccentric wheel is eccentrically rotatably arranged in a sealed cavity. The first inner shell (13) is provided with a first slide groove (132), and the second inner shell (14) is provided with a second slide groove (142). The first slide groove (132) and the second slide groove (142) together form a sliding groove when the first inner shell (13) and the second inner shell (14) are snap-fitted together. The sliding clamping block (15) is slidably connected in the sliding groove. The first inner shell (13) is provided with a rotating shaft groove (131) for the clamping shaft (10) to move.

3. A variable radial piston pump according to claim 2, characterized in that: The drive assembly comprises a drive motor (161), wherein two drive motors (161) are mounted between the first inner shell (13) and the second inner shell (14), and screw rods (16) are threadedly connected to both ends of the sliding clamping block (15), and the output ends of the two drive motors (161) are coaxially fixedly connected to the two screw rods (16) in a one-to-one correspondence.

4. A variable radial piston pump according to claim 3, characterized in that: A first conductive column (17) is installed on the side of the sliding clamping block (15) close to the second outer shell (2); a conductive column slot (141) for the first conductive column (17) to move is provided on the second inner shell (14); a columnar connector (201) and an annular connector (202) are installed in the second outer shell (2); the first conductive column (17) and the columnar connector (201) are rotated and electrically matched; a clearance slot (181) is provided on the side of the second inner shell (14) close to the second outer shell (2); a second conductive column (18) is slidably connected in the clearance slot (181); the second conductive column (18) and the annular connector (202) are coaxially rotated and electrically matched; the first conductive column (17) and the second conductive column (18) are electrically connected to two drive motors (161) in a one-to-one correspondence; the columnar connector (201) and the annular connector (202) are electrically connected to an output end of an external power supply device.

5. A variable radial piston pump according to claim 2, characterized in that: When the first inner shell (13) and the second inner shell (14) are snap-fitted together, the outer peripheral side is concave, and the roller (11) rotates and abuts against the inside of the concave.

6. A variable radial piston pump according to claim 1, characterized in that: The sealing movable frame (4) is a one-way valve structure, so that the hydraulic oil enters from one end of the oil passage head (3) and is discharged from the other end.

7. A variable radial piston pump according to claim 6, characterized in that: The plurality of oil-passing heads (3) are distributed in a circular array with the center of the second housing (2) as the center.

8. A variable displacement radial piston pump according to claim 1, characterized in that: The lifting assembly comprises an electric push rod (902), the electric push rod (902) being installed in a piston column (7), the output end of the electric push rod (902) being coaxially fixedly connected to a lifting column (9), the piston column (7) having an end close to the oil-passing head (3) being provided with a lifting groove, the end of the lifting groove close to the oil-passing head (3) being connected to the interior of a fixed tube (5), the lifting column (9) being sealingly slidably connected in the lifting groove, and the end away from the electric push rod (902) extending into the fixed tube (5).

9. A variable radial piston pump according to claim 8, characterized in that: A plurality of oil leakage grooves (901) are coaxially provided on the outer peripheral side of the lifting column (9), one end of the oil leakage groove (901) is communicated with the interior of the fixed tube (5), and the side of the lifting groove is communicated with an oil guide groove (702). When the output end of the electric push rod (902) is fully retracted, the other end of the oil leakage groove (901) is communicated with the oil guide groove (702). An oil accumulation chamber (701) is provided inside the piston column (7), and the end of the oil guide groove (702) away from the oil leakage groove (901) is communicated with the interior of the oil accumulation chamber (701). A sealing sponge (12) is fixedly connected to one end of the piston column (7) close to the roller (11), one end of the sealing sponge (12) seals and penetrates the piston column (7) to extend into the oil accumulation chamber (701), and the other end slides and presses against the outer peripheral side of the roller (11).

10. A variable radial piston pump according to claim 9, characterized in that: A plurality of lubrication grooves (111) are coaxially provided on the outer peripheral side of the roller (11).

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