foot-operated oil cylinder

Abstract

The utility model relates to a foot -operated oil cylinder, including piston rod, outer tube, guide sleeve and base, the guide sleeve is fixed in the axial one end of outer tube, the axial other end of base is fixed in outer tube, and the axial end between guide sleeve and base is equipped with inner tube, and piston rod is located in the inner tube, is equipped with the first hole of installing reset unit, the second hole of installing check valve and the third hole of installing check valve respectively in the base, the first hole is communicated with the second hole, and the third hole is communicated with the inner tube, the two opposite surfaces of base are equipped with rotating hole block respectively, and the rotating axle is inserted through two rotating hole blocks, and the circumferential wall of rotating axle is equipped with the mounting plate fixedly, one end of mounting plate is connected with the gyro wheel, and mounting plate and gyro wheel are all located in the base, the utility model has the advantages of compact structure, long stroke and power stable.

Description

Technical Field

[0001] This utility model belongs to the field of hydraulic cylinder technology, and in particular relates to a foot pedal cylinder. Background Technology

[0002] A foot-operated hydraulic cylinder, also known as a foot-operated hydraulic pump, is a type of hydraulic pump. The principle of a foot-operated hydraulic pump is to convert the mechanical energy of a power source (such as an electric motor or internal combustion engine) into the pressure energy of a liquid. The working principle is that a cam, driven by an electric motor, rotates. When the cam pushes the plunger upwards, the sealed volume formed by the plunger and cylinder body decreases, and oil is squeezed out of the sealed volume and discharged to the required location via a one-way valve. When the cam rotates to the descending part of the curve, a spring forces the plunger downwards, creating a certain vacuum. Oil from the tank enters the sealed volume under atmospheric pressure. The cam causes the plunger to continuously rise and fall, periodically decreasing and increasing the sealed volume, thus the pump continuously draws in and discharges oil. However, existing foot-operated hydraulic cylinders, due to their structural design, have a short stroke, require an external oil storage and discharge system, are relatively large, and suffer from unstable power. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a foot pedal cylinder with a compact structure, long stroke and stable power.

[0004] The purpose of this utility model is achieved through the following technical solution: A foot-operated hydraulic cylinder includes a piston rod, an outer cylinder, a guide sleeve, and a base. The guide sleeve is fixed to one axial end of the outer cylinder, and the base is fixed to the other axial end of the outer cylinder. An inner cylinder is installed at the axial end between the guide sleeve and the base, and the piston rod is located inside the inner cylinder. The base has a first hole for installing a reset unit, a second hole for installing a one-way valve, and a third hole for installing a check valve. The first hole communicates with the second hole, and the third hole communicates with the inner cylinder. Rotating holes are provided on two opposite surfaces of the base. A rotating shaft is inserted through the two rotating holes. A mounting plate is fixed on the circumferential wall of the rotating shaft. A roller is connected to one end of the mounting plate. Both the mounting plate and the roller are located inside the base. The rotating shaft's forward or reverse rotation causes the mounting plate to swing, causing the roller on the mounting plate to abut against the reset unit or the other end of the mounting plate to abut against the check valve, thereby controlling the lifting or lowering of the piston rod.

[0005] The beneficial effects of this utility model are as follows: Compared with the prior art, by installing an inner cylinder between the guide sleeve and the base, and with the piston rod located inside the inner cylinder, the stroke of the foot pedal cylinder is longer. The mounting plate and roller are integrated into the base, and the piston rod is lifted or lowered by rotating the shaft in both directions. This not only makes the structure more compact but also makes the power more stable.

[0006] Preferably, the outer cylinder and the inner cylinder form an outer cavity for oil storage, and the inner cylinder and the base form an inner cavity for pressure application. The outer cavity and the inner cavity are connected through the first hole, and the flow direction of hydraulic oil is controlled by the reset unit and the check valve. By dividing the cylinder cavity into an outer cavity and an inner cavity, the external oil storage and discharge system is eliminated, resulting in a more compact structure and more stable power.

