Main shaft hydraulic cylinder

Abstract

The utility model provides a spindle hydraulic cylinder, which relates to the technical field of spindle systems and comprises a cylinder body and a cylinder cover mounted on the cylinder body, a piston moving along the axis direction is mounted in the cylinder body and the cylinder cover, a sensing ring moving along with the piston is fixedly connected to the end, close to the cylinder cover, of the piston, and communicated air guide channels are formed in the piston and the sensing ring. An air pipe connector is installed on the outer side of the outer end mouth measuring ring of the air guide channel, positioning holes are formed in the corresponding ends of the piston and the cylinder cover at the same time, a positioning pin is installed in the positioning hole in the piston end, and the positioning pin is matched with the positioning hole in the cylinder cover end. According to the hydraulic cylinder, the air guide channel used for cutter loosening and air blowing is completely independent relative to the sealing structure of the piston, the risk that a sealing ring loses efficacy when a traditional spindle hydraulic cylinder loosens the cutter and blows air can be effectively avoided, and the service life of the hydraulic cylinder is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of spindle systems, in particular to a spindle hydraulic cylinder. Background Art

[0002] In machining, especially in CNC (computer numerical control) machine tools, the machine tool removes and replaces the tool through the spindle hydraulic cylinder in the hydraulic tool release system;

[0003] The traditional spindle hydraulic cylinder has a complex structure and low sealing performance. The oil seal is prone to failure during the knife loosening and air blowing process. The service life is short and the hydraulic cylinder needs to be replaced frequently. Therefore, we propose a spindle hydraulic cylinder. Utility Model Content

[0004] The purpose of the utility model is to solve the shortcomings existing in the prior art. The traditional spindle hydraulic cylinder has a complex structure and low sealing performance. The oil seal is prone to failure during the knife loosening and air blowing process. The service life is short and the hydraulic cylinder needs to be replaced frequently.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A spindle hydraulic cylinder comprises a cylinder body and a cylinder cover installed on the cylinder body, a piston moving along the axial direction is installed inside the cylinder body and the cylinder cover, a sensing ring moving with the piston is fixedly connected to the cylinder cover end, a piston seal is installed between the cylinder body, the cylinder cover and the piston, a groove is provided on the cylinder cover and a first sealing ring is provided between the piston, a groove is provided on the cylinder body and a second sealing ring is provided between the piston, a connected air guide channel is provided inside the piston and the sensing ring, an air pipe joint is installed on the outer side of the sensing ring at the outer port of the air guide channel, positioning holes are provided at the corresponding ends of the piston and the cylinder cover, a positioning pin is installed in the positioning hole at the piston end, and the positioning pin is adapted to the positioning hole at the cylinder cover end.

[0007] Furthermore, a first oil inlet and a second oil inlet are staggered up and down on the outer wall of the cylinder body adjacent to the cylinder head, and oil pipe joints are installed inside the first oil inlet and the second oil inlet.

[0008] Furthermore, the cylinder body, the cylinder head, the piston, the piston seal and the first sealing ring form a tool loosening hydraulic oil chamber, and the cylinder body, the piston, the piston seal and the second sealing ring form a tool pulling hydraulic oil chamber.

[0009] Furthermore, the piston seal includes O-rings and anti-wear rings. There are several groups of O-rings, which are arranged between the joint parts of the cylinder body and the cylinder head, between the fitting parts of the cylinder head and the piston, and between the fitting parts of the cylinder body and the piston. There are two groups of anti-wear rings, which are respectively arranged between the cylinder body and the cylinder head and the piston. The receiving grooves of the O-rings and the anti-wear rings are both opened on the cylinder body and the cylinder head.

[0010] Furthermore, the air guide channel includes a straight channel penetrating through the piston and a corner channel on the sensing ring. The corner channel and the straight channel are connected after the cylinder body and the cylinder cover are fixedly connected and are sealed by an O-ring.

[0011] Compared with the prior art, the utility model is further improved according to the shortcomings exposed during the use of the traditional machine tool spindle hydraulic cylinder, and the specific effects are:

[0012] 1) In the utility model, the air guide channel of the hydraulic cylinder used for loosening the knife and blowing air is completely independent of the sealing structure of the piston (i.e., the piston seal), which can effectively avoid the risk of sealing ring failure during the traditional spindle hydraulic cylinder loosening the knife and blowing air, and improve the service life of the hydraulic cylinder.

