A rocker arm double damping anti-sway mechanism and cutting machine tool

Abstract

The invention discloses a rocker arm double damping anti-sway mechanism and a cutting machine tool, which comprises a counterweight block, which is installed in a cavity in the middle of a rocker arm body, in which a damping sleeve is also installed, one end of the damping sleeve is open, and the other end is fixedly connected to a connecting piece at the end of the rocker arm body, the connecting piece is used to connect a cutting tool, one end of the counterweight block passes through the open hole and is sleeved in the damping sleeve, and the other end is exposed from the damping sleeve, the damping sleeve comprises a connecting portion and a sleeve portion integrally formed with the connecting portion, the connecting portion is used to be fixedly connected to the connecting piece, the sleeve portion is used to sleeve the counterweight block, and there is a clearance fit between the inner end surface of the sleeve portion and the outer surface of the counterweight block, the rocker arm body of the cutting machine tool comprises a double damping shock absorbing mechanism, and the rocker arm body is damped by the double damping shock absorbing mechanism.

Description

Technical Field

[0001] The invention relates to the technical field of cutting equipment, in particular to a rocker arm double damping anti-sway mechanism and a cutting machine tool. Background Art

[0002] The rocker arm is the execution end of the cutting machine, which is mainly used to install the tool. When the cutting machine is used to cut metal, the drive motor drives the rocker arm to drive the tool to move, remove the excess material on the workpiece, and obtain parts that meet the requirements of shape, dimensional accuracy, etc. However, due to the certain rigidity of metal, the rocker arm will vibrate due to the influence of cutting resistance, feed resistance and other forces during metal cutting. The greater the rigidity of the metal and the deeper the cutting depth, the greater the vibration amplitude of the rocker arm. In addition, during the cutting process of metal parts, the machine tool body and its rocker arm are easily affected by external factors such as the drive motor and other vibration equipment, which further increases the vibration amplitude of the rocker arm, seriously affecting the cutting accuracy of metal parts. Summary of the invention

[0003] In view of the defects existing in the prior art, the present invention provides a rocker arm double damping anti-sway mechanism and a cutting machine tool, which can reduce the radial swing of the rocker arm and improve the cutting accuracy of metal parts.

[0004] To achieve the above object, the present invention adopts the following technical solution:

[0005] A double damping anti-sway mechanism for a rocker arm, comprising a counterweight block, which is installed in a cavity in the middle of a rocker arm body, and is characterized in that a damping sleeve is also installed in the cavity, one end of the damping sleeve is open, and the other end is fixedly connected to a connecting piece at the end of the rocker arm body, and the connecting piece is used to connect a cutting tool; the damping sleeve comprises a connecting portion and a sleeve portion integrally formed with the connecting portion, the connecting portion is used to be fixedly connected to the connecting piece, the sleeve portion is a spring sleeve, which is used to sleeve the counterweight block, one end of the counterweight block passes through an opening on one side of the sleeve portion and is sleeved on the damping sleeve, and the other end is exposed from the damping sleeve, and the inner end surface of the sleeve portion is clearance-matched with the outer end surface of the counterweight block sleeved thereon.

[0006] Its further characteristic is that

[0007] The outer surface of the connecting part is provided with an external thread, the inner surface of the connecting piece is provided with an internal thread matching the external thread, the sleeve portion comprises an annular fixing portion and a plurality of spring sheets, one end of the plurality of spring sheets is circumferentially spaced along one end of the fixing portion, the other end of the annular fixing portion is fixedly connected to the connecting part, and the outer surface of the hole at the other end of the spring sheet is sleeved with an annular clamp;

[0008] The outer surface of the hole at the other end of the spring piece is respectively provided with an inwardly concave groove, the inner diameter of the groove matches the outer diameter of the clamp, the grooves are evenly spaced circumferentially to form a ring shape matching the shape of the clamp, and the clamp is sleeved in the groove;

[0009] The hole wall of the sleeve portion is provided with eight opening slots and contains nine spring pieces;

[0010] A cooling pipe is arranged in the rocker arm body, one end of the cooling pipe passes through the middle of the connecting part, the sleeve part and the counterweight block in sequence and then communicates with other pipes inside the machine tool, and the other end passes through the middle of the connecting piece and then communicates with the corresponding pipe in the tool, and a first gap is arranged between the outer surface of the cooling pipe and the inner end surface of the damping sleeve, the counterweight block and the connecting piece;

