Metering device for preventing reverse clearance of machine tool

Abstract

The utility model relates to the field of measuring instruments, in particular to a metering device, which comprises a dial indicator body. The device further comprises a universal seat mechanism. The universal seat mechanism comprises a magnetic suction seat, a universal frame arranged on the magnetic suction seat and a clamping head for clamping a meter body, and the universal frame is connected with the clamping head; three movable joints are arranged on the universal frame; the three movable joints are respectively provided with a locking mechanism; a locking switch is also arranged; the universal frame comprises a first connecting rod and a second connecting rod; the first connecting rod and the second connecting rod are connected through a first movable joint; a second movable joint is arranged at the other end of the first connecting rod; a third movable joint is arranged at the other end of the second connecting rod; the locking switch is connected to the locking mechanism of the first movable joint; the two sections of linkage mechanisms are respectively connected to the locking mechanism of the second movable joint and the locking mechanism of the third movable joint; the position of the dial indicator is convenient to fix, and the dial indicator can perform metering measurement conveniently.

Description

Technical Field

[0001] The utility model relates to the field of measuring instruments, and particularly relates to a dial indicator device. Background Art

[0002] Since there must be a certain clearance between the lead screw and the nut, when changing from forward rotation to reverse rotation, within a certain angle, although the lead screw rotates, the nut has to wait until the clearance is eliminated before driving the workbench to move. This clearance is the backlash.

[0003] However, when using a dial indicator to measure a workpiece placed on a machine tool, especially when measuring the axial dimension of a part hole or calibrating an internal hole of a part, for an internal hole with a complex shape, in order for the dial indicator device to touch the axial surface of the internal hole to be measured or the dial indicator body to avoid interference with the part, the dial indicator needs to be placed in different positions. After the dial indicator is placed in different positions, it is inconvenient to fix the dial indicator device, resulting in inconvenient dial indicator measurement. Summary of the Utility Model

[0004] The purpose of this part is to outline some aspects of the embodiments of the present utility model and briefly introduce some preferred embodiments. In this part, as well as in the abstract of the specification and the title of the utility model of this application, some simplifications or omissions may be made to avoid obscuring the purpose of this part, the abstract of the specification, and the title of the utility model. However, such simplifications or omissions shall not be used to limit the scope of the present utility model.

[0005] In view of the problems existing in the above-mentioned prior art, the present utility model is proposed.

[0006] To solve the above technical problems, the present utility model provides the following technical solutions:

[0007] A dial indicator device for preventing the backlash of a machine tool, comprising a dial indicator body;

[0008] It further includes a universal joint mechanism for fixing the body;

[0009] The universal joint mechanism includes a magnetic suction seat, a universal bracket arranged on the magnetic suction seat, and a clamping head for clamping the body. The universal bracket is connected to the clamping head;

[0010] At least three movable joints are arranged on the universal bracket;

[0011] Locking mechanisms that can be opened and closed with locking functions are respectively arranged on the three movable joints;

[0012] A locking switch is further arranged;

[0013] The locking switch is synchronously linked with the three locking mechanisms;

[0014] The universal bracket includes a first connecting rod and a second connecting rod;

[0015] The first connecting rod and the second connecting rod are connected by a first movable joint;

[0016] The other end of the first connecting rod is provided with a second movable joint;

[0017] The other end of the second connecting rod is provided with a third movable joint;

[0018] The locking switch is connected to the locking mechanism of the first movable joint;

[0019] And through two linkage mechanisms, it is respectively connected to the locking mechanisms of the second movable joint and the third movable joint.

