Hydraulic oil cylinder capable of increasing no-load running speed

Abstract

The utility model relates to a hydraulic oil cylinder capable of improving no-load running speed, which comprises a large cylinder body, a large piston head, a large piston rod, a small cylinder body, a small piston head, a small piston rod, a valve seat and a prefill valve. The outer side of the oil inlet and outlet channel is communicated with the peripheral face of the large cylinder body, the inner side of the oil inlet and outlet channel is communicated with the interior of the large cylinder body, a round hole is formed in the other end of the large cylinder body, a valve seat is installed at the opening of the round hole, and a small cylinder body is designed in the middle of the other end of the large piston head. The other end of the small piston rod is connected with the inner side of the valve seat, and the prefill valve is installed on the outer side of the valve seat. The hydraulic cylinder has the advantages that the design is ingenious, the structure is reasonable and compact, and the operation speed of the large piston rod is changed through oil feeding of the small cylinder body during no-load operation; under the condition that the flow is not increased, the working efficiency is improved, and the cost is saved.

Description

Technical Field

[0001] The utility model relates to the field of powder hydraulic presses, in particular to a hydraulic oil cylinder capable of improving no-load running speed. Background Art

[0002] Traditional hydraulic cylinders are basically one cylinder and one rod. The cylinder is the cylinder body, the rod is the piston rod, and the piston is connected to the piston rod. The piston divides the cylinder into a piston rod extension chamber and a piston rod retraction chamber. Oil is supplied by the oil pump to make the piston rod extend and work, and retraction work is completed.

[0003] When the piston rod extends to apply pressure and retracts after pressurization, it is running at no load. In order to reduce the no-load running time, traditional oil cylinders change the running speed by increasing the flow rate, which consumes a lot of energy and is high in cost. Summary of the Invention

[0004] In order to solve the above technical problems, the utility model proposes a hydraulic cylinder for improving the no-load running speed, which has an ingenious design and a reasonable and compact structure.

[0005] The technical solution of this utility model:

[0006] A hydraulic cylinder for improving no-load running speed comprises a large cylinder body, a large piston head, a large piston rod, a small cylinder body, a small piston head, a small piston rod, a valve seat, and a liquid filling valve. The large piston head is slidably installed in the middle of the large cylinder body, and one end of the large piston head is connected to the large piston rod. The large piston rod and the large piston head are formed as one piece. One end of the large piston rod slides and seals through one end of the large cylinder body, and an inlet and outlet oil channel is designed near the end position inside the large cylinder body. The outside of the inlet and outlet oil channel is connected to the outer peripheral surface of the large cylinder body, and the inside of the inlet and outlet oil channel is connected to the interior of the large cylinder body. A circular hole is opened at the other end of the large cylinder body, and a valve seat is installed at the mouth of the circular hole. The middle of the other end of the large piston head is designed as a small cylinder body, and the small piston head is slidably installed in the small cylinder body. One end of the small piston head is connected to one end of the small piston rod, and the other end of the small piston rod is connected to the inner side of the valve seat. The liquid filling valve is installed on the outside of the valve seat; two valve seats are designed in the valve seat. When the oil pump is turned on, the oil pump with one end in pumping is turned on, and the oil pump with the other end in pumping is turned on.

[0007] The large piston head is in sliding and sealing cooperation with the interior of the large cylinder body; the small piston head is in sliding and sealing cooperation with the interior of the small cylinder body.