[0011] The counterweight block includes a narrow portion and a wide portion, one end of the narrow portion is fixedly connected to the wide portion, and the other end extends to the inside of the damping sleeve, and the outer surface of the narrow portion is gap-matched with the inner end surface of the wide portion; a first elastic member is provided between the counterweight block and the damping sleeve, and the first elastic member is an O-ring and is sleeved on the outer surface of one end of the narrow portion;

[0012] A support ring is arranged in the cavity, the support ring is fixed to the rocker arm body by screws, and the support ring is arranged adjacent to the other end of the wide portion;

[0013] A sealing ring is provided on the inner outer edge of the support ring;

[0014] A second elastic member is provided between the outer edge surface of the other end of the wide portion and the inner end of the support ring, and the second elastic member is an O-ring;

[0015] The sealing ring, the first elastic member and the second elastic member are all made of rubber;

[0016] The outer surface of the side end of the wide portion is covered with a protective cushion;

[0017] The protective software is silica gel;

[0018] A gap is provided between the outer surface of the counterweight block, the outer surface of the damping sleeve and the inner wall of the cavity, and the gap is filled with damping fluid;

[0019] The damping fluid comprises silicone oil.

[0020] A cutting machine tool, comprising a rocker arm body, one end of which is connected to a turning tool head via the connecting piece, and characterized in that the rocker arm body comprises a rocker arm double damping and anti-sway mechanism, the rocker arm body is driven by a driving device to drive the turning tool head to cut metal parts, and during the cutting process, the rocker arm is damped by the rocker arm double damping and anti-sway mechanism.

[0021] Its further characteristic is that

[0022] The step of damping the rocker arm by the rocker arm double damping anti-sway mechanism comprises: transmitting the vibration of the rocker arm body to the counterweight block through the damping sleeve;

[0023] The counterweight generates vibrations, including axial movement and radial shaking. The frequency and amplitude of the axial movement are smaller than the frequency and amplitude of the radial shaking, and the initial time of the vibration is delayed from the initial time of the displacement of the rocker arm body.

[0024] The following beneficial effects can be achieved by adopting the above structure of the present invention: the rocker arm dual damping anti-sway mechanism includes a damping sleeve, one end of which is fixedly connected to a connecting piece, and the connecting piece is fixedly connected to the rocker arm body. Therefore, during the cutting process, when the rocker arm body generates high-frequency vibration, it can be transmitted to the damping sleeve through the connecting piece, and then transmitted to the counterweight by the damping sleeve. However, since one end of the counterweight is sleeved in the damping sleeve, the damping sleeve limits the vibration frequency of one end of the counterweight, so that the radial shaking frequencies of the two ends of the counterweight are different, and the end with a low frequency plays a role in hindering the continuous shaking. The hindering force is fed back to the rocker arm by the damping sleeve, thereby reducing the radial amplitude of the rocker arm and improving the cutting accuracy of metal parts.

[0025] One end of the counterweight block of the present application is mounted in a damping sleeve, which includes a plurality of spring sheets, which are circumferentially spaced to form a spring sleeve. When the rocker arm is affected by the cutting vibration of the machine tool itself and vibrates, and is also affected by external vibration factors such as the motor to generate high-frequency vibration, the restriction degree of the opening grooves between the spring sheets changes linearly, thereby limiting the radial shaking amplitude of the counterweight block as the high-frequency vibration of the rocker arm increases. The reduction in the radial shaking of the counterweight block prevents the continuation of the vibration, and the resistance is fed back to the rocker arm by the damping sleeve, thereby reducing the radial shaking amplitude of the rocker arm, thereby improving the cutting accuracy of metal parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0027] Figure 2 It is a schematic diagram of the three-dimensional structure of the present invention (the rocker arm body is omitted);

[0028] Figure 3It is a schematic diagram of the three-dimensional structure of the present invention (the rocker arm body and the connecting parts are omitted);

[0029] Figure 4 It is a schematic diagram of the three-dimensional structure of the counterweight block of the present invention;

[0030] Figure 5 It is a schematic cross-sectional structure diagram of the main view of the present invention;

[0031] Figure 6 It is a schematic diagram of the three-dimensional structure of the turning tool head of the present invention. DETAILED DESCRIPTION

[0032] The disclosure below provides many different embodiments or examples to realize different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0033] At present, the vibration of the shock-absorbing mechanism of conventional cutting machine tools is generally reduced by parallel anti-vibration method, that is, by making the external vibration frequency and the vibration frequency of the anti-vibration mechanism different and mutually restraining. However, when using this anti-vibration method to reduce vibration, it is very easy for the external vibration and the internal mechanism vibration to have the same frequency and direction after a certain frequency interval, resulting in a sudden increase in vibration.