[0020] In the above design, first, by setting a gimbal, at least three movable joints are provided on the gimbal. The gimbal has the function of being able to pose the watch body in different orientations, so that the watch body can be placed at various angles to adapt to various situations. When it is convenient for the dial indicator to measure or calibrate the axial dimension of the part hole, especially for the inner hole with a complex shape, by setting a magnetic suction seat and a clamping head, it is convenient to place the dial indicator at different positions, making it more convenient to use. Finally, a locking switch is provided. The locking switch is synchronously linked with the three locking mechanisms, so that the locking switch can lock the three movable joints at one time, facilitating the fixation of the position of the dial indicator and facilitating the dial indicator to perform dial measurement.

[0021] Preferably, both the first connecting rod and the second connecting rod are made of hollow metal rods; the locking switch has at least two linkage mechanisms; one linkage mechanism is arranged in the hollow part of the first connecting rod; the other linkage mechanism is arranged in the hollow part of the second connecting rod; by setting hollow metal rods, it is convenient for the two linkage mechanisms to be linked with the locking mechanisms of the second movable joint and the third movable joint through the hollow cavities of the first connecting rod and the second connecting rod.

[0022] Preferably, a ball head seat for connecting the magnetic suction seat is arranged on the first connecting rod, which is called a magnetic suction ball head seat; a ball head is arranged on the magnetic suction seat and is matched with the magnetic suction ball head seat, which is called a first ball head. The first ball head is arranged in the magnetic suction ball head seat, so that the magnetic suction seat and the gimbal can be rotatably matched; the magnetic suction ball head seat and the first ball head matched with it form a second movable joint; through the second movable joint formed by the cooperation of the magnetic suction ball head seat and the first ball head, the first connecting rod and the magnetic suction seat can be placed at different angles, facilitating the dial indicator to be placed at different angles.

[0023] Preferably, the second connecting rod is provided with a ball head seat connected to the clamping head, called the clamping ball head seat; the clamping head is provided with another ball head cooperating with the clamping ball head seat, called the second ball head, and the second ball head is arranged in the clamping ball head seat, so that the clamping head and the universal mount can be rotatably matched; the clamping ball head seat and the second ball head cooperating therewith constitute a third movable joint; through the third movable joint formed by the clamping ball head seat and the second ball head, the second connecting rod and the clamping head can be placed at different angles, which is convenient for adjusting the dial indicator to different angles.

[0024] Preferably, one end of the first connecting rod is connected to the magnetic ball head seat, and the other end is provided with a first circular sleeve, and a rotating shaft is connected in the first circular sleeve; one end of the second connecting rod is connected to the clamping ball head seat, and the other end of the second connecting rod is connected to the second circular sleeve rotatably mounted on the rotating shaft; the rotating shaft of the first connecting rod and the second circular sleeve of the second connecting rod mounted on the rotating shaft constitute a first movable joint; the first movable joint is formed by the rotating shaft of the first connecting rod and the second circular sleeve of the second connecting rod mounted on the rotating shaft, the other end of the first connecting rod and the magnetic ball head seat and the first ball head matched therewith constitute a second movable joint, the clamping ball head seat of the second connecting rod and the second ball head matched therewith constitute a third movable joint, and the three movable joints are linked by using a universal mount, which has the function of swinging the watch body in different directions, so that the watch body can be placed at various angles to adapt to various situations, which is convenient for the dial indicator to measure or calibrate the axial size of the part hole, especially for the inner hole with complex shape.

[0025] Preferably, the locking switch adopts a knob-type locking switch, which has a knob arranged on a first circular sleeve and a sliding component arranged in a second circular sleeve. The knob-type locking switch also includes a screw connected to the knob, and the screw is threadedly matched with the sliding component; the first joint is conveniently locked by the knob-type locking switch.

[0026] Preferably, the linkage mechanism adopts a push rod, the push rod in the hollow cavity of the first connecting rod is called the first push rod, and the first push rod has a portion extending into the first circular sleeve; the push rod in the hollow cavity of the second connecting rod is called the second push rod, and the second push rod has a portion extending into the second circular sleeve.

