Hydraulic power drive assembly

Abstract

The invention discloses a hydraulic power drive assembly which comprises a cylinder body and a hydraulic power drive assembly. The hollow shaft is arranged in the cylinder body; the oil distribution disc is sleeved on the hollow shaft; the first oil distribution groove and the second oil distribution groove are formed in the side wall of the oil distribution disc; the first flow distribution hole group and the second flow distribution hole group are respectively arranged in the first oil distribution groove and the second oil distribution groove; the first oil supply cavity is communicated with the first oil distribution groove; the second oil supply cavity is communicated with the second oil distribution groove; the main oil pipeline is arranged in a mounting blind hole in the inner wall of the cylinder body; the mechanical valve group is arranged in the mounting blind hole; the spring assembly is arranged at the bottom of the mounting blind hole; the cylinder stator is arranged at the lower end of the cylinder body and connected with the cylinder body; the plunger rotor is arranged in the cylindrical stator; the power head assembly is arranged at the lower end of the cylindrical stator and connected with the hollow shaft; and the mechanical arm assembly is connected with the power head assembly. According to the technical scheme, under the condition that the flow of an oil way is not changed, stable switching of high-speed and low-speed output gears can be carried out, and hydraulic impact is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydraulic motors, and more particularly to a hydraulic power drive assembly. BACKGROUND

[0002] The hydraulic motor is commonly known as an oil motor, which, like the oil cylinder, is an execution element in the hydraulic system. The difference is that the oil cylinder performs linear reciprocating motion, while the hydraulic motor realizes continuous rotary motion. It can convert the liquid pressure provided by the hydraulic pump into the rotational speed of its output shaft. Among them, the double-speed hydraulic motor is a special execution element that can achieve two different output speeds and torques on the same motor.

[0003] At present, the double-speed hydraulic motor usually includes two working modes of low-speed large torque and high-speed small torque, and the high-low speed gear position switching is a specific operation process. The traditional double-speed hydraulic motor generally changes the position of the electromagnetic reversing valve to change the connection mode of the internal oil circuit or change the displacement to switch the gear. However, the control of the electromagnetic reversing valve is instantaneous and rapid, that is, when the oil circuit is switched by using the reversing valve, the working cavity in the hydraulic motor will change suddenly. For example, when switching from high-speed gear to low-speed gear, the motor needs to suck in more oil instantaneously, which will cause the pressure of the oil inlet to drop suddenly; and when switching from low-speed gear to high-speed gear, the oil circuit channel changes suddenly, and part of the high-pressure oil needs to be quickly depressurized or change direction, which will generate a sharp pressure peak in the system. Obviously, the switching of the control valve is "hard switching", that is, on-off, without a smooth transition process, and the gear position switching is not smooth, which is easy to cause hydraulic impact. For smooth switching, the prior art also uses an electrically controlled variable motor or directly adjusts the flow and pressure through an electro-hydraulic proportional pump to realize more intelligent and smoother speed control, which can fundamentally avoid the many shortcomings brought by the external switching valve. However, the internal structure of such a motor becomes more complex, which means higher production cost in manufacturing.

[0004] Therefore, how to provide a hydraulic power drive assembly which can smoothly switch the high-low speed output gear without changing the oil circuit flow, and reduce hydraulic impact, has become a technical problem to be solved by those skilled in the art. SUMMARY

[0005] To solve the above technical problems, the present application provides a hydraulic power drive assembly which can smoothly switch the high-low speed output gear without changing the oil circuit flow, and reduce hydraulic impact.

[0006] The technical scheme provided by the present application is as follows: This invention provides a hydraulic power drive assembly, comprising: a cylinder body; a hollow shaft disposed within the cylinder body; a distribution plate sleeved on the hollow shaft; a first distribution groove and a second distribution groove disposed on the side wall of the distribution plate; a first distribution hole group and a second distribution hole group respectively disposed in the first distribution groove and the second distribution groove; a first oil supply chamber disposed on the inner wall of the cylinder body and communicating with the first distribution groove; a second oil supply chamber disposed on the inner wall of the cylinder body and communicating with the second distribution groove; a main oil pipeline disposed on the side wall of the cylinder body and communicating with the first oil supply chamber and the second oil supply chamber; and a main oil pipeline disposed on the side wall of the cylinder body and communicating with the first oil supply chamber and the second oil supply chamber. The cylinder body has a blind mounting hole on its inner wall; a mechanical valve assembly disposed within the blind mounting hole; the mechanical valve assembly is used to open and close the oil supply circuit between the first oil supply chamber and the second oil supply chamber; a spring assembly disposed at the bottom of the blind mounting hole and abutting against the mechanical valve assembly; a cylindrical stator disposed at the lower end of the cylinder body and connected to the cylinder body; a plunger rotor disposed inside the cylindrical stator, one end of which is connected to the hollow shaft, and the other end of which movably abuts against the inner wall of the cylindrical stator; a power head assembly disposed at the lower end of the cylindrical stator and connected to the hollow shaft; and a robotic arm assembly connected to the power head assembly.

[0007] Furthermore, in a preferred embodiment of the invention, the mechanical valve assembly includes; A fixed valve sleeve is installed within the mounting blind hole; A shoulder is provided on the side wall of the fixed valve sleeve to separate the first oil supply chamber and the second oil supply chamber; A first valve sleeve oil groove and a second valve sleeve oil groove are arranged parallel to each other on the inner sidewall of the fixed valve sleeve; The first valve sleeve oil groove and the second valve sleeve oil groove are respectively connected to the first oil supply chamber and the second oil supply chamber; A mechanical valve core is disposed in the inner hole of the fixed valve sleeve and slidably connected to the fixed valve sleeve; The lower end of the mechanical valve core abuts against the spring assembly; A pilot oil supply line is provided on the side wall of the cylinder block and communicates with the inner hole of the fixed valve sleeve; The first valve core oil groove and the second valve core oil groove are arranged in parallel within the mechanical valve core; The first valve core oil groove and the second valve core oil groove are interconnected; The first valve sleeve oil groove, the first valve core oil groove, the second valve core oil groove, and the second valve sleeve oil groove are combined to form the oil supply circuit between the first oil supply chamber and the second oil supply chamber.