[0007] Preferably, the reset unit includes a plunger, a reverse check valve, and three springs. The three springs are coaxially nested together. The reverse check valve is installed at the bottom of the first hole, and the plunger is installed inside the first hole. One end of each of the three springs is located inside the plunger, and the other end is located at the bottom of the first hole. The plunger abuts against the outer circumferential wall of the roller due to the tension of the springs. With the above structure, assembly is not only more convenient, but the use of three springs also provides better tension and stability.

[0008] Preferably, the one-way valve is installed in the hole of the second hole, the oil outlet of the one-way valve is distributed opposite to the bottom blind hole of the piston rod, and the shaft of the one-way valve and the shaft of the piston rod are on the same straight line. With the above structure, the hydraulic oil flowing out of the one-way valve can act well on the piston rod, the thrust is more uniform, and the stability of the piston rod is better during the lifting process.

[0009] Preferably, the check valve is installed in the third hole, and the valve stem of the check valve abuts against one end of the mounting plate; with the above structure, the valve stem of the check valve can be abutted or pressed by the movement of the mounting plate, making the control more convenient and precise.

[0010] Preferably, one end of the mounting plate is provided with a through hole, through which an elastic pin is connected. The roller is connected to the mounting plate by the elastic pin, and the outer diameter of the elastic pin is smaller than the inner diameter of the roller. By setting the elastic pin, the elastic pin and the through hole of the mounting hole are well abutted and fixed, and the stability of the roller after installation is better. At the same time, the outer diameter of the elastic pin is smaller than the inner diameter of the roller, so that the mounting plate still has a certain amount of room for movement after the roller abuts, which facilitates the reversal of the rotating shaft to press the check valve, thereby realizing the descent of the piston rod.

[0011] Preferably, one end of the mounting plate connected to the roller is provided as an inclined surface, and the inclined surface faces the reset unit side; by providing an inclined surface, the roller can fully contact the reset unit side, and the travel of the mounting plate is greatly increased.

[0012] Preferably, the circumferential surface of the roller abuts against the reset unit or against a limiting block provided on the rear cover mounted on the base; by the roller abutting against the limiting block, the reset unit can obtain effective reset stroke control. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the foot pedal cylinder of this utility model.

[0014] Figure 2 This is a three-dimensional exploded view of the foot pedal cylinder of this utility model.

[0015] Figure 3 This is a schematic diagram of the front cross-sectional structure of the foot pedal cylinder of this utility model.

[0016] The labels in the attached diagram are as follows: 1. Piston rod; 2. Outer cylinder; 3. Guide sleeve; 4. Base; 5. Inner cylinder; 6. Reset unit; 7. One-way valve; 8. Check valve; 9. Rotating shaft; 10. Mounting plate; 11. Roller; 12. Outer cavity; 13. Inner cavity; 14. Elastic pin; 15. Inclined surface; 16. Rear cover; 17. Limiting block; 41. First hole; 42. Second hole; 43. Third hole; 44. Rotating hole block; 61. Piston; 62. Reverse one-way valve; 63. Spring; 81. Valve stem. Detailed Implementation

[0017] The present invention will now be described in detail with reference to the accompanying drawings: as shown in the drawings Figures 1 to 3 As shown, this utility model includes a piston rod 1, an outer cylinder 2, a guide sleeve 3, and a base 4; the guide sleeve 3 is fixed to one axial end of the outer cylinder 2, and the base 4 is fixed to the other axial end of the outer cylinder 2, with an inner cylinder 5 installed at the axial end between the guide sleeve 3 and the base 4, and the piston rod 1 located inside the inner cylinder 5; the base 4 is provided with a first hole 41 for installing a reset unit 6, a second hole 42 for installing a one-way valve 7, and a third hole 43 for installing a check valve 8, the first hole 41 communicating with the second hole 42, and the third hole 43 communicating with the inner cylinder 5; Rotating hole blocks 44 are provided on two opposite surfaces of the base 4. A rotating shaft 9 is inserted through the two rotating hole blocks 44. A mounting plate 10 is fixed on the circumferential wall of the rotating shaft 9. A roller 11 is connected to one end of the mounting plate 10. The mounting plate 10 and the roller 11 are both located inside the base 4. The rotating shaft 9 drives the mounting plate 10 to swing by rotating forward or backward, so that the roller 11 on the mounting plate 10 abuts against the reset unit 6 or the other end of the mounting plate 10 abuts against the check valve 8, thereby controlling the lifting or lowering of the piston rod 1.

