Direct connection type shaft penetrating device

Abstract

This invention relates to a direct-drive shaft coupling, comprising a motor and a plunger pump connected to the motor, and further comprising: a cylinder seat, an outer cylinder body mounted on the cylinder seat, an inner cylinder body, and a central tube. Both the plunger pump and the motor are mounted on the cylinder seat. The inner cylinder body is located inside the outer cylinder body, and the cavity between them forms an oil reservoir, which communicates with the plunger pump's oil supply port. A piston rod is slidably mounted within the inner cylinder body, and the piston rod has a retraction cavity communicating with the inner cylinder body. The central tube is movably inserted inside the piston rod and also communicates with the retraction cavity. A cylinder head is mounted at the other end of the outer and inner cylinder bodies and movably inserted onto the piston rod. A valve device is mounted on the cylinder seat and communicates with the oil reservoir, the central tube, the inner cylinder body, and the plunger pump, respectively, for controlling the extension and retraction of the piston rod. This shaft coupling has a compact structure, small overall size, light weight, and is very convenient to use. Furthermore, the integrated structure greatly reduces pressure drop.

Description

Technical Field

[0001] This invention relates to a shaft threader, and more particularly to a direct-connection shaft threader. Background Technology

[0002] Tower cranes and some heavy-duty crawler cranes are installed on-site during use, and are connected by pins. Since inserting the pins requires a lot of force, hammering can easily damage them. Therefore, hydraulic pumps and hydraulic cylinders are usually used to install and remove the pins. However, conventional hydraulic pump stations can only be set up on the ground. Therefore, when assembling the pins, long pipelines are required. Long pipelines result in significant pressure drop and are inconvenient to use. Summary of the Invention

[0003] To address the issues of high pressure drop and inconvenience in hydraulic assembly, this invention provides a direct-connection shaft coupling, the specific technical solution of which is as follows:

[0004] A direct-drive shaft coupling includes a motor and a plunger pump connected to the motor, and further includes: a cylinder seat, on which both the plunger pump and the motor are mounted; an outer cylinder body, one end of which is fixed to the cylinder seat; an inner cylinder body, one end of which is fixed to the cylinder seat and located inside the outer cylinder body, the cavity between the inner and outer cylinder bodies forming an oil reservoir, the oil reservoir communicating with the oil replenishment chamber of the plunger pump; and a piston rod, which is slidably mounted within the inner cylinder body. The piston rod has a retraction chamber communicating with the inner cylinder; a central tube fixed to the cylinder seat and movably inserted into the piston rod, the central tube also communicating with the retraction chamber; a cylinder head installed at the other end of the outer cylinder and the inner cylinder and movably inserted into the piston rod; and a valve device installed on the cylinder seat and communicating with the oil reservoir, the central tube, the inner cylinder and the plunger pump, respectively, for controlling the extension and retraction of the piston rod.

[0005] Preferably, it further includes: closed-cell foam, which is installed inside the oil storage cavity.

[0006] Furthermore, it also includes: a fixing ring, which is fixed on the inner cylinder and located on one side of the closed-cell foam.

[0007] Preferably, the valve device includes: a replenishing check valve, which is installed between the fourth and sixth oil passages of the cylinder seat, the fourth oil passage being connected to the oil reservoir and the replenishing port of the plunger pump respectively; and a drain check valve, which is installed between the third, second, and eighth oil passages of the cylinder seat, the third oil passage being connected to the drain check valve and the A-chamber oil port of the plunger pump respectively.

[0008] Furthermore, the valve device further includes: an extended relief valve, which is installed between the first oil passage and the seventh oil passage of the cylinder seat, and the seventh oil passage is connected to the oil reservoir, and the first oil passage is connected to the rodless chamber of the inner cylinder and the A-port of the plunger pump; and a retractable relief valve, which is installed between the second oil passage and the eighth oil passage of the cylinder seat, and the eighth oil passage is connected to the oil reservoir, and the second oil passage is connected to the drain check valve and the B-port of the plunger pump.

[0009] The drain check valve is a hydraulically controlled check valve.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] The present invention provides a direct-connect shaft coupling that integrates a hydraulic station and a hydraulic cylinder into one unit. It has a compact structure, small overall size, and light weight, making it particularly suitable for occasions where there is limited installation space and it is impossible to install an external hydraulic station. It is very convenient to use, and the integrated structure greatly reduces pressure drop. Attached Figure Description

[0012] Figure 1 It is a cross-sectional view along the first and third oil passages;

[0013] Figure 2 This is a partial cross-sectional view along the fourth and sixth oil passages;

[0014] Figure 3 This is a schematic diagram of the hydraulic oil flow when the piston rod extends;

[0015] Figure 4 This is a schematic diagram of the hydraulic oil flow when the piston rod retracts. Detailed Implementation

[0016] The present invention will now be further described with reference to the accompanying drawings.