[0008] Furthermore, in a preferred embodiment of the present invention, the spring assembly is provided with a first working state and a second working state; When the spring assembly is in the first working state, the oil supply circuit between the first oil supply chamber and the second oil supply chamber is closed. When the spring assembly is in the second working state, at least one set of the first valve core oil groove is connected to the first valve sleeve oil groove, and the second valve core oil groove is connected to the second valve sleeve oil groove, that is, the oil supply circuit between the first oil supply chamber and the second oil supply chamber is opened.

[0009] Furthermore, in a preferred embodiment of the present invention, the cylindrical stator comprises: cylindrical body; An inner curved guide rail is provided on the inner side wall of the cylindrical body; The inner curved guide rail includes multiple repeating wave protrusions and grooves.

[0010] Furthermore, in a preferred embodiment of the invention, the plunger rotor comprises: Rotor body; A plunger hole is provided on the rotor body; A plunger body that is slidably disposed within the plunger bore; A pin is located at the front end of the plunger body; The bearing assembly is mounted on the pin. Cylindrical rollers disposed on the bearing assembly and abutting against the inner curved guide rail; One end is connected to the plunger hole, and the other end is connected to the distribution pipeline of the first distribution hole group or the second distribution hole group; A distribution piston installed on the distribution pipeline; The distribution piston has an internal reducing hole, and the diameter of the reducing hole at the oil inlet end of the distribution piston is larger than the diameter of the reducing hole at the oil outlet end of the distribution piston. A buffer spring is disposed at the bottom of the distribution piston and abuts against the distribution piston.

[0011] Furthermore, in a preferred embodiment of the present invention, a transmission gear is fitted onto the lower end of the hollow shaft.

[0012] Furthermore, in a preferred embodiment of the invention, the power head assembly includes: A rolling bearing fitted onto the hollow shaft; A first sealing cap sleeved on the rolling bearing and connected to the bottom end of the cylindrical stator; The power head housing is located at the lower end of the first sealing end cover; The double internal gear ring is disposed in the power head housing and is sleeved on the hollow shaft. The small teeth of the double internal gear ring mesh with the transmission gear. A double tapered roller bearing, fitted onto the outer wall of the double internal gear ring and abutting against the inner wall of the power head housing; Splined shaft end cap disposed within the double internal gear ring; The splined shaft end cap is fitted onto the bottom end of the hollow shaft and is connected to the bottom surface of the large tooth of the double internal gear ring. A ball joint drill sleeve is embedded in the double internal gear ring and engages with the splined shaft end cap. The ball joint drill sleeve is provided with an external gear, which meshes with the large tooth of the double internal gear ring; The tooth width of the large tooth of the double internal gear ring is greater than the tooth width of the external gear, and the ball jack drill sleeve can float freely within the double internal gear ring; A sealing assembly disposed at the lower end of the power head housing and connected to the power head housing.

[0013] Furthermore, in a preferred embodiment of the invention, the sealing assembly comprises: The second sealing cover is located at the bottom of the power head housing; A third sealing cover is disposed at the lower end of the second sealing cover and engages with the second sealing cover; A sleeve is disposed between the second sealing cover and the third sealing cover; A water seal fitted onto the third sealing cap; A sealing sleeve disposed inside the third sealing cover; The sealing sleeve is fitted onto the outer wall of the double internal gear ring, and its top end abuts against the double tapered roller bearing; A floating oil seal cap fitted onto the sealing sleeve, the outer wall of which abuts against the third sealing cap; A floating oil seal is disposed between the second sealing cover and the floating oil seal cover; A sealing spring is installed inside the third sealing cover; A locking half-ring is located at the lower end of the third sealing cover, the floating oil seal cover, and the sealing sleeve, and abuts against the sealing spring.

[0014] Furthermore, in a preferred embodiment of the invention, the robotic arm assembly includes: A floating ball seat is located at the bottom of the power head assembly; A first guide groove is provided on the bottom surface of the floating ball seat; The unloader slider is disposed in the first guide groove; A second guide groove is disposed on the side wall of the floating ball seat and communicates with the first guide groove; A lever block is disposed in the second guide groove and is movably connected to the slider of the unloader. One end is connected to the power head assembly, and the other end is connected to the mechanical arm body of the lever; Hydraulic cylinders are installed on the main body of the robotic arm to drive the main body of the robotic arm to float up and down.

[0015] Furthermore, in a preferred embodiment of the present invention, the hydraulic power drive assembly further includes: A fourth sealing cover is disposed at the upper end of the cylinder body and connected to the cylinder body; A water-sealed elbow is installed on the fourth sealing cover and communicates with the hollow hole of the hollow shaft.