[0018] The outer cylinder 2 and the inner cylinder 5 form an outer cavity 12 for oil storage, and the inner cylinder 5 and the base 4 form an inner cavity 13 for pressure application. The outer cavity 12 and the inner cavity 13 are connected by a first hole 41, and the flow of hydraulic oil is controlled by a reset unit 6 and a check valve 8. Simply put, the oil in the outer cavity 12 is drawn into the inner cavity 13 and then pumped back into the outer cavity 12 for lifting heavy objects. When the piston rod 1 is lifted, the oil in the outer cavity 12 enters the first hole 41 through the reverse check valve 62, and then, through the compression of the plunger 61, the oil in the first hole 41 is forced into the second hole 42 and then through the check valve 7 into the inner cylinder 5, i.e., the inner cavity 13, causing the piston rod 1 to lift. When the piston rod 1 descends, the check valve 8 releases pressure, allowing the oil in the inner cylinder 5 to flow into the third hole 43 and into the base, and finally into the outer cavity 12, causing the piston rod 1 to descend.

[0019] The reset unit 6 includes a plunger 61, a reverse check valve 62, and three springs 63. The three springs 63 are coaxially nested together. The reverse check valve 62 is installed at the bottom of the first hole 41. The plunger 61 is installed inside the first hole 41 and sealed with a U-shaped sealing ring. One end of each spring 63 is located inside the plunger 61, and the other end is located at the bottom of the first hole 41. The plunger 61 abuts against the outer circumferential wall of the roller 11 under the tension of the springs 63. The reverse check valve 62 allows for unidirectional flow of hydraulic oil, meaning that hydraulic oil can only flow from the outer cavity 12 into the first hole 41, but cannot flow from the first hole 41 into the outer cavity 12. The main function of the three springs 63 is to reset the plunger 61.

[0020] The check valve 7 is installed in the second hole 42 and sealed by a sealing ring. The oil outlet of the check valve 7 is opposite to the bottom blind hole of the piston rod 1, and the shaft of the check valve 7 is on the same straight line as the shaft of the piston rod 1. The check valve 7 ensures that hydraulic oil can only flow into the inner cylinder 5 from the second hole 42.

[0021] The check valve 8 is installed inside the third hole 43, and the two are sealed by a sealing ring. The valve stem 81 of the check valve 8 abuts against one end of the mounting plate 10. The check valve 8 described above is a lift-type check valve, which allows hydraulic oil to flow only from the inner cylinder 5 into the third hole 43 and into the inner cavity 13. However, this can only be achieved after the end of the valve stem 81 with the mounting plate is pressed. If it is not pressed, the hydraulic oil in the inner cylinder 5 cannot flow into the third hole 43.

[0022] One end of the mounting plate 10 is provided with a through hole, through which an elastic pin 14 is connected. The roller 11 is connected to the mounting plate 10 by the elastic pin 14, and the outer diameter of the elastic pin 14 is smaller than the inner diameter of the roller 11.

[0023] One end of the mounting plate 10 connected to the roller 11 is provided as an inclined surface 15, and the inclined surface 15 faces the reset unit 6.

[0024] The circumferential surface of the roller 11 abuts against the reset unit 6 or against the limiting block 17 provided on the rear cover 16 mounted on the base 4.

