Buffering device and hydraulic buffering lifting device capable of adapting to impact load

Abstract

The invention relates to hydraulic equipment, in particular to a buffer device and a hydraulic buffer lifting device adaptable to impact load.The buffer device comprises a first end cover, a second end cover, a shell, an inflation inlet, a liquid inlet and a piston, and the first end cover, the second end cover and the piston are all arranged in an inner cavity of the shell; an air cavity is formed between the piston and the first end cover, a liquid cavity is formed between the piston and the second end cover, the piston is suitable for moving towards the two ends of the shell, the liquid inlet is formed in the second end cover and used for being connected with a positive cavity liquid loop of the lifting hydraulic cylinder, and when the size of the air cavity is the largest, the liquid cavity is connected with the liquid inlet. The gas pressure in the gas cavity is P1 when the volume of the gas cavity is minimum, the gas pressure in the gas cavity is P2 when the volume of the gas cavity is minimum, P1 is larger than the positive cavity pressure when the lifting hydraulic cylinder is in a no-load state, and P2 is smaller than the positive cavity pressure when the lifting hydraulic cylinder is in a full-load state. The lifting mechanism can be prevented from rebounding at the moment of load release.

Description

Technical Field

[0001] The invention relates to hydraulic equipment, in particular to a buffer device and a hydraulic buffer lifting device capable of adapting to impact loads. Background Art

[0002] During the operation of a certain lifting mechanism, the load needs to be lowered from the original clamping mechanism to the lifting mechanism. The load generates a large impact load on the lifting mechanism at the moment of release, causing the lifting mechanism to swing up and down and rebound. This rebound may cause the load to collide with the original clamping mechanism, causing structural damage. How to prevent the lifting mechanism from rebounding is a technical problem that needs to be solved urgently. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a buffer device capable of preventing the lifting mechanism from rebounding at the moment of load release and a hydraulic buffer lifting device capable of adapting to impact loads.

[0004] In order to solve the above technical problems, this application provides the following technical solutions:

[0005] The buffer device of the present invention comprises a first end cover, a second end cover, a shell, an air charging port, a liquid inlet, and a piston. The shell is tubular. The first end cover, the second end cover, and the piston are all arranged in the inner cavity of the shell. The outer wall of the first end cover, the outer wall of the second end cover, the outer wall of the piston and the inner wall of the shell are sealed with each other. The first end cover and the second end cover are respectively located at two ends of the shell. The piston is located between the first end cover and the second end cover. An air cavity is formed between the piston and the first end cover, and a liquid cavity is formed between the piston and the second end cover. The piston is suitable for moving toward the two ends of the shell. The air charging port is arranged on the first end cover, and the air charging port is used to connect to an air source. The liquid inlet is arranged on the second end cover, and the liquid inlet is used to connect to the positive cavity liquid circuit of the lifting hydraulic cylinder. When the volume of the air cavity is the largest, the gas pressure in the air cavity is P1, and when the volume of the air cavity is the smallest, the gas pressure in the air cavity is P2, P1 is greater than the positive cavity pressure when the lifting hydraulic cylinder is unloaded, and P2 is less than the positive cavity pressure when the lifting hydraulic cylinder is fully loaded.

[0006] Furthermore, it also includes a liquid inlet joint and a buffer damper, wherein the buffer damper is provided with an axial center hole, the buffer damper is arranged in the liquid inlet joint, and the liquid inlet joint is arranged in the liquid inlet.

[0007] Furthermore, the damping force of the buffer damping is adjustable.

[0008] Furthermore, the buffer damper is threadedly connected to the liquid inlet joint, and the damping force can be adjusted by replacing the buffer damper with different apertures.

[0009] Furthermore, the liquid inlet connector is threadedly connected to the liquid inlet.

[0010] Furthermore, it also includes an inflation port blocking cover, and the inflation port blocking cover is threadedly connected to the inflation port.

[0011] Furthermore, a first groove is provided on an end surface of the first end cover close to the piston, and a second groove is provided on an end surface of the piston close to the first end cover.

[0012] Furthermore, a convex block is arranged on the end surface of the piston close to the second end cover, and a third groove is arranged on the end surface of the second end cover close to the piston, and the convex block matches the third groove.