[0016] This invention provides a hydraulic power drive assembly, comprising: a cylinder body; a hollow shaft disposed within the cylinder body; a distribution plate sleeved on the hollow shaft; a first distribution groove and a second distribution groove disposed on the side wall of the distribution plate; a first distribution hole group and a second distribution hole group respectively disposed in the first distribution groove and the second distribution groove; a first oil supply chamber disposed on the inner wall of the cylinder body and communicating with the first distribution groove; a second oil supply chamber disposed on the inner wall of the cylinder body and communicating with the second distribution groove; a main oil pipeline disposed on the side wall of the cylinder body and communicating with the first oil supply chamber and the second oil supply chamber; and a hydraulic power drive assembly. A blind mounting hole on the inner wall of the cylinder body; a mechanical valve assembly disposed within the blind mounting hole; the mechanical valve assembly being used to open and close the oil supply circuit between the first oil supply chamber and the second oil supply chamber; a spring assembly disposed at the bottom of the blind mounting hole and abutting against the mechanical valve assembly; a cylindrical stator disposed at the lower end of the cylinder body and connected to the cylinder body; a plunger rotor disposed within the cylindrical stator, one end connected to the hollow shaft, and the other end movably abutting against the inner wall of the cylindrical stator; a power head assembly disposed at the lower end of the cylindrical stator and connected to the hollow shaft; and a robotic arm assembly connected to the power head assembly. The hydraulic power drive assembly is mainly composed of a cylinder block, a hollow shaft, a distributor plate, a first distributor groove, a second distributor groove, a first distribution hole group, a second distribution hole group, a first oil supply chamber, a second oil supply chamber, a main oil pipeline, a mounting blind hole, a mechanical valve group, a spring assembly, a cylindrical stator, a plunger rotor, a power head assembly, and a robotic arm assembly. The cylinder block, hollow shaft, distributor plate, first distributor groove, second distributor groove, first distribution hole group, second distribution hole group, first oil supply chamber, second oil supply chamber, main oil pipeline, mounting blind hole, mechanical valve group, spring assembly, cylindrical stator, and plunger rotor combine to form a hydraulic motor, which provides rotational power to the power head assembly. In the hydraulic motor's structure, the hollow shaft is vertically positioned at the cylinder block's central axis, and the distributor plate is fitted onto the hollow shaft. The distributor plate has the first distributor groove and the second distributor groove sequentially formed from top to bottom. The first and second distribution hole groups are respectively installed in the first and second oil distribution grooves. The first and second distribution hole groups correspond to the distribution pipelines of different plunger rotors, and oil is supplied and returned to different plunger rotors through the first and second distribution hole groups. Secondly, in conjunction with the first and second oil distribution grooves, the first oil supply chamber and the second oil supply chamber are sequentially opened from top to bottom on the inner wall of the cylinder. The first and second oil supply chambers are separated by the oil distribution plate. External oil is supplied from the main oil pipeline into the first oil supply chamber. The installation blind hole is provided on the inner wall of the cylinder. A spring assembly and a mechanical valve assembly are sequentially arranged from bottom to top in the installation blind hole. The valve core of the mechanical valve assembly can reciprocate linearly in the installation blind hole under the action of the pressure of the pressure oil and the elastic force of the spring assembly, thereby opening and closing the oil supply circuit between the first and second oil supply chambers.In simple terms, when the mechanical valve assembly is not supplied with pressurized oil, the spring assembly pushes the mechanical valve assembly up, and the spring assembly is in the first working state. The valve core structure of the mechanical valve assembly closes the oil supply circuit between the first and second oil supply chambers, allowing only high-pressure oil to flow through half of the high-pressure holes on the distribution plate. That is, the hydraulic oil in the first oil supply chamber only enters the corresponding plunger rotor through the first distribution hole group. Because only a portion of the plungers work at a time, more hydraulic oil is needed to drive the rotor to rotate one revolution. Therefore, with a constant input flow, the rotation speed is slow, i.e., the hydraulic motor is in a low-speed working position. However, at the same time, each working plunger bears the entire system pressure, so the output torque is large. When the mechanical valve assembly is supplied with pressurized oil of the corresponding pressure, the thrust generated by the pressurized oil overcomes the spring force and pushes the valve core to a new position. The spring assembly is in the second working state. After the valve core moves, the first oil supply... The oil supply circuit between the oil chamber and the second oil supply chamber is connected, opening a new oil passage that allows access to all high-pressure holes on the distribution plate, namely the first and second distribution hole groups. This increases the number of working plunger shafts and the amount of hydraulic oil required for one rotor rotation. With the input flow rate remaining constant, the motor speed doubles, placing the hydraulic motor in a high-speed operating position. However, simultaneously, the system pressure is distributed to more plungers, reducing the thrust generated by each plunger and thus lowering the total output torque. Furthermore, due to the continuous supply of pressurized oil, the process of the pressurized oil overcoming the spring force to perform work—that is, the compression of the spring assembly—is continuous and slow. This means the oil supply circuit opens and closes smoothly, allowing for smooth and gentle switching between high and low speeds with minimal hydraulic shock. Therefore, the technical solution of this invention, compared to existing technologies, enables smooth switching between high and low speed output gears without changing the oil flow rate, reducing hydraulic shock. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a full sectional view of the hydraulic power drive assembly provided in an embodiment of the present invention; Figure 2 This is a front view of the hydraulic power drive assembly provided in an embodiment of the present invention; Figure 3 A side view of the hydraulic power drive assembly provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the internal structure of the hydraulic motor provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the internal structure of the mechanical valve assembly provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of the plunger rotor provided in an embodiment of the present invention; Figure 7 This is a schematic diagram of the internal structure of the power head assembly provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of the internal structure of the sealing assembly provided in an embodiment of the present invention; Figure 9 This is an enlarged schematic diagram of the local structure of region A provided in an embodiment of the present invention.

[0019] Explanation of reference numerals in the attached figures: 1. Cylinder block; 2. Hollow shaft; 3. Oil distribution plate; 4. First distribution hole group; 5. Second distribution hole group; 6. First oil supply chamber; 7. Second oil supply chamber; 8. Mechanical valve group; 801. Fixed valve sleeve; 802. Shoulder; 803. First valve sleeve oil groove; 804. Second valve sleeve oil groove; 805. Mechanical valve core; 806. Pilot oil supply line; 807. First valve core oil groove; 808. Second valve core oil groove; 9. Mounting blind hole; 10. Spring assembly; 11. Cylindrical stator; 12. Plunger rotor; 1201. Rotor body; 1202. Plunger hole; 1203. Plunger body; 1204. Bearing assembly; 1205. Cylindrical roller; 1206. Distribution line; 1207. Distribution piston; 1208. Reducing through hole; 1209. Buffer spring; Power head assembly. 13; Rolling bearing 1301; First sealing cover 1302; Power head housing 1303; Double internal gear ring 1304; Double tapered roller bearing 1305; Splined shaft end cover 1306; Ball joint drill sleeve 1307; Sealing assembly 1308; Robotic arm assembly 14; Floating ball seat 1401; First guide groove 1402; Unloader slider 1403; Second guide groove 1404; Pulley 1405; Robotic arm body 1406; Fourth sealing cover 15; Water seal elbow 16; Transmission gear 17; Second sealing cover 18; Third sealing cover 19; Sleeve 20; Water seal 21; Sealing sleeve 22; Floating oil seal cover 23; Floating oil seal 24; Sealing spring 25; Locking half ring 26. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0021] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly set on the other component; when a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to the other component.