[0008] The hydraulic cylinder also includes a large guide sleeve, a large locking nut, a small guide sleeve, and a small locking nut. The outer circumference of the large cylinder body is designed with a sealing ring groove, one end of the large cylinder body is designed with an annular step and the inner wall of the annular step is provided with an internal thread, and an annular boss is designed on the outer circumference of one end of the large guide sleeve. The large guide sleeve is installed on the inner side of the mouth of the large cylinder body and a sealing ring is installed between the large guide sleeve and the large cylinder body. The sealing ring is located in the sealing ring groove, the annular boss is pressed on the end face of the annular step, and the large locking nut is screwed into the internal thread of the annular step to lock the large guide sleeve; an annular groove is provided on the inner side of one end of the large guide sleeve, and the large piston rod slides through the large guide sleeve. A sealing ring is installed between the large guide sleeve and the large piston rod. In the annular groove; the outer circumferential surface of the small cylinder body is designed with multiple sealing ring grooves, one end of the small cylinder body is designed with an annular step and the inner wall of the annular step is set with an internal thread, one end of the small guide sleeve is designed with an annular boss, the small guide sleeve is installed on the inner side of the small cylinder body mouth and a number of sealing rings are installed between the small guide sleeve and the small cylinder body, the several sealing rings are located in the multiple sealing ring grooves, the annular boss is pressed on the end face of the annular step, and the small locking nut is screwed into the internal thread of the annular step to lock the small guide sleeve; multiple annular grooves are provided on the inner side of one end of the small guide sleeve, the small piston rod slides through the small guide sleeve, and a number of sealing rings are installed between the small guide sleeve and the small piston rod, and the sealing rings are installed in the corresponding annular grooves.

[0009] The advantages of the utility model are ingenious design and reasonable and compact structure. When the large-cylinder piston rod is running without load, the running speed of the large piston rod is changed by oil entering through the small cylinder body. Under the rated flow rate, the volume of the working chamber of the small cylinder body is inversely proportional to the running speed of the large piston rod. By changing the structure of the oil cylinder, the working efficiency of the oil cylinder is significantly improved in actual use without increasing the flow rate, and the purchase cost and the user's use cost are saved for the user. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the present utility model. DETAILED DESCRIPTION

[0011] Refer to the attached Figure 1A hydraulic cylinder for improving no-load running speed includes a large cylinder body 1, a large piston head 2, a large piston rod 3, a small cylinder body 4, a small piston head 5, a small piston rod 6, a valve seat 7, and a filling valve 8. A large piston head 2 is slidably installed in the middle of the large cylinder body 1. One end of the large piston head 2 is connected to the large piston rod 3. The large piston rod 3 and the large piston head 2 are integrally formed. One end of the large piston rod 3 slides and seals through one end of the large cylinder body 1. An oil inlet and outlet channel 9 is designed near the end of the large cylinder body 1. The oil inlet and outlet The outside of the oil channel 9 is connected to the outer circumference of the large cylinder body 1, and the inside of the oil inlet and outlet channel 9 is connected to the inside of the large cylinder body 1. A round hole is opened at the other end of the large cylinder body 1 and a valve seat 7 is installed at the mouth of the round hole. The middle of the other end of the large piston head 2 is designed as a small cylinder body 4. A small piston head 5 is slidably installed in the small cylinder body 4. One end of the small piston head 5 is connected to one end of the small piston rod 6, and the other end of the small piston rod 6 is connected to the inside of the valve seat 7. The filling valve 8 is installed on the outside of the valve seat 7; two L-shaped flow channels 10 are designed in the valve seat 7. The two L One end of the L-shaped flow channel 10 is connected to the inner end surface of the valve seat 7 and the other end is connected to the outer peripheral surface of the valve seat 7; the small piston rod 6 and the small piston head 5 are integrally formed, and two axial flow channels 11 are designed in the middle of the small piston rod 6, and the two axial flow channels 11 are connected at both ends; one end of one axial flow channel 11 is connected to the end surface of the small piston head 5 and the other end is connected to an L-shaped flow channel 10 of the valve seat 7; one end of the other axial flow channel 11 is blocked with the end surface of the small piston head 5 and the other end is connected to another L-shaped flow channel of the valve seat 7 The valve seat 7 is connected to the valve channel 10, and a radial flow channel 111 is also provided on one side of the axial flow channel 11. One end of the radial flow channel 111 is connected to the outside of the root where the small piston rod 6 is connected to the small piston head 5, and the radial flow channel 111 is connected to the axial flow channel 11; a valve cavity 12 is opened in the middle of the outer end of the valve seat 7, and the filling valve 8 is sealed and installed at the mouth of the valve cavity 12. One side of the valve cavity 12 is connected to the outer peripheral surface of the valve seat 7 through a main oil inlet channel 71, and the bottom of the valve cavity 12 is connected to the inner end surface of the valve seat 7 through two oil channels 120.