[0034] In order to solve the existing problem that vibrations of the same frequency and direction are prone to occur, resulting in poor shock absorption effect of cutting machine tools, this application provides the following specific embodiment of a rocker arm double damping shock absorption structure based on the analysis of the transmission form between external vibrations and the tool.

[0035] See Figure 1~Figure 5The specific structure of the rocker arm dual damping anti-sway mechanism includes a counterweight block 1, which is installed in a cavity 3 in the middle of the rocker arm body 2. A damping sleeve 4 is also installed in the cavity 3. One end of the damping sleeve 4 is open, and the other end is fixed to a connecting piece 5 at the end of the rocker arm body. The connecting piece is a modular interface for connecting a cutting tool. The damping sleeve 4 includes a connecting portion 41, and a sleeve portion 42 integrally formed with the connecting portion 41. The outer surface of the connecting portion 41 is provided with an external thread, and the inner surface of the connecting piece 5 is provided with an internal thread matching the external thread. The sleeve portion is a spring sleeve structure, including an annular fixing portion 421, a plurality of spring pieces 422, and the gaps between the spring pieces are open grooves 423. The plurality of spring pieces 422 are circumferentially spaced along one end of the fixing portion 421. The other end of the annular fixing portion 421 is fixedly connected to the connecting portion 41, and the orifice of the sleeve portion is sleeved with an annular clamp 43.

[0036] Among them, the specific structure of the clamp 43 is: the non-connecting ends of the spring pieces 422 are respectively provided with inwardly recessed grooves, the inner diameter of the grooves matches the outer diameter of the clamp, and the grooves are evenly spaced circumferentially to form a ring shape matching the shape of the clamp; in this embodiment, the hole wall of the sleeve part is provided with eight open grooves 423 and contains nine spring pieces 422.

[0037] One end of the counterweight 1 passes through the opening (hole) on one side of the sleeve and is sleeved in the damping sleeve 4, and is clamped by the clamp 43, and the other end is exposed to the damping sleeve 4. The specific structure of the counterweight and its installation structure with the damping sleeve are as follows: the counterweight includes a narrow portion 11 and a wide portion 12, one end of the narrow portion 11 is fixedly connected to the wide portion 12, and the other end extends to the inside of the damping sleeve 4, and the outer surface of the narrow portion 11 is gap-matched with the inner end surface of the wide portion 12.

[0038] During cutting, the rocker arm (i.e., the tool bar on the machine tool used to connect the cutting tool) is affected by the vibration of the driving motor, the cutting vibration, and other external vibration factors, causing the rocker arm body 2 to generate high-frequency vibration, which is transmitted to the damping sleeve 4 through the connecting piece 5, and then transmitted to the counterweight 1 through the damping sleeve 4 and the clamp 43. In order to reduce the collision and wear between the counterweight and the damping sleeve during the vibration process, a first elastic member 44 is provided between the counterweight 1 and the damping sleeve 4. The first elastic member 44 is a rubber O-ring and is sleeved on the outer surface of one end of the narrow portion 12.

[0039] A cooling pipe 6 is provided in the rocker arm body. One end of the cooling pipe 6 passes through the connecting piece 5, the connecting part 41, the sleeve part 42, and the middle part of the counterweight block 1 in sequence and then communicates with other pipes inside the machine tool. The other end passes through the middle part of the connecting piece and then communicates with the corresponding pipe in the tool. The cooling pipe 6 is used to transmit coolant. In this embodiment, a gap is provided between the outer surface of the cooling pipe and each component. The setting of the gap prevents the collision between the various components and the cooling pipe and causes wear or damage when the rocker arm body vibrates.

[0040] In the present application, a support ring 31 is also provided in the cavity 3, and the support ring 31 is fixed to the rocker body 2 by screws, and the support ring 31 is arranged adjacent to the other end of the wide portion 12; the provision of the support ring 31 facilitates the installation of different counterweights, and when the cutting metal and the type of tool change, in order to match the length and weight of the counterweight in the rocker body 2 with the actual swing amplitude, the installation position of the support ring 31 in the cavity is adjusted to meet the replacement and installation requirements of different counterweights. A sealing ring 14 is provided on the inner outer edge of the support ring 31, and the sealing ring 14 is a rubber O-ring, and the provision of the sealing ring 14 prevents leakage of the damping fluid.