[0027] Preferably, the knob-type locking switch further includes a sleeve sleeved on the screw rod. The sleeve has a part extending into the first round sleeve, and the knob abuts against the sleeve. The sleeve has a structure for pushing a first ejector rod structure extending into the first round sleeve to retract into the hollow cavity of the first connecting rod. The first ejector rod retracted into the hollow cavity of the first connecting rod abuts against the first ball head in the magnetic absorption ball head seat. The sliding member has a structure for pushing a second ejector rod structure extending into the second round sleeve to retract into the hollow cavity of the second connecting rod. The first ejector rod retracted into the hollow cavity of the first connecting rod abuts against the second ball head in the clamping ball head seat. Thus, through the first ejector rod and the second ejector rod of the locking switch, the locking switch can be synchronously linked with the three locking mechanisms. By providing the first ejector rod and the second ejector rod, when the knob-type locking switch rotates to lock or close the first movable joint, the sleeve and the sliding member can push the first ejector rod and the second ejector rod. The first ejector rod abuts against the first ball head in the magnetic absorption ball head seat, and the second ejector rod abuts against the second ball in the clamping ball head seat, realizing that the knob-type locking switch can lock the three movable joints at one time, facilitating the position fixing of the dial indicator and facilitating the dial indicator to perform dial measurement.

[0028] Preferably, an elastic member with an elastic force direction towards the direction of the first movable joint is connected to the first ejector rod, and a limiting protrusion is arranged on the first ejector rod to abut against the first connecting rod. Another elastic member with an elastic force direction towards the direction of the first movable joint is connected to the second ejector rod, and another limiting protrusion is arranged on the second ejector rod to abut against the second connecting rod. By providing the elastic member and another elastic member, the limiting protrusion and another limiting protrusion, the first ejector rod and the second ejector rod can automatically reset, facilitating loosening the knob-type locking switch at any time to adjust the position of the dial indicator body, making the dial indicator more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. Among them:

[0030] Figure 1 It is a schematic diagram of the overall structure of the dial indicator connecting the anti-backlash dial indicator device provided by an embodiment of the present invention;

[0031] Figure 2 It is a schematic diagram of the universal joint structure of the anti-backlash dial indicator device provided by an embodiment of the present invention;

[0032] Figure 3 It is a schematic cross-sectional structure diagram of the first connecting rod connecting the second connecting rod suitable for measuring the axial surface of the inner hole provided by an embodiment of the present invention. Detailed implementation mode

[0033] In order to make the above-mentioned objects, features, and advantages of the present utility model more understandable, the following will describe the specific implementation mode of the present utility model in detail with reference to the accompanying drawings of the specification.

[0034] In the following description, many specific details are set forth in order to fully understand the present utility model. However, the present utility model can also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

[0035] Secondly, the present utility model will be described in detail with reference to the schematic diagrams. When describing the embodiments of the present utility model in detail, for the convenience of explanation, the cross-sectional views showing the device structure will be enlarged locally out of the general scale, and the schematic diagrams are only examples and should not limit the scope of protection of the present utility model here. In addition, in actual production, three-dimensional spatial dimensions including length, width, and depth should be included.

[0036] Furthermore, the so-called "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that can be included in at least one implementation mode of the present utility model. The "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it an embodiment that is separate from or selectively exclusive of other embodiments.

[0037] Embodiment 1

[0038] Refer to Figures 1 - 3 , a dial indicator device for preventing the backlash of a machine tool, including a dial indicator body 1.

