Hydraulic spindle with built-in check valve

Abstract

The utility model discloses a hydraulic main shaft internally provided with a check valve. The hydraulic main shaft comprises a shaft core, an outer sleeve piece, a front end flange and an oil cylinder valve body, wherein the shaft core is sleeved with the outer sleeve piece, the front end flange is arranged at one end of the outer sleeve piece, and the oil cylinder valve body is located between the shaft core and the outer sleeve piece. A piston is arranged between the front end flange and the shaft core, a containing cavity is formed in the front end flange, the piston is located in the containing cavity, and the containing cavity is divided into an oil inlet cavity and an oil return cavity based on the piston; a first check valve and a second check valve are arranged between the shaft core and the piston, the first check valve is connected with the oil inlet cavity, and the second check valve is connected with the oil return cavity. The two check valves are arranged in the hydraulic main shaft, so that the self-locking function of hydraulic pressure in the hydraulic main shaft is achieved, and the reliability of the hydraulic main shaft for clamping a work piece is improved.

Description

Technical Field

[0001] The utility model mainly relates to the technical field of machine tool equipment, in particular to a hydraulic main shaft with a built-in check valve. Background Art

[0002] The hydraulic spindle clamps and releases the workpiece through a hydraulic cylinder system installed inside the hydraulic spindle. When the hydraulic spindle loses power or the hydraulic source fails, causing a hydraulic oil supply cutoff, the clamping pressure of the hydraulic spindle will drop rapidly, resulting in insufficient clamping force of the hydraulic spindle on the workpiece, affecting the reliability of the hydraulic spindle in clamping the workpiece. Utility Model Content

[0003] The purpose of the utility model is to overcome the deficiencies of the prior art. The utility model provides a hydraulic spindle with a built-in check valve. By arranging two check valves in the hydraulic spindle, the self-locking function of the hydraulic pressure inside the hydraulic spindle is realized, thereby improving the reliability of the hydraulic spindle in clamping the workpiece.

[0004] The utility model provides a hydraulic main shaft with a check valve inside, the hydraulic main shaft comprises a shaft core, an outer sleeve sleeved outside the shaft core, a front end flange arranged at one end of the outer sleeve, and a cylinder valve body located between the shaft core and the outer sleeve;

[0005] A piston is arranged between the front end flange and the shaft core, a receiving chamber is arranged in the front end flange, the piston is located in the receiving chamber, and the receiving chamber is divided into an oil inlet chamber and an oil return chamber based on the piston;

[0006] A first check valve and a second check valve are provided between the shaft core and the piston. The first check valve is connected to the oil inlet chamber, and the second check valve is connected to the oil return chamber.

[0007] Further, the first check valve comprises a first valve body, a first valve core and a first valve cover;

[0008] The first valve core is inserted into the first valve body, and the first valve cover is fitted on one end of the first valve body.

[0009] Furthermore, a spring is disposed in the first valve body, one end of the spring is located on the other end of the first valve body, and the other end of the spring is connected to the first valve core.

[0010] Furthermore, the first valve cover is a sealed cover body.

[0011] Furthermore, the second check valve comprises a second valve body, a second valve core and a second valve cover;

[0012] The second valve core is inserted into the second valve body, and the second valve cover is fitted on one end of the second valve body.

[0013] Furthermore, a spring is disposed in the second valve body, one end of the spring is located on the other end of the second valve body, and the other end of the spring is connected to the second valve core.

[0014] Furthermore, a middle through hole is provided on the second valve cover.

[0015] Furthermore, a one-way oil circuit is formed between the first check valve and the second check valve.