[0022] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "first", "second", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" or "several" means two or more, unless otherwise explicitly specified.

[0024] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0025] like Figures 1 to 9As shown in the figure, the hydraulic power drive assembly provided in this embodiment of the invention is composed of a cylinder body 1, a hollow shaft 2, a distribution plate 3, a first distribution groove, a second distribution groove, a first distribution hole group 4, a second distribution hole group 5, a first oil supply chamber 6, a second oil supply chamber 7, a main oil pipeline, a mounting blind hole 9, a mechanical valve group 8, a spring assembly 10, a cylindrical stator 11, a plunger rotor 12, a power head assembly 13, and a mechanical arm assembly 14.

[0026] This invention provides a hydraulic power drive assembly, specifically comprising: a cylinder body 1; a hollow shaft 2 disposed within the cylinder body 1; an oil distribution plate 3 sleeved on the hollow shaft 2; a first oil distribution groove and a second oil distribution groove disposed on the side wall of the oil distribution plate 3; a first distribution hole group 4 and a second distribution hole group 5 respectively disposed in the first oil distribution groove and the second oil distribution groove; a first oil supply chamber 6 disposed on the inner wall of the cylinder body 1 and communicating with the first oil distribution groove; a second oil supply chamber 7 disposed on the inner wall of the cylinder body 1 and communicating with the second oil distribution groove; a main oil pipeline disposed on the side wall of the cylinder body 1 and communicating with the first oil supply chamber 6 and the second oil supply chamber 7; and a main oil pipeline disposed on the inner wall of the cylinder body 1. The invention comprises: a blind mounting hole 9; a mechanical valve assembly 8 disposed within the blind mounting hole 9; the mechanical valve assembly 8 being used to open and close the oil supply circuit between the first oil supply chamber 6 and the second oil supply chamber 7; a spring assembly 10 disposed at the bottom of the blind mounting hole 9 and abutting against the mechanical valve assembly 8; a cylindrical stator 11 disposed at the lower end of the cylinder body 1 and connected to the cylinder body 1; a plunger rotor 12 disposed within the cylindrical stator 11, one end connected to the hollow shaft 2, and the other end movably abutting against the inner wall of the cylindrical stator 11; a power head assembly 13 disposed at the lower end of the cylindrical stator 11 and connected to the hollow shaft 2; and a robotic arm assembly 14 connected to the power head assembly 13. The technical solution of this invention enables smooth switching between high and low speed output gears without changing the oil flow rate, reducing hydraulic shock.

[0027] The technical solution of the present invention will be described in detail below with reference to specific embodiments: In this embodiment, there are 8 plunger rotors 12. The first distribution hole group 4 connects 4 of the plunger rotors 12, and the second distribution hole group 5 connects the other 4 plunger rotors 12.

[0028] Specifically, in a specific embodiment of the present invention, the mechanical valve assembly 8 includes: a fixed valve sleeve 801 disposed within the mounting blind hole 9; a shoulder 802 disposed on the side wall of the fixed valve sleeve 801 for separating the first oil supply chamber 6 and the second oil supply chamber 7; a first valve sleeve oil groove 803 and a second valve sleeve oil groove 804 disposed parallel to each other on the inner side wall of the fixed valve sleeve 801; the first valve sleeve oil groove 803 and the second valve sleeve oil groove 804 respectively communicating with the first oil supply chamber 6 and the second oil supply chamber 7; and a mechanical valve disposed in the inner hole of the fixed valve sleeve 801 and slidably connected to the fixed valve sleeve 801. The mechanical valve core 805 has its lower end abutting against the spring assembly 10; a pilot oil supply line 806 is disposed on the side wall of the cylinder body 1 and communicates with the inner hole of the fixed valve sleeve 801; a first valve core oil groove 807 and a second valve core oil groove 808 are arranged parallel to each other in the mechanical valve core 805; the first valve core oil groove 807 and the second valve core oil groove 808 are interconnected; the first valve sleeve oil groove 803, the first valve core oil groove 807, the second valve core oil groove 808 and the second valve sleeve oil groove 804 are combined to form the oil supply circuit between the first oil supply chamber 6 and the second oil supply chamber 7.

[0029] In this embodiment of the invention, the mechanical valve assembly 8 is used to open or close the oil supply and return between the first oil supply chamber 6 and the second oil supply chamber 7; for example... Figure 4 , 5 As shown, the main structure of the mechanical valve assembly 8 consists of a fixed valve sleeve 801, a shoulder 802, a first valve sleeve oil groove 803, a second valve sleeve oil groove 804, a mechanical valve core 805, a pilot oil supply line 806, a first valve core oil groove 807, and a second valve core oil groove 808; wherein, the fixed valve sleeve 801 is fixedly installed in the mounting blind hole 9, the mechanical valve core 805 is slidably disposed in the inner hole of the fixed valve sleeve 801, and the upper end of the mechanical valve core 805 is connected to the pilot oil supply line 806, for use... The lower end of the valve core 805 abuts against the spring assembly 10 and is supplied with pressure oil. The first valve sleeve oil groove 803 and the first valve core oil groove 807 are arranged in parallel on the fixed valve sleeve 801. The mechanical valve core 805 is provided with the first valve core oil groove 807 and the second valve core oil groove 808. The mechanical valve core 805 can perform linear reciprocating motion in the inner hole of the fixed valve sleeve 801 under the action of pressure oil and spring assembly 10. When a specific valve sleeve oil groove aligns with the valve core oil groove, the oil supply circuit is opened; otherwise, the oil supply circuit is closed.