[0041] A second elastic member 13 is arranged between the outer edge surface of the other end of the wide portion 12 of the counterweight 1 and the inner side end of the support ring 31. The second elastic member 13 is an O-ring made of rubber and has elasticity. When the counterweight is shaken laterally (i.e., radially shaken) to squeeze the second elastic member, the second elastic member plays a damping role to prevent the counterweight from directly colliding with the support ring. A protective cushion is provided on the outer surface of the side end of the wide portion 12. The protective cushion is made of silica gel and has elasticity to prevent the counterweight from colliding with the rocker arm body. Experimental research has found that during the vibration reduction process, the collision between the counterweight and the rocker arm body is one of the reasons for the same-frequency vibration of the counterweight and the rocker arm body. The arrangement of the first elastic member 44 between the counterweight 1 and the damping sleeve 4 and the arrangement of the second elastic member between the counterweight and the support ring, while reducing collision wear, also avoids the same-frequency situation of the counterweight and the rocker arm body, thereby further reducing the amplitude of the rocker arm body (mainly referring to the amplitude of radial shaking).

[0042] A gap is provided between the outer surface of the counterweight 1, the outer surface of the damping sleeve 4 and the inner wall of the cavity 3, and the gap is filled with a damping fluid 7; the main component of the damping fluid is silicone oil, and when the counterweight swings, the damping fluid plays a damping role, further reducing the vibration frequency of the counterweight, so that the vibration frequency of the counterweight is not completely equal to the vibration frequency of the swinging body.

[0043] The present application also provides a cutting machine tool using the rocker arm dual damping anti-sway mechanism, the cutting machine tool comprises a rocker arm body 2, one end of the rocker arm body 2 is connected to a cutting tool (a turning tool head, see Figure 6 ) is connected, and the rocker arm body 2 is provided with the above-mentioned rocker arm double damping and anti-sway mechanism. The rocker arm body 2 drives the turning tool head to cut the metal parts through the driving device (motor). During the cutting process, the rocker arm is damped by the rocker arm double damping and anti-sway mechanism.

[0044] When the rocker arm is affected by its own vibration, external vibration factors such as the motor, etc., high-frequency vibration is generated, and the high-frequency vibration includes radial shaking and axial movement. The frequency and amplitude of the axial movement are very small and can be temporarily ignored. Therefore, the function of the double damping anti-sway mechanism of the rocker arm of the present application is mainly to suppress radial shaking, reduce the frequency and amplitude of radial shaking of the rocker arm, and damp the rocker arm through the double damping anti-sway mechanism of the rocker arm. The steps include: S1, the vibration of the rocker arm body 2 is transmitted to the counterweight block 1 through the damping sleeve 4;

[0045] S2, the counterweight 1 vibrates, but due to the counterweight's own gravity, static inertia, and the tension of the damping sleeve and the clamp, the initial vibration time of the counterweight is delayed after the initial displacement time of the rocker arm body 2, thereby generating resistance, and one end of the counterweight is restricted by the damping sleeve, and the vibration frequency is lower than the frequency of the other end, preventing the counterweight and the rocker arm body from vibrating at the same frequency. The smaller vibration frequency and amplitude of the counterweight are fed back to the rocker arm body along the damping sleeve and the connecting piece, thereby reducing the lateral shaking amplitude and frequency of the rocker arm body 2, and avoiding the problem of reduced cutting accuracy due to the influence of the larger shaking amplitude on the turning tool head.

[0046] The double damping anti-sway mechanism of the rocker arm of the present application limits the shaking amplitude of the configuration block through the damping sleeve, so as to avoid the shaking frequency of the rocker arm body being consistent with the shaking frequency of the fixed end of the mechanical damping sleeve. The other end of the damping sleeve is a plurality of open grooves with weak limiting ability. The setting of the clamp at the orifice enhances the rebound ability, thereby further suppressing the vibration frequency and amplitude of the counterweight block. Therefore, the specific functions of the damping sleeve and the counterweight block in the present application are as follows: 1. The density of the counterweight block itself is relatively large (the gravity is relatively large), which can play a role in reducing the small amplitude in the high-frequency amplitude to a certain extent; 2. The damping sleeve and the clamp limit the radial shaking frequency of one end of the counterweight block, so that the radial shaking frequencies of the two ends of the counterweight block are inconsistent, and the end with low frequency plays a role in hindering the continuous shaking; 3. The mechanical damping sleeve and the damping fluid in the cavity accelerate the anti-sway counterweight block to return to its initial position, consume a large amount of shaking kinetic energy, and play a role in effectively reducing the shaking amplitude of the rocker arm body.