[0025] The working principle of this utility model is as follows: When the rotating shaft 9 is rotated counterclockwise downwards, the mounting plate 10 drives the roller 11 to press the opposing plunger 61 upwards. The spring 63 is in a compressed state, and under the action of the reverse one-way valve 62, the hydraulic oil in the first hole 41 can only flow into the second hole 42 and out through the one-way valve 7 into the inner cylinder 5, causing the piston rod 1 to rise. The rotating shaft 9 is then reset and the above action is repeated, thus causing the piston rod 1 to rise step by step. When the rotating shaft 9 is rotated clockwise downwards, since the outer diameter of the elastic pin 14 is smaller than the inner diameter of the roller 11, the mounting plate 10 presses the valve stem 81 of the check valve 8, thereby releasing the pressure of the check valve 8. The oil in the inner cylinder 5 is then introduced into the third hole 43 and flows into the base, and finally into the outer cavity 12, causing the piston rod 1 to descend.

[0026] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A foot pedal cylinder, comprising a piston rod (1), an outer cylinder (2), a guide sleeve (3), and a base (4); characterized in that: The guide sleeve (3) is fixed to one axial end of the outer cylinder (2), and the base (4) is fixed to the other axial end of the outer cylinder (2). An inner cylinder (5) is installed at the axial end between the guide sleeve (3) and the base (4). The piston rod (1) is located inside the inner cylinder (5). The base (4) is provided with a first hole (41) for installing a reset unit (6), a second hole (42) for installing a one-way valve (7), and a third hole (43) for installing a check valve (8). The first hole (41) communicates with the second hole (42), and the third hole (43) communicates with the inner cylinder (5). The two opposite surfaces of the base (4) are respectively A rotating hole block (44) is provided, and a rotating shaft (9) is inserted through the two rotating hole blocks (44). A mounting plate (10) is fixed on the circumferential wall of the rotating shaft (9). A roller (11) is connected to one end of the mounting plate (10). The mounting plate (10) and the roller (11) are both located in the base (4). The rotating shaft (9) rotates forward or backward, causing the mounting plate (10) to swing. This causes the roller (11) on the mounting plate (10) to abut against the reset unit (6) or the other end of the mounting plate (10) to abut against the check valve (8), thereby controlling the lifting or lowering of the piston rod (1).

2. The foot pedal cylinder according to claim 1, characterized in that: The outer cylinder (2) and the inner cylinder (5) form an outer cavity (12) for storing oil, and the inner cylinder (5) and the base (4) form an inner cavity (13) for being pressurized. The outer cavity (12) and the inner cavity (13) are connected through the first hole (41), and the flow direction of hydraulic oil is controlled by the reset unit (6) and the check valve (8).

3. The foot pedal cylinder according to claim 1, characterized in that: The reset unit (6) includes a plunger (61), a reverse check valve (62), and three springs (63). The three springs (63) are coaxially nested together. The reverse check valve (62) is installed at the bottom of the first hole (41). The plunger (61) is installed inside the first hole (41). One end of each of the three springs (63) is located inside the plunger (61), and the other end is located at the bottom of the first hole (41). The plunger (61) abuts against the outer circumferential wall of the roller (11) by the tension of the springs (63).

4. The foot pedal cylinder according to claim 1, characterized in that: The one-way valve (7) is installed in the hole of the second hole (42). The oil outlet of the one-way valve (7) is distributed opposite to the bottom blind hole of the piston rod (1), and the shaft of the one-way valve (7) and the shaft of the piston rod (1) are on the same straight line.

5. The foot pedal cylinder according to claim 1, characterized in that: The check valve (8) is installed in the hole of the third hole (43), and the valve stem (81) of the check valve (8) abuts against one end of the mounting plate (10).

6. The foot pedal cylinder according to claim 1, characterized in that: One end of the mounting plate (10) is provided with a through hole, and an elastic pin (14) is connected through the through hole. The roller (11) is connected to the mounting plate (10) through the elastic pin (14), and the outer diameter of the elastic pin (14) is smaller than the inner diameter of the roller (11).

7. The foot pedal cylinder according to claim 1, characterized in that: One end of the mounting plate (10) connected to the roller (11) is provided as an inclined surface (15), and the inclined surface (15) faces the reset unit (6).

8. The foot pedal cylinder according to claim 1, characterized in that: The circumferential surface of the roller (11) abuts against the reset unit (6) or against the limiting block (17) provided on the rear cover (16) mounted on the base (4).

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