[0039] It also includes a universal joint mechanism for fixing the dial indicator body 1; the universal joint mechanism includes a magnetic suction seat 2, a direction frame 3 provided on the magnetic suction seat 2, and a clamping head 4 for clamping the dial indicator body 1. The universal joint 3 is connected to the clamping head 4; at least three movable joints are provided on the universal joint 3; on the three movable joints, there are respectively provided lockable and openable locking mechanisms with locking functions; there is also provided a locking switch 33; the locking switch 33 is synchronously linked with the three locking mechanisms; the universal joint 3 includes a first connecting rod 31 and a second connecting rod 32; the first connecting rod 31 and the second connecting rod 32 are connected by a first movable joint; the other end of the first connecting rod 31 is provided with a second movable joint; the other end of the second connecting rod 32 is provided with a third movable joint; the locking switch 33 is connected to the locking mechanism of the first movable joint; and through two sections of linkage mechanisms, it is respectively connected to the locking mechanisms of the second movable joint and the third movable joint; first, by setting the universal joint 3, at least three movable joints are provided on the universal joint 3, and the universal joint 3 has the function of being able to place the dial indicator body 1 in different orientations, so that the dial indicator body 1 can be placed at various angles to adapt to various situations, which is especially convenient when the dial indicator measures the axial dimension of the part hole or calibrates the inner hole of the part, especially for the inner hole with a complex shape. By setting the magnetic suction seat 2 and the clamping head 4, it is convenient to place the dial indicator at different positions, making it more convenient to use. Finally, there is provided a locking switch 33, and the locking switch 33 is synchronously linked with the three locking mechanisms, so that the locking switch 33 can lock the three movable joints at one time, facilitating the fixation of the position of the dial indicator and facilitating the dial indicator to perform dial indicator measurement.

[0040] A ball head seat for connecting the magnetic suction seat 2 is provided on the first connecting rod 31, which is called the magnetic suction ball head seat 311; a ball head matching with the magnetic suction ball head seat 311 is provided on the magnetic suction seat 2, which is called the first ball head 21. The first ball head 21 is arranged in the magnetic suction ball head seat 311, so that the magnetic suction seat 2 and the universal joint 3 are rotatably matched; the magnetic suction ball head seat 311 and the first ball head 21 matching with it constitute the second movable joint; through the second movable joint formed by the cooperation of the magnetic suction ball head seat 311 and the first ball head 21, the first connecting rod 31 and the magnetic suction seat 2 can be placed at different angles, facilitating the dial indicator to be placed at different angles.

[0041] One end of the first connecting rod 31 is connected to the magnetic ball head seat 311, and the other end is provided with a first circular sleeve 312, and a rotating shaft is connected in the first circular sleeve 312; one end of the second connecting rod 32 is connected to the clamping ball head seat 321, and the other end of the second connecting rod 32 is connected to the second circular sleeve 322 rotatably sleeved on the rotating shaft; the rotating shaft of the first connecting rod 31 and the second circular sleeve 322 of the second connecting rod 32 sleeved on the rotating shaft constitute a first movable joint; the rotating shaft of the first connecting rod 31 and the second circular sleeve 322 of the second connecting rod 32 sleeved on the rotating shaft constitute a second movable joint. A movable joint, the other end of the first connecting rod 31 and the magnetic ball head seat 311 and the first ball head 21 matched therewith constitute a second movable joint, the clamping ball head seat 321 of the second connecting rod 32 and the second ball head 41 matched therewith constitute a third movable joint, and the three movable joints are linked using a universal mount 3 with the function of swinging the watch body 1 in different orientations, so that the watch body 1 can be placed at various angles to adapt to various situations, which is convenient for the dial indicator to measure the axial size of the part hole or calibrate the inner hole of the part, especially for the inner hole of the complex shape.

[0042] The second connecting rod 32 is provided with a ball head seat connected to the clamping head 4, which is called the clamping ball head seat 321; the clamping head 4 is provided with another ball head that cooperates with the clamping ball head seat 321, which is called the second ball head 41. The second ball head 41 is arranged in the clamping ball head seat 321, so that the clamping head 4 and the universal joint 3 can be rotatably matched; the clamping ball head seat 321 and the second ball head 41 that cooperates with it constitute a third movable joint; the third movable joint formed by the clamping ball head seat 321 and the second ball head 41 can make the second connecting rod 32 and the clamping head 4 be placed at different angles, so that the dial indicator can be placed at different angles conveniently.