[0016] The utility model provides a hydraulic spindle with a built-in check valve. By arranging two check valves in the hydraulic spindle, the flow direction of the hydraulic oil in the hydraulic spindle is controlled based on the check valves, thereby realizing the self-locking function of the internal hydraulic pressure of the hydraulic spindle. When the hydraulic source fails or the hydraulic spindle is damaged, the internal pressure of the hydraulic spindle can be ensured to be stable, thereby improving the reliability of the hydraulic spindle in clamping the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the hydraulic spindle structure of an embodiment of the utility model;

[0018] Figure 2 It is attached in the embodiment of the utility model Figure 1 A magnified view of the structure at a;

[0019] Figure 3 It is a structural schematic diagram of the first check valve in the embodiment of the utility model;

[0020] Figure 4 It is a structural schematic diagram of the second check valve in the embodiment of the utility model. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] Figure 1 A schematic diagram showing the hydraulic spindle structure of an embodiment of the utility model is shown. Figure 2 The utility model embodiment is shown in the attached Figure 1 A magnified view of the structure at a; Figure 3 It shows a schematic structural diagram of the first check valve 6 in the embodiment of the utility model; Figure 4A schematic structural diagram of the second check valve 7 in an embodiment of the utility model is shown, wherein the hydraulic spindle includes a shaft core 2, an outer sleeve 1 sleeved outside the shaft core 2, a front end flange 5 arranged at one end of the outer sleeve 1, and a cylinder valve body 3 located between the shaft core 2 and the outer sleeve 1.

[0023] A piston 4 is arranged between the front end flange 5 and the shaft core 2, and an accommodating chamber is arranged in the front end flange 5. The piston 4 is located in the accommodating chamber, and the accommodating chamber is divided into an oil inlet chamber and an oil return chamber based on the piston 4. An oil inlet path and an oil return path are arranged in the outer sleeve 1, and the cylinder valve body 3 cooperates with the oil inlet path and the oil return path to form a rotary cylinder structure in the hydraulic main shaft. The flow of hydraulic oil inside the hydraulic main shaft is realized based on the rotary cylinder structure, and the piston 4 is driven to reciprocate based on the hydraulic oil.

[0024] The front end of the hydraulic spindle is used to connect to the clamping mechanism, and the hydraulic spindle can drive the clamping mechanism to clamp the workpiece or the tool, and the hydraulic spindle can also drive the clamping mechanism to release the workpiece or the tool; the rear end of the hydraulic spindle is used to connect to the driving component, and the driving component can drive the shaft core 2 of the hydraulic spindle to rotate, thereby driving the clamping mechanism to achieve clamping and release.

[0025] Specifically, a first check valve 6 and a second check valve 7 are provided between the shaft core 2 and the piston 4. The first check valve 6 is connected to the oil inlet chamber, and the second check valve 7 is connected to the oil return chamber. The first check valve 6 includes a first valve body 63, a first valve core 61 and a first valve cover 64. The first valve core 61 is inserted into the first valve body 63, and the first valve cover 64 is fitted on one end of the first valve body 63.

[0026] An oil inlet passage is provided in the front end flange 5, and a connecting hole is provided on the side wall of the first valve body 63. One end of the oil inlet passage is connected to the connecting hole, and the other end of the oil inlet passage is connected to the oil inlet chamber. After passing through the first check valve 6, the hydraulic oil can be input into the oil inlet chamber along the oil inlet passage.

[0027] Specifically, a first spring 62 is provided in the first valve body 63, one end of the first spring 62 is located on the other end of the first valve body 63, and the other end of the spring is connected to the first valve core 61. The first valve core 61 is inserted in the first valve body 63, and the first valve core 61 is against the position of the connecting hole, so that the connecting hole is in a closed state. When the hydraulic oil enters the first valve body 63, the first valve core 61 moves in the direction of the first spring 62 under the pressure of the hydraulic oil, the first spring 62 contracts, the first valve core 61 and the connecting hole are relatively displaced, and the connecting hole is in an open state, so that the hydraulic oil can enter the oil inlet channel through the connecting hole and fill the oil inlet chamber to drive the piston 4 to move.

[0028] The first valve cover 64 is a sealed cover structure to prevent oil leakage when hydraulic oil enters the first check valve 6 .

[0029] Specifically, the second check valve 7 includes a second valve body 73, a second valve core 71 and a second valve cover 74; the second valve core 71 is inserted into the second valve body 73, the second valve cover 74 cooperates with one end of the second valve body 73, a second spring 72 is arranged in the second valve body 73, one end of the second spring 72 is located at the other end of the second valve body 73, the other end of the spring is connected to the second valve core 71, a middle through hole is arranged on the second valve cover 74, and the second check valve 7 is connected to the oil return chamber based on the middle through hole. After the hydraulic oil enters the second check valve 7, the second valve core 71 can drive the second spring 72 to undergo elastic deformation based on the extrusion of the hydraulic oil, so that the second valve core 71 moves in the second valve body 73, and the oil circuit is connected.