[0013] Furthermore, sealing rings are respectively arranged between the first end cover and the housing, between the second end cover and the housing, and between the piston and the housing.

[0014] The present invention discloses a hydraulic buffer lifting device which can adapt to impact loads, comprising a lifting hydraulic cylinder, a lifting mechanism and the above-mentioned buffer device, wherein the liquid inlet is connected to the positive cavity liquid circuit of the lifting hydraulic cylinder, and the piston rod of the lifting hydraulic cylinder is connected to the lifting mechanism.

[0015] Compared with the prior art, the buffer device of the present invention has at least the following beneficial effects:

[0016] The present invention provides a buffer device. A first end cover, a second end cover and a piston are arranged in a shell, an air cavity is formed between the piston and the first end cover, a liquid cavity is formed between the piston and the second end cover, an air filling port is used to connect an air source, and a liquid inlet is used to connect a positive cavity liquid circuit of a lifting hydraulic cylinder. Therefore, when a lifting mechanism bears a load and the load is released at the moment of impact on the lifting mechanism, the positive cavity pressure of the lifting hydraulic cylinder increases sharply to push the piston to move left, so that the lifting mechanism actively descends a certain distance, so that the lifting mechanism slowly and smoothly transitions to a stable state after the load is lowered, thereby preventing the lifting mechanism from rebounding and swinging up and down to damage the mechanical structure.

[0017] The buffer device of the present invention and the hydraulic buffer lifting device capable of adapting to impact loads will be further described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the buffer device of the present invention when the lifting hydraulic cylinder is unloaded;

[0019] Figure 2 It is a structural schematic diagram of the buffer device of the present invention when the lifting hydraulic cylinder is fully loaded;

[0020] Figure 3It is a hydraulic principle diagram of the hydraulic buffer lifting device that can adapt to impact loads of the present invention;

[0021] Figure 4 It is a schematic diagram of the working state structure of the hydraulic buffer lifting device that can adapt to impact loads of the present invention. DETAILED DESCRIPTION

[0022] like Figure 1 , Figure 2 , Figure 3 As shown, a buffer device of the present invention comprises a first end cover 01, a second end cover 02, a shell 03, an air charging port 04, a liquid inlet 05, and a piston 06. The shell 03 is tubular, and the first end cover 01, the second end cover 02, and the piston 06 are all arranged in the inner cavity of the shell 03. The outer wall of the first end cover 01, the outer wall of the second end cover 02, the outer wall of the piston 06 and the inner wall of the shell 03 are sealed with each other. The first end cover 01 and the second end cover 02 are respectively located at the two ends of the shell 03, and the piston 06 is located between the first end cover 01 and the second end cover 02. An air cavity is formed between the piston 06 and the first end cover 01, and a liquid cavity is formed between the piston 06 and the second end cover 02. The piston 06 is suitable for When moving toward the two ends of the shell 03, the inflation port 04 is arranged on the first end cover 01, and the inflation port 04 is used to connect the air source, and the air source is an inert gas. The liquid inlet 05 is arranged on the second end cover 02, and the liquid inlet 05 is used to connect the positive cavity liquid circuit 71 of the lifting hydraulic cylinder 07. A certain pressure of inert gas is pre-filled into the air cavity through the inflation port 04, and the pre-filled pressure of the gas in the air cavity matches the lifting hydraulic cylinder 07. When the volume of the air cavity is the largest, the gas pressure in the air cavity is P1, and when the volume of the air cavity is the smallest, the gas pressure in the air cavity is P2. P1 is greater than the positive cavity pressure when the lifting hydraulic cylinder 07 is unloaded, and P2 is less than the positive cavity pressure when the lifting hydraulic cylinder 07 is fully loaded. When the buffer device of the present invention is used, the liquid inlet 05 is connected to the positive cavity liquid circuit 71 of the lifting hydraulic cylinder 07, and the piston rod 72 of the lifting hydraulic cylinder 07 is connected to the lifting mechanism 08. The lifting mechanism 08 is used to lift the load 09, such as Figure 3 , Figure 4As shown, when the lifting mechanism 08 is unloaded, the gas pressure in the air cavity is greater than the positive cavity pressure of the lifting hydraulic cylinder 07, and the piston 06 is pushed to the rightmost end by the gas. When the load 09 is lowered from the original clamping mechanism to the lifting mechanism 08, the load 09 generates an impact load on the lifting mechanism 08 at the moment of release. At this time, the positive cavity pressure of the lifting hydraulic cylinder 07 increases sharply, and the positive cavity liquid of the lifting hydraulic cylinder 07 enters the liquid cavity through the liquid inlet 05 to push the piston 06 to the left until the gas volume in the air cavity is compressed to the minimum, the piston 06 stops moving, and the positive cavity pressure of the lifting hydraulic cylinder 07 steadily returns to the pressure when fully loaded; when the load 09 on the lifting mechanism 08 is transferred, the positive cavity pressure of the lifting hydraulic cylinder 07 decreases, and the gas in the air cavity expands to push the piston 06 to the right, preparing for the next load acceptance. A buffer device of the present invention is provided in a shell 03, wherein a first end cover 01, a second end cover 02 and a piston 06 are arranged, an air cavity is formed between the piston 06 and the first end cover 01, a liquid cavity is formed between the piston 06 and the second end cover 02, an air filling port 04 is used to connect an air source, and a liquid inlet port 05 is used to connect a positive cavity liquid circuit 71 of a lifting hydraulic cylinder 07. Therefore, when a lifting mechanism 08 bears a load 09 and the load 09 is released at the moment of impacting the lifting mechanism 08, the positive cavity pressure of the lifting hydraulic cylinder 07 increases sharply to push the piston 06 to move left, causing the lifting mechanism 08 to actively descend a certain distance, so that the lifting mechanism 08 can slowly and smoothly transition to a stable state after the load is lowered, thereby preventing the lifting mechanism 08 from rebounding and swinging up and down to damage the mechanical structure.