[0030] Specifically, in a specific embodiment of the present invention, the spring assembly 10 is provided with a first working state and a second working state; when the spring assembly 10 is in the first working state, the oil supply circuit between the first oil supply chamber 6 and the second oil supply chamber 7 is closed; when the spring assembly 10 is in the second working state, at least one set of the first valve core oil groove 807 is connected to the first valve sleeve oil groove 803, and the second valve core oil groove 808 is connected to the second valve sleeve oil groove 804, that is, the oil supply circuit between the first oil supply chamber 6 and the second oil supply chamber 7 is open.

[0031] In this embodiment of the invention, the first working state of the spring assembly 10 is the extended state of the spring assembly 10. In this state, no pressure oil is input into the pilot oil supply line 806. At this time, the oil supply circuit is closed, and the high-pressure oil in the first oil supply chamber 6 only enters the first distribution hole group 4 to provide high-pressure oil for the four plunger rotors 12. During the rotation of the rotor, only half of the plungers will generate driving torque. Although the other half of the plungers also pass through the track, when they need power, the oil hole of the corresponding distribution plate 3 is blocked by the valve core and cannot generate effective thrust. Under the condition of constant input flow, the speed is slower, achieving a 1:1 speed ratio. Secondly, the spring assembly 10's first working state is the extended state of the spring assembly 10. The second working state is the extended state of the spring assembly 10. In this state, the pilot oil supply line 806 gradually inputs pressurized oil, and the thrust of the pressurized oil gradually increases. When the thrust increases to a predetermined level, the oil supply circuit opens, and the opening of the circuit gradually increases with the continuous supply of pressurized oil. When the pressurized oil supply reaches 1 MPa, the oil supply circuit is fully open. At this time, high-pressure oil flows to all the distribution holes on the distribution plate 3. When the plunger rotor 12 rotates one revolution, all the plunger rotors 12 will generate driving torque in sequence. Since the number has doubled, the amount of hydraulic oil required for the plunger rotor 12 to rotate one revolution has also doubled. With the input flow rate remaining unchanged, the motor speed will double. However, at the same time, the system pressure is distributed to more plunger rotors 12, and the thrust generated by each plunger is relatively reduced. Therefore, the total output torque will decrease accordingly, which achieves a 1:2 speed ratio, that is, the speed of the high-speed gear is twice that of the low-speed gear.

[0032] Specifically, in a specific embodiment of the present invention, the cylindrical stator 11 includes: a cylindrical body; an inner curved guide rail disposed on the inner sidewall of the cylindrical body; the inner curved guide rail includes a plurality of repeating wave protrusions and grooves.

[0033] Specifically, in a specific embodiment of the present invention, the plunger rotor 12 includes: a rotor body 1201; a plunger hole 1202 disposed on the rotor body 1201; a plunger body 1203 slidably disposed within the plunger hole 1202; a pin disposed at the front end of the plunger body 1203; a bearing assembly 1204 disposed on the pin; and cylindrical rollers 1205 disposed on the bearing assembly 1204 and abutting against the inner curved guide rail; one end of the rollers is connected to the plunger hole 1202. The other end is connected to the distribution pipe 1206 of the first distribution hole group 4 or the second distribution hole group 5; a distribution piston 1207 is provided on the distribution pipe 1206; the distribution piston 1207 is provided with a reducing through hole 1208 inside, the diameter of the reducing through hole 1208 at the oil inlet end of the distribution piston 1207 is larger than the diameter of the reducing through hole 1208 at the oil outlet end of the distribution piston 1207; a buffer spring 1209 is provided at the bottom of the distribution piston 1207 and abuts against the distribution piston 1207.

[0034] In this embodiment of the invention, the plunger rotor 12 is used to generate rotational power under the action of high-pressure oil; such as Figure 6As shown, the main structure of the plunger rotor 12 consists of a rotor body 1201, a plunger bore 1202, a plunger body 1203, a pin, a bearing assembly 1204, cylindrical rollers 1205, a distribution pipe 1206, a distribution piston 1207, and a buffer spring 1209. The rotor body 1201 is sleeved on the hollow shaft 2, and the plunger body 1203 is installed in the plunger bore 1202. The cylindrical rollers 1205 are provided at the front end of the plunger body 1203, and the cylindrical rollers 1205 movably abut against the inner curved rail of the cylindrical stator 11. The plunger body 1203 is connected to the distribution pipe 1206 at the rear for inputting high-pressure oil. The distribution piston 1207 and the buffer spring 1209 are installed in the distribution pipe 1206, forming a buffer mechanism. When high-pressure oil enters the distribution piston 1207, the diameter of the through hole in the piston becomes smaller, which increases the flow rate of the high-pressure oil and increases the torque generated by the plunger rotor 12. When returning oil, the diameter of the through hole of the distribution piston 1207 gradually increases as the high-pressure oil passes through it, and the flow rate decreases, effectively reducing the hydraulic shock of the oil supply chamber. During the movement, the plunger body 1203 will extend outward under the pressure of the oil. Because the outer side is a fixed inner curved track, the cylindrical roller 1205 moves closely along the track surface. When the plunger body 1203 moves to the rising (pressurizing) section of the track curve, the track surface exerts a reaction force on the plunger. This reaction force can be decomposed into two forces: a radial force and a tangential force that drives the rotor to rotate. It is this tangential force that acts on the rotor body 1201, generating a driving torque that causes the rotor body 1201 to rotate along with the hollow section. The distribution plate 3 ensures that high-pressure oil is always supplied to the bottom of the plunger body 1203 in the "pressurizing section," while the plunger body 1203 in the "return section" retracts under the action of the track contour and discharges the used high-pressure oil back. In this way, multiple plunger rotors 12 work continuously and alternately on the track, forming a smooth and continuous rotational motion.

[0035] Specifically, in a specific embodiment of the present invention, a transmission gear 17 is sleeved on the lower end of the hollow shaft 2.