[0047] The above are only preferred embodiments of the present application, and the present invention is not limited to the above embodiments. It is understood that other improvements and changes directly derived or associated by those skilled in the art without departing from the spirit and concept of the present invention should be considered to be included in the protection scope of the present invention.

Claims

1. A rocker arm dual damping anti-sway mechanism, comprising a counterweight block, wherein the counterweight block is installed in a cavity in the middle of the rocker arm body, characterized in that: A damping sleeve is also installed in the cavity, one end of the damping sleeve is open, and the other end is fixedly connected to the connecting piece at the end of the rocker arm body, and the connecting piece is used to connect the cutting tool; the damping sleeve includes a connecting part and a sleeve part integrally formed with the connecting part, the connecting part is used to be fixedly connected to the connecting piece, the sleeve part is a spring sleeve, which is used to sleeve the counterweight block, one end of the counterweight block passes through the hole on one side of the sleeve part and is sleeved on the damping sleeve, and the other end is exposed to the damping sleeve, and the inner end surface of the sleeve part is gap-matched with the outer end surface of the counterweight block sleeved thereon; a support ring is arranged in the cavity, and the support ring is fixed to the rocker arm body by screws; The outer surface of the connecting part is provided with an external thread, the inner surface of the connecting piece is provided with an internal thread matching the external thread, the sleeve part comprises an annular fixing part and a plurality of spring pieces, the hole wall of the sleeve part is provided with eight opening grooves and contains nine spring pieces; one end of the spring piece is circumferentially spaced and distributed along one end of the fixing part, the other end of the annular fixing part is fixedly connected to the connecting part, and the outer surface of the hole opening of the other end of the spring piece is sleeved with an annular clamp; The other ends of the spring pieces are respectively provided with inwardly recessed slots, the inner diameter of the slots matches the outer diameter of the clamp, the slots are evenly spaced circumferentially to form a ring shape matching the shape of the clamp, and the clamp is sleeved in the slots; A cooling pipe is arranged in the rocker arm body, one end of the cooling pipe passes through the middle parts of the damping sleeve and the counterweight block in sequence and then communicates with other pipes inside the machine tool, and the other end is connected to the middle part of the connecting piece and then communicates with the corresponding pipe in the tool, and a first gap is arranged between the outer surface of the cooling pipe and the inner end surfaces of the damping sleeve, the counterweight block and the connecting piece.

2. The rocker arm dual damping anti-sway mechanism according to claim 1, characterized in that: The counterweight block includes a narrow portion and a wide portion, one end of the narrow portion is fixedly connected to the wide portion, and the other end extends to the interior of the damping sleeve, and the outer surface of the narrow portion is gap-fitted with the inner end surface of the wide portion; a first elastic member is arranged between the counterweight block and the damping sleeve, and the first elastic member is a rubber O-ring.

3. The rocker arm dual damping anti-sway mechanism according to claim 2, characterized in that: A sealing ring is arranged on the inner outer edge of the support ring; a second elastic member is arranged between the outer edge surface of the other end of the wide portion and the inner end of the support ring, and the second elastic member is a rubber O-ring.

4. The rocker arm dual damping anti-sway mechanism according to claim 3, characterized in that: The outer surface of the side end of the wide portion is sheathed with an elastic protective pad; the protective pad is made of silica gel.

5. The rocker arm dual damping anti-sway mechanism according to claim 1 or 4, characterized in that: A gap is provided between the outer surface of the counterweight block, the outer surface of the damping sleeve and the inner wall of the cavity, and the gap is filled with damping fluid.

6. A cutting machine tool, comprising the rocker arm body, one end of the rocker arm body being connected to a turning tool head through the connecting member, characterized in that: The rocker arm body includes the rocker arm double damping and anti-sway mechanism described in claim 1. The rocker arm body is driven by a driving device to drive the turning tool head to cut metal parts. During the cutting process, the rocker arm is damped by the rocker arm double damping and anti-sway mechanism.

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