[0013] 2) In the utility model, positioning holes are provided at the corresponding ends of the piston and the cylinder head, and a positioning pin is provided on the piston to cooperate with the positioning hole provided in the cylinder head to ensure that the piston only moves along the axis during reciprocating motion, thereby solving the problem of rotation that may occur in the reciprocating motion of the piston, avoiding the risk of collision between the air pipe joint and the proximity switch bracket, and improving the reciprocating motion accuracy of the piston. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic side plan view of the overall structure of a spindle hydraulic cylinder provided by the utility model;

[0015] Figure 2 A side anatomical schematic diagram of the overall structure of a main shaft hydraulic cylinder provided by the utility model at a first angle;

[0016] Figure 3 A second-angle side anatomical schematic diagram of the overall structure of a spindle hydraulic cylinder provided by the utility model.

[0017] Legend:

[0018] 1. Cylinder body; 11. First oil inlet; 12. Second oil inlet; 13. Oil pipe joint;

[0019] 2. Cylinder head;

[0020] 3. Piston; 31. Sensing ring;

[0021] 4. Piston seal; 41. O-ring; 42. Anti-wear ring;

[0022] 5. The first sealing ring;

[0023] 6. Second sealing ring;

[0024] 7. air guide channel; 71. straight channel; 72. corner channel;

[0025] 8. Trachea connector;

[0026] 9. Positioning hole;

[0027] 10. Positioning pin. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0029] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant literature, and several embodiments of the present invention are given. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0030] It should be noted that when an element is referred to as being "fixed on" another element, it may be directly on the other element or there may also be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this article are for illustrative purposes only.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used in this article includes any and all combinations of one or more related listed items.

[0032] Example 1

[0033] like Figure 1-3As shown, the utility model provides a main shaft hydraulic cylinder: comprising a cylinder body 1 and a cylinder cover 2 installed on the cylinder body 1, a piston 3 moving along the axial direction is installed inside the cylinder body 1 and the cylinder cover 2, a sensing ring 31 moving with the piston 3 is fixedly connected to the end of the piston 3 near the cylinder cover 2, a piston seal 4 is installed between the cylinder body 1, the cylinder cover 2 and the piston 3, a groove body is provided on the cylinder cover 2 and a first sealing ring 5 is provided between the piston 3, a groove body is provided on the cylinder body 1 and a second sealing ring 6 is provided between the piston 3 and the piston 3, and a gas guide connected to each other is provided in the piston 3 and the sensing ring 31 Channel 7, an air pipe joint 8 is installed on the outside of the sensing ring 31 at the outer port of the air guide channel 7, and a positioning hole 9 is opened at the corresponding ends of the piston 3 and the cylinder head 2. A positioning pin 10 is installed in the positioning hole 9 at the end of the piston 3. The positioning pin 10 uses a threaded pin of specification M3×20, and the positioning pin 10 is adapted to the positioning hole 9 at the end of the cylinder head 2, ensuring that the piston 3 only moves along the axis during the reciprocating motion, solving the rotation problem of the piston 3 during the reciprocating motion, and avoiding the risk of collision between the air pipe joint 8 and the proximity switch bracket.

[0034] Example 2

[0035] like Figure 1-3 As shown, a first oil inlet 11 and a second oil inlet 12 are staggered up and down on the outer wall of the cylinder body 1 adjacent to the cylinder head 2 , and an oil pipe joint 13 is installed inside the first oil inlet 11 and the second oil inlet 12 .

[0036] The cylinder body 1, the cylinder head 2, the piston 3, the piston seal 4 and the first seal ring 5 form a tool loosening hydraulic oil chamber, and the cylinder body 1, the piston 3, the piston seal 4 and the second seal ring 6 form a tool broaching hydraulic oil chamber.

[0037] The piston seal 4 includes an O-ring 41 and an anti-wear ring 42. There are several groups of O-rings 41, which are arranged between the butt joints of the cylinder body 1 and the cylinder head 2, between the fitting parts of the cylinder head 2 and the piston 3, and between the fitting parts of the cylinder body 1 and the piston 3. There are two groups of anti-wear rings 42, which are arranged between the cylinder body 1 and the cylinder head 2 and the piston 3 respectively. The receiving grooves of the O-ring 41 and the anti-wear ring 42 are both opened on the cylinder body 1 and the cylinder head 2 to ensure the sealing effect in all directions.

[0038] The air guide channel 7 includes a straight channel 71 penetrating through the piston 3 and a corner channel 72 on the sensing ring 31, which ensures the connectivity of the channel and makes the overall structure more compact and reasonable. The corner channel 72 and the straight channel 71 are connected after the cylinder body 1 and the cylinder head 2 are fixed and sealed by the O-ring 41.