[0036] Specifically, in a specific embodiment of the present invention, the power head assembly 13 includes: a rolling bearing 1301 sleeved on the hollow shaft 2; a first sealing cover 1302 sleeved on the rolling bearing 1301 and connected to the bottom end of the cylindrical stator 11; a power head housing 1303 disposed at the lower end of the first sealing cover; a double internal gear ring 1304 disposed in the power head housing 1303, the double internal gear ring 1304 sleeved on the hollow shaft 2, the small teeth of the double internal gear ring 1304 meshing with the transmission gear 17; a double tapered roller bearing 1305 sleeved on the outer wall of the double internal gear ring 1304 and abutting against the inner wall of the power head housing 1303; and a double internal gear ring 1305 disposed in the double internal gear ring 1304. A splined shaft end cap 1306 is located inside the ring 1304; the splined shaft end cap 1306 is sleeved on the bottom end of the hollow shaft 2 and connected to the bottom surface of the large tooth of the double internal gear ring 1304; a ball joint drill sleeve 1307 is embedded in the double internal gear ring 1304 and engages with the splined shaft end cap 1306; an external gear is provided on the ball joint drill sleeve 1307, and the external gear meshes with the large tooth of the double internal gear ring 1304; the tooth width of the large tooth of the double internal gear ring 1304 is greater than the tooth width of the external gear, and the ball joint drill sleeve 1307 can float freely within the double internal gear ring 1304; a sealing assembly 1308 is located at the lower end of the power head housing 1303 and connected to the power head housing 1303.

[0037] like Figure 7 As shown, in this embodiment of the invention, the power head assembly 13 adopts a double internal gear ring 1304 and a floating design for power transmission and buffering. Specifically, the power head assembly 13 uses the double internal gear ring 1304 inside. The large tooth of the double internal gear ring 1304 is connected to the ball joint drill sleeve 1307, which can float freely inside the internal gear ring. The floating design provides the necessary flexibility and reduces the alignment accuracy requirements when installing and removing the drill rod. The small tooth of the double internal gear ring 1304 is connected to the output shaft of the dual-speed hydraulic motor, i.e., the hollow shaft 2. The outer wall of the double internal gear ring 1304 is fitted with the double tapered roller bearing 1305. That is to say, the double gear ring is supported by the double tapered roller bearing 1305. This structural design can distribute the huge radial and impact loads generated when the drill rod is working to the housing, instead of directly transmitting them to the motor shaft. This greatly protects the hydraulic motor and extends the service life of the motor and the whole machine.

[0038] Specifically, in a specific embodiment of the present invention, the sealing assembly 1308 includes: a second sealing cover 18 disposed at the bottom end of the power head housing 1303; a third sealing cover 19 disposed at the lower end of the second sealing cover 18 and engaging with the second sealing cover 18; a sleeve 20 disposed between the second sealing cover 18 and the third sealing cover 19; a water seal 21 sleeved on the third sealing cover 19; and a sealing sleeve 22 disposed inside the third sealing cover 19; the sealing sleeve 22 is sleeved on the... The outer wall of the double internal gear ring 1304 abuts against the double tapered roller bearing 1305; a floating oil seal cover 23 is sleeved on the sealing sleeve 22, and its outer wall abuts against the third sealing cover 19; a floating oil seal 24 is disposed between the second sealing cover 18 and the floating oil seal cover 23; a sealing spring 25 is disposed inside the third sealing cover 19; and a locking half ring 26 is disposed at the lower end of the third sealing cover 19, the floating oil seal cover 23 and the sealing sleeve 22, and abuts against the sealing spring 25.

[0039] Specifically, in a specific embodiment of the present invention, the robotic arm assembly 14 includes: a floating ball seat 1401 disposed at the bottom end of the power head assembly 13; a first guide groove 1402 disposed on the bottom surface of the floating ball seat 1401; a rod unloader slider 1403 disposed in the first guide groove 1402; a second guide groove 1404 disposed on the side wall of the floating ball seat 1401 and communicating with the first guide groove 1402; a lever block 1405 disposed in the second guide groove 1404 and movably connected to the rod unloader slider 1403; a robotic arm body 1406 connected at one end to the power head assembly 13 and at the other end to the lever block 1405; and a hydraulic cylinder disposed on the robotic arm body 1406 for driving the robotic arm body 1406 to float up and down.

[0040] In this embodiment of the invention, the robotic arm assembly 14 is used to assist in loading and unloading drill rods. When it is necessary to load or unload drill rods, the system first cuts off the oil circuit to the hydraulic motor, the motor stops rotating, and the power head assembly 13 no longer outputs torque. Subsequently, the pressure oil circuit of the hydraulic cylinder is connected, and the piston rod of the cylinder pushes the robotic arm body 1406 to move upward or downward. The cylinder is usually a double-acting hydraulic cylinder, and the extension and retraction of the piston rod directly drives the lifting and lowering of the robotic arm body 1406. Then, the movement of the robotic arm body 1406 drives the lever 1405 at its end, and the lever 1405 pushes the rod unloader slider 1403. Since the rod unloader slider 1403 has already clamped the drill rod, and the power head assembly 13 stops outputting rotational power, this linear thrust is converted into a huge reverse rotational torque, i.e., the unlatching torque. This torque overcomes the friction between the drill rod threads, loosening them, thus assisting in completing the drill rod loading and unloading operation.

[0041] Specifically, in a specific embodiment of the present invention, the hydraulic power drive assembly further includes: a fourth sealing cover 15 disposed on the upper end of the cylinder 1 and connected to the cylinder 1; and a water-sealed elbow 16 disposed on the fourth sealing cover 15 and communicating with the hollow hole of the hollow shaft 2.

[0042] In this embodiment of the invention, the hollow shaft 2 passes through the hydraulic motor and the power head assembly 13. The water-sealed elbow 16 is installed at the upper end of the hollow shaft 2. The water-sealed elbow 16 is used to connect to an external water source. The hollow shaft 2 structure allows cooling water to pass directly through it. The water flow can effectively remove the heat generated by the power head housing 1303 and the hydraulic motor, ensuring that the system can work continuously and stably at a suitable temperature and preventing performance degradation or damage due to overheating.