[0012] The large piston head 2 is in sliding and sealing cooperation with the interior of the large cylinder body 1; the small piston head 5 is in sliding and sealing cooperation with the interior of the small cylinder body 4.

[0013] The hydraulic cylinder also includes a large guide sleeve 13, a large locking nut 14, a small guide sleeve 15, and a small locking nut 16. The outer peripheral surface of the large cylinder body 1 is designed with a sealing ring groove, and one end of the large cylinder body 1 is designed with an annular step and the inner wall of the annular step is provided with an internal thread. An annular boss is designed on the outer periphery of one end of the large guide sleeve 13. The large guide sleeve 13 is installed on the inner side of the mouth of the large cylinder body 1 and a sealing ring is installed between the large guide sleeve 13 and the large cylinder body 1. The sealing ring is located in the sealing ring groove, the annular boss is pressed on the end face of the annular step, and the large locking nut 14 is screwed into the internal thread of the annular step to lock the large guide sleeve 13; an annular groove is provided on the inner side of one end of the large guide sleeve 13, and the large piston rod 3 slides through the large guide sleeve 13. A sealing ring is installed between the large guide sleeve 13 and the large piston rod 3, The sealing ring is installed in the annular groove; the outer peripheral surface of the small cylinder body 4 is designed with multiple sealing ring grooves, one end portion of the small cylinder body 4 is designed with an annular step and the inner wall of the annular step is set with an internal thread, and an annular boss is designed on the outer periphery of one end of the small guide sleeve 15, the small guide sleeve 15 is installed on the inner side of the mouth of the small cylinder body 4 and a number of sealing rings are installed between the small guide sleeve 15 and the small cylinder body 4, the several sealing rings are located in the multiple sealing ring grooves, the annular boss is pressed on the end face of the annular step, and the small locking nut 16 is screwed into the internal thread of the annular step to lock the small guide sleeve 15; a number of annular grooves are provided on the inner side of one end of the small guide sleeve 15, the small piston rod 6 slides through the small guide sleeve 15, and a number of sealing rings are installed between the small guide sleeve 15 and the small piston rod 6, and the sealing rings are installed in the corresponding annular grooves.

[0014] When the utility model is used, the large piston rod first moves downward under the load, and oil flows into the main oil inlet channel on one side of the valve seat and enters the valve cavity, and then enters the cavity between the end of the large piston head and the bottom of the large cylinder body through the two oil channels at the bottom of the valve cavity, and the inlet and outlet oil channels discharge the hydraulic oil between the large piston head and the other end of the large cylinder body. At the same time, an L-shaped channel on one side of the valve seat also starts to supply oil. The L-shaped channel transports the hydraulic oil to the cavity between the end of the small piston head and the bottom of the small cylinder body through the axial channel, and the radial oil channel discharges the hydraulic oil between the small piston head and the other end of the small cylinder body, and discharges it into another L-shaped channel through another axial channel, and finally discharges it to the oil tank; the large cylinder body and the small cylinder body are simultaneously supplied with oil to increase the oil inlet amount, and the downward pressure of the oil cylinder can be improved without increasing the diameter (volume) of the large cylinder;

[0015] When the large piston rod moves upward and returns, it is no-load operation, which can increase the upward speed. First, the filling valve opens, and at the same time, an L-shaped flow channel starts to supply oil, which is transported to the small guide sleeve between the small piston head and the small cylinder body through the axial flow channel and the radial flow channel. The other axial flow channel discharges the hydraulic oil between the small piston head and the bottom of the small cylinder body through another L-shaped flow channel; at this time, the inlet and outlet oil channels start to supply oil to between the large guide sleeve and the large piston head, and the hydraulic oil head between the large piston head and the bottom of the large cylinder body is discharged into the valve cavity through the oil channel of the valve seat, and the valve cavity is quickly depressurized by the filling valve. The flow rate of the flow channel of the filling valve is greater than the flow rate of the main oil inlet flow channel. The main oil inlet flow channel can return oil as needed or not move; it is achieved that without increasing the diameter of the oil return pipe of the cylinder, the upward movement can be rapid when the displacement is increased, saving time, improving work efficiency and saving energy.