[0017] like Figures 1 to 4As shown, a direct-drive shaft coupling includes a motor 22, a plunger pump 21, a cylinder seat 1, an outer cylinder body 3, an inner cylinder body 4, a piston rod 5, a center tube 6, a cylinder head 7, and a valve assembly. The plunger pump 21 is a cartridge type, installed in the plunger hole 15 of the cylinder seat 1. The motor 22 is mounted on the cylinder seat 1 and connected to the plunger pump 21. The cylinder seat 1 also has a first oil passage 11, a second oil passage 12, a third oil passage 13, a fourth oil passage 14, a connecting hole 16, a seventh oil passage 17, and an eighth oil passage 18. Both the outer cylinder 3 and the inner cylinder 4 are fixed on the cylinder seat 1 and are coaxially arranged. The inner cylinder 4 is also located inside the outer cylinder 3. The cavity between the inner cylinder 4 and the outer cylinder 3 forms an oil storage chamber 41, which is connected to the oil replenishment chamber of the plunger pump 21 through the fourth oil passage 14. One end of the piston rod 5 is provided with a piston ring 51, which is slidably installed inside the inner cylinder 4. The center of the piston rod 5 is provided with a blind hole, which forms a retraction chamber 52. The outer surface of the piston rod 5 is provided with a retraction hole 53, which is connected to both the retraction chamber 52 and the inner cylinder 4. The central tube 6 is fixed on the cylinder seat 1 and is movably inserted inside the piston rod 5. The central tube 6 is also connected to the retraction chamber 52. The bottom of the central tube 6 is provided with a lower through hole 61, which is connected to the connecting hole 16 at the top of the plunger hole 15. The connecting hole 16 is also connected to the second oil passage 12. The cylinder head 7 is installed at the other end of the outer cylinder block 3 and the inner cylinder block 4, and is movably inserted into the piston rod 5. The first oil passage 11 is connected to the inner cylinder block 4 and the A-port of the plunger pump 21 respectively; the second oil passage 12 is connected to the center pipe 6 and the B-port of the plunger pump 21 respectively; the third oil passage 13 is connected to the drain check valve 24 and the A-port of the plunger pump 211 respectively; and the fourth oil passage 14 is connected to the oil replenishment port of the plunger pump 21 and the oil reservoir 41 respectively. The valve assembly includes a replenishing check valve 25, a drain check valve 24, an extension relief valve 23, and a retracting relief valve 26. The replenishing check valve 25 is installed between the fourth oil passage 14 and the connecting hole 16 of the cylinder seat 1; the drain check valve 24 is installed between the third oil passage 13, the second oil passage 12, and the eighth oil passage 18 of the cylinder seat 1; the extension relief valve 23 is installed between the first oil passage 11 and the seventh oil passage 17 of the cylinder seat 1, with the seventh oil passage 17 communicating with the oil reservoir 41; and the retracting relief valve 26 is installed between the second oil passage 12 and the eighth oil passage 18 of the cylinder seat 1, with the eighth oil passage 18 communicating with the oil reservoir 41. The valve assembly is used to control the extension and retraction of the piston rod 5. The drain check valve 24 is a hydraulically controlled check valve.

[0018] The oil storage chamber 41 is equipped with closed-cell foam 81 and a fixing ring 82. The fixing ring 82 is fixed to the inner cylinder 4 and located on one side of the closed-cell foam 81. The fixing ring 82 has several oil passage holes. The fixing ring 82 fixes the foam.

[0019] like Figure 3As shown, when the piston rod 5 of the inner cylinder 4 extends, the motor 22 rotates forward, and the A-chamber port of the plunger pump 21 outputs pressurized oil. The hydraulic oil enters the rodless chamber of the inner cylinder 4 through the first oil passage 11, pushing the piston rings to move towards the cylinder head 7, thus extending the piston rod 5. The hydraulic oil discharged from the rod chamber of the inner cylinder 4 enters the retraction chamber 52 of the piston rod 5 through the retraction hole 53, and then enters the B-chamber port of the plunger pump 21 through the central tube 6 and the connecting hole 16. At the same time, the hydraulic oil in the oil reservoir 41 enters the B-chamber port of the plunger pump 21 through the fourth oil passage 14 and the replenishing check valve 25 to compensate for insufficient oil intake at the B-chamber port of the plunger pump 21. The extended relief valve 23 controls the pressure of the first oil passage 11. If the pressure is too high, it is depressurized, and the depressurized hydraulic oil flows back to the oil reservoir 41 through the seventh oil passage 17.