[0043] As described above, the hydraulic power drive assembly of this invention aims to solve the problems of complex structure, poor smoothness, and large hydraulic shock during low-speed / high-speed switching of traditional dual-speed hydraulic motors. The main structure of the hydraulic power drive assembly consists of a cylinder body 1, a hollow shaft 2, a distribution plate 3, a first distribution groove, a second distribution groove, a first distribution hole group 4, a second distribution hole group 5, a first oil supply chamber 6, a second oil supply chamber 7, a main oil pipeline, a blind mounting hole 9, a mechanical valve group 8, a spring assembly 10, a cylindrical stator 11, a plunger rotor 12, a power head assembly 13, and a robotic arm assembly 14; wherein the cylinder body 1, hollow shaft 2, distribution plate 3, first distribution groove, second distribution groove, first distribution hole group 4, second distribution hole group 5, first oil supply chamber 6, second oil supply chamber 7, main oil pipeline, blind mounting hole 9, mechanical valve group 8, spring assembly 10, cylindrical stator 11, plunger rotor, and piston rotor are all present. The rotors 12 are assembled to form a hydraulic motor, which provides rotational power to the power head assembly 13. In the structure of the hydraulic motor, the hollow shaft 2 is vertically arranged at the central axis of the cylinder body 1, and the oil distribution plate 3 is sleeved on the hollow shaft 2. The oil distribution plate 3 has a first oil distribution groove and a second oil distribution groove opened sequentially from top to bottom. The first distribution hole group 4 and the second distribution hole group 5 are respectively installed in the first oil distribution groove and the second oil distribution groove. The first distribution hole group 4 and the second distribution hole group 5 correspond to the distribution pipes 1206 of different plunger rotors 12, and oil is supplied and returned to different plunger rotors 12 through the first distribution hole group 4 and the second distribution hole group 5. Secondly, in conjunction with the above... A first oil distribution groove and a second oil distribution groove are provided. From top to bottom, the inner wall of the cylinder body 1 has a first oil supply chamber 6 and a second oil supply chamber 7, which are separated by the oil distribution plate 3. External oil supply enters the first oil supply chamber 6 from the main oil pipeline. A blind mounting hole 9 is provided on the inner wall of the cylinder body 1. From bottom to top, a spring assembly 10 and a mechanical valve assembly 8 are arranged in the blind mounting hole 9. Under the action of the pressure of the pressurized oil and the elastic force of the spring assembly 10, the valve core of the mechanical valve assembly 8 can perform linear reciprocating motion in the blind mounting hole 9, thereby opening and closing the oil supply circuit between the first oil supply chamber 6 and the second oil supply chamber 7. In short, when the mechanical valve assembly... When no pressure oil is supplied, the spring assembly 10 pushes up the mechanical valve group 8, and the spring assembly 10 is in the first working state. The valve core structure of the mechanical valve group 8 closes the oil supply circuit between the first oil supply chamber 6 and the second oil supply chamber 7, allowing only high-pressure oil to flow to half of the high-pressure holes on the distribution plate 3. That is, the hydraulic oil in the first oil supply chamber 6 enters the corresponding plunger rotor 12 only through the first distribution hole group 4. Because only a portion of the plungers work each time, more hydraulic oil is needed to drive the rotor to rotate one revolution. Therefore, the speed is slower when the input flow remains unchanged, that is, the hydraulic motor is in the low-speed working position. However, at the same time, each working plunger bears the entire system pressure, so the output torque is large.When the mechanical valve assembly 8 is supplied with pressurized oil at the corresponding pressure, the thrust generated by the pressurized oil overcomes the spring force, pushing the valve core to a new position. The spring assembly 10 is in its second working state. After the valve core moves, the oil supply circuit between the first oil supply chamber 6 and the second oil supply chamber 7 is connected, opening a new oil passage that allows access to all the high-pressure holes on the distribution plate 3, namely the first distribution hole group 4 and the second distribution hole group 5. The number of working plunger shafts increases, and the amount of hydraulic oil required for one revolution of the rotor also increases. With the input flow rate remaining constant, the motor speed will double. At this time, the hydraulic motor is in high-speed operation, but simultaneously, the system pressure is distributed to more plungers, reducing the thrust generated by each plunger and thus lowering the total output torque. Furthermore, due to the continuous supply of pressurized oil, the process of the pressurized oil overcoming the elasticity of the spring assembly 10—that is, the compression process of the spring assembly 10—is continuous and slow. In other words, the oil supply circuit's opening from closed to fully open or from fully open to closed is a smooth opening and closing process, allowing for smooth and seamless switching between high and low speeds with minimal hydraulic shock. Therefore, the technical solution of this invention, compared to existing technologies, can achieve smooth switching between high and low speed output gears without changing the oil flow rate, reducing hydraulic shock.

[0044] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A hydraulic power drive assembly, characterized in that, include: Cylinder block; A hollow shaft disposed within the cylinder body; An oil distribution plate fitted onto the hollow shaft; The first oil distribution groove and the second oil distribution groove are disposed on the side wall of the oil distribution plate; A first distribution hole group and a second distribution hole group are respectively disposed in the first oil distribution groove and the second oil distribution groove; The first oil supply chamber is disposed on the inner wall of the cylinder and communicates with the first oil distribution groove; The second oil supply chamber is disposed on the inner wall of the cylinder and communicates with the second oil distribution groove; The main oil pipeline is located on the side wall of the cylinder block and communicates with the first oil supply chamber and the second oil supply chamber. Installation blind holes are provided on the inner wall of the cylinder; Mechanical valve assembly installed within the mounting blind hole; The mechanical valve assembly is used to open and close the oil supply circuit between the first oil supply chamber and the second oil supply chamber. A spring assembly disposed at the bottom of the mounting blind hole and abutting against the mechanical valve assembly; A cylindrical stator disposed at the lower end of the cylinder body and connected to the cylinder body; A plunger rotor is disposed inside the cylindrical stator, with one end connected to the hollow shaft and the other end movably abutting against the inner wall of the cylindrical stator. The power head assembly is located at the lower end of the cylindrical stator and connected to the hollow shaft; The robotic arm assembly connected to the power head assembly.