[0023] Optionally, it also includes a liquid inlet connector 51 and a buffer damper 52. The buffer damper 52 is provided with an axial center hole. The buffer damper 52 is provided in the liquid inlet connector 51. The liquid inlet connector 51 is provided in the liquid inlet 05. When in use, it is connected to the positive cavity liquid circuit 71 of the lifting hydraulic cylinder 07 through the liquid inlet connector 51. The flow rate of the liquid flowing from the positive cavity of the lifting hydraulic cylinder 07 into the liquid cavity is adjusted by adjusting the damping size of the buffer damper 52, thereby adjusting the descending speed of the lifting mechanism 08, so that the lifting mechanism 08 can transition to a stable state more smoothly. Specifically, the buffer damper 52 is modified from a standard screw. A series of screws with different apertures can be obtained by drilling a hole in the axial center of the screw. The damping force can be adjusted by replacing the buffer damper 52 with different apertures.

[0024] Optionally, the damping force of the buffer damper 52 is adjustable.

[0025] Optionally, the buffer damper 52 is threadedly connected to the liquid inlet connector 51, and the damping force can be adjusted by replacing the buffer damper 52 with different apertures, which is more convenient to operate.

[0026] Optionally, the liquid inlet connector 51 is threadedly connected to the liquid inlet 05, which is convenient and quick to install.

[0027] Optionally, it also includes an inflation port blocking cover 41, which is threadedly connected to the inflation port 04. In a non-inflated state, the inflation port blocking cover 41 is threadedly connected to the inflation port 04 to prevent debris from entering the inflation port 04.

[0028] Optionally, a first groove 11 is provided on the end surface of the first end cover 01 close to the piston 06, and a second groove 61 is provided on the end surface of the piston 06 close to the first end cover 01. The first groove 11 and the second groove 61 are used to store gas. The provision of the first groove 11 and the second groove 61 can effectively control the minimum value of the gas volume, thereby controlling the maximum pressure value.

[0029] Optionally, a protrusion 62 is provided on the end surface of the piston 06 close to the second end cover 02, and a third groove 21 is provided on the end surface of the second end cover 02 close to the piston 06, and the protrusion 62 matches the third groove 21. When the piston 06 moves to the left, the protrusion 62 and the third groove 21 play a role of slow start, and the force area of ​​the piston 06 changes from small to large, and the force also changes.

[0030] Optionally, a plurality of sealing rings are respectively arranged between the first end cover 01 and the housing 03 , between the second end cover 02 and the housing 03 , and between the piston 06 and the housing 03 .