[0030] Furthermore, the first valve core 61 is inserted into the first valve body 63, and based on the action of the first spring 62, the first valve body 63 is in a closed state, and the second valve core 71 is inserted into the second valve body 73, and based on the action of the second spring 72, the second valve body 73 is in a closed state. When the hydraulic spindle works normally, the first check valve 6 and the second check valve 7 can meet the hydraulic oil transportation requirements based on the action of the hydraulic oil, and realize the one-way delivery control of the hydraulic oil based on the first spring 62, the first valve core 61, the second spring 72 and the second valve core 71.

[0031] Specifically, a one-way oil circuit is formed between the first check valve 6 and the second check valve 7, that is, the hydraulic oil inside the hydraulic spindle enters the oil inlet chamber from the first check valve 6, and returns to the external hydraulic station from the oil return chamber based on the second check valve 7. When the hydraulic system of the hydraulic spindle fails, the first check valve 6 and the second check valve 7 can block the hydraulic oil in the oil inlet chamber and the oil return chamber from reverse flow, ensuring that the position pressure of the piston 4 in the hydraulic spindle is maintained, avoiding the situation where the pressure of the hydraulic spindle gradually drops, resulting in a decrease in the clamping force of the hydraulic spindle, thereby ensuring the clamping stability of the hydraulic spindle on the workpiece.

[0032] The embodiment of the utility model provides a hydraulic spindle with an attached check valve. By arranging two check valves in the hydraulic spindle, the flow direction of the hydraulic oil in the hydraulic spindle is controlled based on the check valves, thereby realizing the self-locking function of the internal hydraulic pressure of the hydraulic spindle. When the hydraulic source fails or the hydraulic spindle is damaged, the internal pressure of the hydraulic spindle can be ensured to be stable, thereby improving the reliability of the hydraulic spindle in clamping the workpiece.

[0033] In addition, the above provides a detailed introduction to the embodiments of the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A hydraulic spindle with a built-in check valve, characterized in that: The hydraulic main shaft comprises a shaft core, an outer sleeve sleeved outside the shaft core, a front end flange arranged at one end of the outer sleeve, and a cylinder valve body located between the shaft core and the outer sleeve; A piston is arranged between the front end flange and the shaft core, a receiving chamber is arranged in the front end flange, the piston is located in the receiving chamber, and the receiving chamber is divided into an oil inlet chamber and an oil return chamber based on the piston; A first check valve and a second check valve are provided between the shaft core and the piston. The first check valve is connected to the oil inlet chamber, and the second check valve is connected to the oil return chamber.

2. The hydraulic spindle with a built-in check valve according to claim 1, characterized in that: The first check valve comprises a first valve body, a first valve core and a first valve cover; The first valve core is inserted into the first valve body, and the first valve cover is fitted on one end of the first valve body.

3. The hydraulic spindle with a built-in check valve according to claim 2, characterized in that: A spring is disposed in the first valve body, one end of the spring is located on the other end of the first valve body, and the other end of the spring is connected to the first valve core.

4. The hydraulic spindle with a built-in check valve according to claim 2, characterized in that: The first valve cover is a sealed cover.

5. The hydraulic spindle with a built-in check valve according to claim 1, characterized in that: The second check valve comprises a second valve body, a second valve core and a second valve cover; The second valve core is inserted into the second valve body, and the second valve cover is fitted on one end of the second valve body.

6. The hydraulic spindle with a built-in check valve according to claim 5, characterized in that: A spring is disposed in the second valve body, one end of the spring is located on the other end of the second valve body, and the other end of the spring is connected to the second valve core.

7. The hydraulic spindle with a built-in check valve according to claim 5, characterized in that: The second valve cover is provided with a middle through hole.

8. The hydraulic spindle with a built-in check valve according to claim 1, characterized in that: A one-way oil circuit is formed between the first check valve and the second check valve.

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