2. The hydraulic power drive assembly according to claim 1, characterized in that, The mechanical valve assembly includes; A fixed valve sleeve is installed within the mounting blind hole; A shoulder is provided on the side wall of the fixed valve sleeve to separate the first oil supply chamber and the second oil supply chamber; A first valve sleeve oil groove and a second valve sleeve oil groove are arranged parallel to each other on the inner sidewall of the fixed valve sleeve; The first valve sleeve oil groove and the second valve sleeve oil groove are respectively connected to the first oil supply chamber and the second oil supply chamber; A mechanical valve core is disposed in the inner hole of the fixed valve sleeve and slidably connected to the fixed valve sleeve; The lower end of the mechanical valve core abuts against the spring assembly; A pilot oil supply line is provided on the side wall of the cylinder block and communicates with the inner hole of the fixed valve sleeve; The first valve core oil groove and the second valve core oil groove are arranged in parallel within the mechanical valve core; The first valve core oil groove and the second valve core oil groove are interconnected; The first valve sleeve oil groove, the first valve core oil groove, the second valve core oil groove, and the second valve sleeve oil groove are combined to form the oil supply circuit between the first oil supply chamber and the second oil supply chamber.

3. The hydraulic power drive assembly according to claim 2, characterized in that, The spring assembly is provided with a first working state and a second working state; When the spring assembly is in the first working state, the oil supply circuit between the first oil supply chamber and the second oil supply chamber is closed. When the spring assembly is in the second working state, at least one set of the first valve core oil groove is connected to the first valve sleeve oil groove, and the second valve core oil groove is connected to the second valve sleeve oil groove, that is, the oil supply circuit between the first oil supply chamber and the second oil supply chamber is opened.

4. The hydraulic power drive assembly according to claim 1, characterized in that, The cylindrical stator includes: cylindrical body; An inner curved guide rail is provided on the inner side wall of the cylindrical body; The inner curved guide rail includes multiple repeating wave protrusions and grooves.

5. The hydraulic power drive assembly according to claim 4, characterized in that, The plunger rotor includes: Rotor body; A plunger hole is provided on the rotor body; A plunger body that is slidably disposed within the plunger bore; A pin is located at the front end of the plunger body; The bearing assembly is mounted on the pin. Cylindrical rollers disposed on the bearing assembly and abutting against the inner curved guide rail; One end is connected to the plunger hole, and the other end is connected to the distribution pipeline of the first distribution hole group or the second distribution hole group; A distribution piston installed on the distribution pipeline; The distribution piston has an internal reducing hole, and the diameter of the reducing hole at the oil inlet end of the distribution piston is larger than the diameter of the reducing hole at the oil outlet end of the distribution piston. A buffer spring is disposed at the bottom of the distribution piston and abuts against the distribution piston.

6. The hydraulic power drive assembly according to claim 1, characterized in that, A transmission gear is fitted onto the lower end of the hollow shaft.

7. The hydraulic power drive assembly according to claim 6, characterized in that, The power head assembly includes: A rolling bearing fitted onto the hollow shaft; A first sealing cap sleeved on the rolling bearing and connected to the bottom end of the cylindrical stator; The power head housing is located at the lower end of the first sealing end cover; The double internal gear ring is disposed in the power head housing and is sleeved on the hollow shaft. The small teeth of the double internal gear ring mesh with the transmission gear. A double tapered roller bearing, fitted onto the outer wall of the double internal gear ring and abutting against the inner wall of the power head housing; Splined shaft end cap disposed within the double internal gear ring; The splined shaft end cap is fitted onto the bottom end of the hollow shaft and is connected to the bottom surface of the large tooth of the double internal gear ring. A ball joint drill sleeve is embedded in the double internal gear ring and engages with the splined shaft end cap. The ball joint drill sleeve is provided with an external gear, which meshes with the large tooth of the double internal gear ring; The tooth width of the large tooth of the double internal gear ring is greater than the tooth width of the external gear, and the ball jack drill sleeve can float freely within the double internal gear ring; A sealing assembly disposed at the lower end of the power head housing and connected to the power head housing.

8. The hydraulic power drive assembly according to claim 7, characterized in that, The sealing assembly includes: The second sealing cover is located at the bottom of the power head housing; A third sealing cover is disposed at the lower end of the second sealing cover and engages with the second sealing cover; A sleeve is disposed between the second sealing cover and the third sealing cover; A water seal fitted onto the third sealing cap; A sealing sleeve disposed inside the third sealing cover; The sealing sleeve is fitted onto the outer wall of the double internal gear ring, and its top end abuts against the double tapered roller bearing; A floating oil seal cap fitted onto the sealing sleeve, the outer wall of which abuts against the third sealing cap; A floating oil seal is disposed between the second sealing cover and the floating oil seal cover; A sealing spring is installed inside the third sealing cover; A locking half-ring is located at the lower end of the third sealing cover, the floating oil seal cover, and the sealing sleeve, and abuts against the sealing spring.

9. The hydraulic power drive assembly according to claim 1, characterized in that, The robotic arm assembly includes: A floating ball seat is located at the bottom of the power head assembly; A first guide groove is provided on the bottom surface of the floating ball seat; The unloader slider is disposed in the first guide groove; A second guide groove is disposed on the side wall of the floating ball seat and communicates with the first guide groove; A lever block is disposed in the second guide groove and is movably connected to the slider of the unloader. One end is connected to the power head assembly, and the other end is connected to the mechanical arm body of the lever; Hydraulic cylinders are installed on the main body of the robotic arm to drive the main body of the robotic arm to float up and down.

10. The hydraulic power drive assembly according to claim 1, characterized in that, The hydraulic power drive assembly also includes: A fourth sealing cover is disposed at the upper end of the cylinder body and connected to the cylinder body; A water-sealed elbow is installed on the fourth sealing cover and communicates with the hollow hole of the hollow shaft.

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