[0020] like Figure 4 As shown, when the piston rod 5 of the inner cylinder 4 retracts, the motor 22 reverses, and the B-chamber port of the plunger pump 21 outputs pressurized oil. The hydraulic oil is sent into the central tube 6 through the connecting hole 16, and then enters the retraction chamber 52 of the piston rod 5 through the central tube 6. It then enters the rod chamber of the inner cylinder 4 through the retraction hole 53, pushing the piston ring to move towards the cylinder seat 1, thus retracting the piston rod 5. The hydraulic oil discharged from the rodless chamber of the inner cylinder 4 enters the A-chamber port of the plunger pump 21 through the first oil passage 11. At the same time, the excess hydraulic oil discharged from the rodless chamber of the inner cylinder 4 returns to the oil storage chamber 41 through the third oil passage 13, the drain check valve 24, and the eighth oil passage 18. The retraction relief valve 26 controls the pressure of the second oil passage 12. If the pressure is too high, it releases the pressure, and the released hydraulic oil flows back to the oil storage chamber 41 through the eighth oil passage 18.

[0021] By integrating the hydraulic station and hydraulic cylinder together, miniaturization and weight reduction are achieved, with an overall weight of about 8 kilograms. This allows for easy disassembly and assembly of the tower crane's pins, improving safety, ease of use, and reducing labor intensity.

[0022] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of the invention and should not be construed as limiting the scope of protection of the invention in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of the invention without inventive effort, and these embodiments will all fall within the scope of protection of the claims of the present invention.

Claims

1. A direct-drive shaft coupling, comprising a motor (22) and a plunger pump (21) connected to said motor (22), characterized in that, Also includes: The cylinder seat (1) is on which the plunger pump (21) and the motor (22) are both mounted; Outer cylinder body (3), one end of which is fixed to the cylinder seat (1); The inner cylinder (4) has one end fixed on the cylinder seat (1) and located inside the outer cylinder (3). The cavity between the inner cylinder (4) and the outer cylinder (3) forms an oil storage chamber (41), which is connected to the oil replenishment chamber of the plunger pump (21). Piston rod (5), the piston rod (5) is slidably installed in the inner cylinder (4), and the piston rod (5) has a retraction cavity (52) communicating with the inner cylinder (4). The central tube (6) is fixed on the cylinder seat (1) and is movably inserted inside the piston rod (5). The central tube (6) is also connected to the retraction cavity (52). Cylinder head (7), which is mounted on the other end of the outer cylinder body (3) and the inner cylinder body (4) and is movably inserted into the piston rod (5); and A valve device is installed on the cylinder seat (1) and is connected to the oil reservoir (41), the central tube (6), the inner cylinder (4) and the plunger pump (21) respectively, for controlling the extension and retraction of the piston rod (5); The valve device includes: A replenishing check valve (25) is installed between the fourth oil passage (14) and the connecting hole (16) of the cylinder seat (1). The fourth oil passage (14) is connected to the oil reservoir (41) and the replenishing port of the plunger pump (21), respectively. Oil drain check valve (24) is installed between the third oil passage (13), the second oil passage (12) and the eighth oil passage (18) of the cylinder seat (1). The third oil passage (13) is connected to the oil drain check valve (24) and the A-chamber oil port of the plunger pump (21). The valve device further includes: An extension relief valve (23) is installed between the first oil passage (11) and the seventh oil passage (17) of the cylinder seat (1), and the seventh oil passage (17) is connected to the oil reservoir (41). The first oil passage (11) is connected to the rodless chamber of the inner cylinder (4) and the A-port of the plunger pump (21), respectively. The retractable relief valve (26) is installed between the second oil passage (12) and the eighth oil passage (18) of the cylinder seat (1), and the eighth oil passage (18) is connected to the oil storage chamber (41). The second oil passage (12) is connected to the drain check valve (24) and the B-port of the plunger pump (21).

2. The direct-connection shaft connector according to claim 1, characterized in that, Also includes: Closed-cell foam (81) is installed inside the oil storage cavity (41).

3. A direct-connection shaft connector according to claim 2, characterized in that, Also includes: A fixed retaining ring (82) is fixed on the inner cylinder (4) and located on one side of the closed-cell foam (81).

4. A direct-connection shaft connector according to claim 1, characterized in that, The drain check valve (24) is a hydraulically controlled check valve.

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