Claims

1. A hydraulic cylinder for increasing no-load running speed, characterized in that: The cam is provided with a plurality of camshafts, each of which is provided with a plurality of camshafts, and a plurality of camshafts are provided with a plurality of camshafts, wherein the plurality of camshafts are provided with a plurality of camshafts, and the plurality of camshafts are provided with a plurality of camshafts. One end of the L-shaped flow channel is connected to the inner end face of the valve seat and the other end is connected to the outer peripheral surface of the valve seat; the small piston rod and the small piston head are integrally formed, and two axial flow channels are designed in the middle of the small piston rod, and both axial flow channels are connected at both ends; one end of one axial flow channel is connected to the end face of the small piston head and the other end is connected to an L-shaped flow channel of the valve seat; one end of the other axial flow channel is blocked with the end face of the small piston head and the other end is connected to another L-shaped flow channel of the valve seat. At the same time, a radial flow channel is also provided on one side of the axial flow channel, one end of the radial flow channel is connected to the outside of the root where the small piston rod is connected to the small piston head, and the radial flow channel is connected to the axial flow channel; a valve cavity is opened in the middle of the outer end of the valve seat, and the filling valve is sealed and installed at the valve cavity mouth. One side of the valve cavity is connected to the outer peripheral surface of the valve seat through a main oil inlet channel, and the bottom of the valve cavity is connected to the inner end face of the valve seat through two oil channels.

2. A hydraulic cylinder for increasing no-load running speed according to claim 1, characterized in that: The large piston head is in sliding and sealing cooperation with the interior of the large cylinder body; the small piston head is in sliding and sealing cooperation with the interior of the small cylinder body.

3. The hydraulic cylinder for increasing no-load running speed according to claim 1, characterized in that: The hydraulic cylinder also includes a large guide sleeve, a large locking nut, a small guide sleeve, and a small locking nut. The outer circumference of the large cylinder body is designed with a sealing ring groove, one end of the large cylinder body is designed with an annular step and the inner wall of the annular step is provided with an internal thread, and an annular boss is designed on the outer circumference of one end of the large guide sleeve. The large guide sleeve is installed on the inner side of the mouth of the large cylinder body and a sealing ring is installed between the large guide sleeve and the large cylinder body. The sealing ring is located in the sealing ring groove, the annular boss is pressed on the end face of the annular step, and the large locking nut is screwed into the internal thread of the annular step to lock the large guide sleeve; an annular groove is provided on the inner side of one end of the large guide sleeve, and the large piston rod slides through the large guide sleeve. A sealing ring is installed between the large guide sleeve and the large piston rod. In the annular groove; the outer circumferential surface of the small cylinder body is designed with multiple sealing ring grooves, one end of the small cylinder body is designed with an annular step and the inner wall of the annular step is set with an internal thread, one end of the small guide sleeve is designed with an annular boss, the small guide sleeve is installed on the inner side of the small cylinder body mouth and a number of sealing rings are installed between the small guide sleeve and the small cylinder body, the several sealing rings are located in the multiple sealing ring grooves, the annular boss is pressed on the end face of the annular step, and the small locking nut is screwed into the internal thread of the annular step to lock the small guide sleeve; multiple annular grooves are provided on the inner side of one end of the small guide sleeve, the small piston rod slides through the small guide sleeve, and a number of sealing rings are installed between the small guide sleeve and the small piston rod, and the sealing rings are installed in the corresponding annular grooves.

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