[0043] When in use, the first movable joint is formed by the rotating shaft of the first connecting rod 31 and the second circular sleeve 322 of the second connecting rod 32 sleeved on the rotating shaft, the other end of the first connecting rod 31 and the magnetic ball head seat 311 and the first ball head 21 matched therewith form a second movable joint, the clamping ball head seat 321 of the second connecting rod 32 and the second ball head 41 matched therewith form a third movable joint, and the three movable joints are linked with the universal mount 3, which has the function of swinging the watch body 1 in different directions, so that the watch body 1 can be placed at various angles to adapt to various situations, which is convenient for the dial indicator to measure the axial size of the part hole or calibrate the inner hole of the part, especially for the inner hole of the complex shape, the locking switch 33 is synchronously linked with the three locking mechanisms, so that the locking switch 33 can lock or open the three movable joints at one time, which is convenient for the placement and fixation of the dial indicator and the measurement of the dial indicator.

[0044] Example 2

[0045] Reference Figure 2 and Figure 3 , which is the second embodiment of the utility model, and this embodiment is based on the previous embodiment.

[0046] The first link 31 and the second link 32 are both hollow metal rods; the locking switch 33 has at least two linkage mechanisms; one linkage mechanism is arranged in the hollow part of the first link 31; the other linkage mechanism is arranged in the hollow part of the second link 32; by setting up the hollow metal rod, it is convenient for the two linkage mechanisms to be linked with the locking mechanisms of the second movable joint and the third movable joint through the hollow cavities of the first link 31 and the second link 32.

[0047] The locking switch 33 adopts a knob-type locking switch 33, which has a knob 331 arranged on the first circular sleeve 312 and a sliding component 332 arranged in the second circular sleeve 322. The knob-type locking switch 33 also includes a screw 333 connected to the knob 331, and the screw 333 is threadedly matched with the sliding component 332; the knob-type locking switch 33 is used to facilitate locking the first joint.

[0048] The linkage mechanism adopts a push rod. The push rod in the hollow cavity of the first connecting rod 31 is called a first push rod 313, and the first push rod 313 has a portion extending into the first circular sleeve 312; the push rod in the hollow cavity of the second connecting rod 32 is called a second push rod 323, and the second push rod 323 has a portion extending into the second circular sleeve 322.

[0049] The knob-type locking switch 33 also includes a sleeve 334 sleeved on the screw rod 333, the sleeve 334 has a portion extending into the first circular sleeve 312, and the knob 331 abuts against the sleeve 334; the sleeve 334 has a structure for pushing the first push rod 313 extending into the first circular sleeve 312 to retract into the hollow cavity of the first connecting rod 31, and the first push rod 313 retracted into the hollow cavity of the first connecting rod 31 abuts against the first ball head 21 in the magnetic ball head seat 311; the sliding component 332 has a structure for pushing the second push rod 323 extending into the second circular sleeve 322 to retract into the hollow cavity of the second connecting rod 32, and the first push rod 313 retracted into the hollow cavity of the first connecting rod 31 abuts against the second ball head 4 in the clamping ball head seat 321 1; thus, the locking switch 33 can be synchronously linked with the three locking mechanisms through the first push rod 313 and the second push rod 323 of the locking switch 33; by setting the first push rod 313 and the second push rod 323, when the knob-type locking switch 33 is rotated to lock or close the first movable joint, the sleeve 334 and the sliding component 332 can push the first push rod 313 and the second push rod 323 to push the first push rod 313 and the second push rod 323 to push the first ball head 21 in the magnetic ball head seat 311 and the second ball head 41 in the clamping ball head seat 321, so that the knob-type locking switch 33 can lock the three movable joints at one time, which is convenient for fixing the position of the dial indicator and facilitating the dial indicator to perform meter measurement.