[0039] Working principle: hydraulic oil enters the tool loosening hydraulic oil chamber from the first oil inlet 11, the piston 3 moves to the left, driving the spindle tool pulling rod to move to the left, loosening the tool, and the hydraulic oil enters the tool loosening hydraulic oil chamber from the second oil inlet 12, the piston 3 moves to the right, driving the spindle tool pulling rod to move right, tightening the tool, completing the spindle tool loosening and broaching process. When loosening the tool, compressed air quickly flows into the air guide channel 7 through the air pipe joint 8, reaches the front end of the spindle tapered hole through the tool broaching system, and completes the spindle tool loosening and blowing process. When loosening the tool, the compressed air will not impact the sealing ring, effectively reducing the risk of sealing ring failure and extending the service life of the hydraulic cylinder.

[0040] The installation steps are as follows:

[0041] ① Apply appropriate lubricating grease to the first sealing ring 5, the second sealing ring 6, the O-ring 41 and the anti-wear ring 42, and then install them into the corresponding positions of the cylinder body 1, the cylinder head 2 and the piston 3 in sequence.

[0042] ② Fix the positioning pin 10 to the corresponding position of the end surface of the piston 3 rod. After the positioning pin 10 is aligned with the positioning hole 9 of the cylinder head 2, install the piston 3 rod into the cylinder head 2.

[0043] ③ Apply a proper amount of lubricating grease to the inner wall of the cylinder 1, press the piston 3 into the cylinder 1, and lock it with screws.

[0044] ④ Install the oil pipe joint 13 and the air pipe joint 8 at the corresponding positions of the cylinder body 1 and the sensing ring 31, and the assembly of the machine tool spindle hydraulic cylinder is completed.

[0045] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A main spindle hydraulic cylinder, comprising a cylinder body (1) and a cylinder cover (2) mounted on the cylinder body (1), wherein a piston (3) is mounted inside the cylinder body (1) and the cylinder cover (2) and moves along the axial direction, and characterized in that: The piston (3) is fixedly connected to a sensing ring (31) at the end close to the cylinder cover (2) and moves with the piston (3). A piston seal (4) is installed between the cylinder body (1), the cylinder cover (2) and the piston (3). A groove is provided on the cylinder cover (2) and a first sealing ring (5) is provided between the piston (3). A groove is provided on the cylinder body (1) and a second sealing ring (6) is provided between the piston (3). A connected air guide channel (7) is provided in the piston (3) and the sensing ring (31). An air pipe joint (8) is installed on the outer side of the sensing ring (31) at the outer end of the air guide channel (7). Positioning holes (9) are provided at the corresponding ends of the piston (3) and the cylinder cover (2). A positioning pin (10) is installed in the positioning hole (9) at the end of the piston (3), and the positioning pin (10) is matched with the positioning hole (9) at the end of the cylinder cover (2).

2. A spindle hydraulic cylinder according to claim 1, characterized in that: The outer wall of the cylinder body (1) adjacent to the cylinder head (2) is provided with a first oil inlet (11) and a second oil inlet (12) staggered up and down, and an oil pipe joint (13) is installed inside the first oil inlet (11) and the second oil inlet (12).

3. The main spindle hydraulic cylinder according to claim 1, characterized in that: The cylinder body (1), the cylinder head (2), the piston (3), the piston seal (4) and the first seal ring (5) form a tool loosening hydraulic oil chamber, and the cylinder body (1), the piston (3), the piston seal (4) and the second seal ring (6) form a tool pulling hydraulic oil chamber.

4. The main spindle hydraulic cylinder according to claim 1, characterized in that: The piston seal (4) comprises an O-ring (41) and an anti-wear ring (42). The O-ring (41) has several groups, which are arranged between the butting parts of the cylinder body (1) and the cylinder head (2), between the fitting parts of the cylinder head (2) and the piston (3), and between the fitting parts of the cylinder body (1) and the piston (3). The anti-wear ring (42) has two groups, which are arranged between the cylinder body (1) and the cylinder head (2) and the piston (3), respectively. The receiving grooves of the O-ring (41) and the anti-wear ring (42) are both provided on the cylinder body (1) and the cylinder head (2).

5. A spindle hydraulic cylinder according to claim 4, characterized in that: The air guide channel (7) comprises a straight channel (71) penetrating the piston (3) and a corner channel (72) on the sensing ring (31); the corner channel (72) and the straight channel (71) are connected after the cylinder body (1) and the cylinder head (2) are fixedly connected and are sealed by an O-ring (41).

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