[0031] The present invention provides a hydraulic buffer lifting device that can adapt to impact loads, such as Figure 3 , Figure 4 As shown, it includes a lifting hydraulic cylinder 07, a lifting mechanism 08 and the above-mentioned buffer device, the liquid inlet 05 is connected to the positive cavity liquid circuit 71 of the lifting hydraulic cylinder 07, the piston rod 72 of the lifting hydraulic cylinder 07 is connected to the lifting mechanism 08, the lifting mechanism 08 is used to lift the load 09, and a locking element 74 is arranged between the positive cavity liquid circuit 71 and the negative cavity liquid circuit 73 of the lifting hydraulic cylinder 07.

[0032] The embodiments described above are merely descriptions of preferred implementation modes of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A buffer device, characterized in that: The invention comprises a first end cover (01), a second end cover (02), a shell (03), an air charging port (04), a liquid inlet (05), and a piston (06); the shell (03) is tubular; the first end cover (01), the second end cover (02), and the piston (06) are all arranged in the inner cavity of the shell (03); the outer wall of the first end cover (01), the outer wall of the second end cover (02), the outer wall of the piston (06), and the inner wall of the shell (03) are sealed with each other; the first end cover (01) and the second end cover (02) are respectively located at two ends of the shell (03); the piston (06) is located between the first end cover (01) and the second end cover (02); the piston (06) and the first end cover (01) are connected to each other. An air cavity is formed between the piston (06) and the second end cover (02), and a liquid cavity is formed between the piston (06) and the second end cover (02). The piston (06) is suitable for moving toward the two ends of the shell (03). The inflation port (04) is arranged on the first end cover (01), and the inflation port (04) is used to connect the air source. The liquid inlet (05) is arranged on the second end cover (02), and the liquid inlet (05) is used to connect the positive cavity liquid circuit (71) of the lifting hydraulic cylinder (07). When the volume of the air cavity is maximum, the gas pressure in the air cavity is P1, and when the volume of the air cavity is minimum, the gas pressure in the air cavity is P2, P1 is greater than the positive cavity pressure of the lifting hydraulic cylinder (07) when it is unloaded, and P2 is less than the positive cavity pressure of the lifting hydraulic cylinder (07) when it is fully loaded.

2. The buffer device according to claim 1, characterized in that: It also includes a liquid inlet joint (51) and a buffer damper (52), wherein the buffer damper (52) is provided with an axial center hole, the buffer damper (52) is arranged in the liquid inlet joint (51), and the liquid inlet joint (51) is arranged in the liquid inlet (05).

3. The buffer device according to claim 2, characterized in that: The damping force of the buffer damper (52) is adjustable.

4. The buffer device according to claim 3, characterized in that: The buffer damper (52) is threadedly connected to the liquid inlet connector (51), and the damping force can be adjusted by replacing the buffer damper (52) with different apertures.

5. The buffer device according to claim 4, characterized in that: The liquid inlet connector (51) is threadedly connected to the liquid inlet (05).

6. The buffer device according to claim 1, characterized in that: It also comprises an inflation port blocking cover (41), wherein the inflation port blocking cover (41) is threadedly connected to the inflation port (04).

7. The buffer device according to claim 1, characterized in that: A first groove (11) is provided on an end surface of the first end cover (01) close to the piston (06), and a second groove (61) is provided on an end surface of the piston (06) close to the first end cover (01).

8. The buffer device according to claim 1, characterized in that: A protrusion (62) is arranged on the end surface of the piston (06) close to the second end cover (02), and a third groove (21) is arranged on the end surface of the second end cover (02) close to the piston (06), and the protrusion (62) matches the third groove (21).

9. The buffer device according to claim 1, characterized in that: Sealing rings are respectively arranged between the first end cover (01) and the housing (03), between the second end cover (02) and the housing (03), and between the piston (06) and the housing (03).

10. A hydraulic buffer lifting device capable of adapting to impact loads, characterized in that: It comprises a lifting hydraulic cylinder (07), a lifting mechanism (08) and a buffer device as described in any one of claims 1 to 9, wherein the liquid inlet (05) is connected to the positive cavity liquid circuit (71) of the lifting hydraulic cylinder (07), and the piston rod of the lifting hydraulic cylinder (07) is connected to the lifting mechanism (08).

Images