[0050] An elastic member with an elastic force direction towards the first movable joint is connected to the first ejector rod 313, and the first ejector rod 313 is provided with a limiting protrusion that abuts against the first connecting rod 31; another elastic member with an elastic force direction towards the first movable joint is connected to the second ejector rod 323, and the second ejector rod 323 is provided with another limiting protrusion that abuts against the second connecting rod 32; by providing the elastic member and the other elastic member, and the limiting protrusion and the other limiting protrusion, the first ejector rod 313 and the second ejector rod 323 can automatically reset, which is convenient for loosening the knob-type locking switch 33 at any time to adjust the position of the body 1 of the dial indicator, making the use of the dial indicator more convenient.

[0051] During use, when the knob-type locking switch 33 rotates to lock or close the first movable joint, the sleeve 334 and the sliding member 332 can push the first ejector rod 313 and the second ejector rod 323. The first ejector rod 313 abuts against the first ball head 21 in the magnetic suction ball head seat 311, and the second ejector rod 323 abuts against the second ball head 41 in the clamping ball head seat 321, so that the knob-type locking switch 33 can lock three movable joints at one time, which is convenient for fixing the position of the dial indicator and convenient for the dial indicator to perform dial measurement. The elastic member and the other elastic member enable the first ejector rod 313 and the second ejector rod 323 to automatically reset. When the knob-type locking switch 33 is loosened, the first ejector rod 313 and the second ejector rod 323 re-enter the first circular sleeve 312 and the second circular sleeve 322, which is convenient for loosening the knob-type locking switch 33 at any time to adjust the position of the body 1 of the dial indicator, making the use of the dial indicator more convenient.

[0052] Importantly, it should be noted that the structures and arrangements of the present application shown in multiple different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who refer to this disclosure should easily understand that many modifications are possible without substantially departing from the novel aspects and advantages of the subject matter described in this application. For example, the dimensions, scales, structures, shapes, and proportions of various elements, as well as parameter values (e.g., temperature, pressure, etc.), installation arrangements, use of materials, color, orientation changes, etc. For example, an element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature, number, or position of discrete elements can be changed or altered. Therefore, all such modifications are intended to be included within the scope of the present utility model. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "means-plus-function" clause is intended to cover the structures that perform the functions described herein, and not only structurally equivalent but also equivalent structures. Other substitutions, modifications, changes, and omissions can be made in the design, operating conditions, and arrangements of the exemplary embodiments without departing from the scope of the present utility model. Therefore, the present utility model is not limited to specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0053] In addition, in order to provide a concise description of the exemplary embodiments, all features of the actual embodiments, i.e., those features that are not relevant to the currently considered best mode of implementing the present utility model or those features that are not relevant to the implementation of the present utility model, may not be described.

[0054] It should be understood that, in the development of any actual implementation, such as in any engineering or design project, a large number of specific implementation decisions may be made. Such development efforts may be complex and time-consuming, but for those of ordinary skill in the art who benefit from this disclosure, without excessive experimentation, the development efforts will be a routine task of design, manufacturing, and production.

[0055] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model and not to limit them. Although the present utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present utility model can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present utility model, and they should all be covered by the scope of the claims of the present utility model.

Claims

1. A meter device for preventing backlash of a machine tool, comprising a dial indicator body, characterized in that: Also included is a universal seat mechanism for fixing the watch body; The universal seat mechanism includes a magnetic seat, a universal frame arranged on the magnetic seat, and a clamping head for clamping the watch body, and the universal frame is connected to the clamping head; The universal mount is provided with at least three movable joints; The three movable joints are respectively provided with locking mechanisms that can be opened and closed and have locking functions; A locking switch is also provided; The locking switch is synchronously linked with the three locking mechanisms; The gimbal comprises a first connecting rod and a second connecting rod; The first connecting rod and the second connecting rod are connected via a first movable joint; The other end of the first connecting rod is provided with a second movable joint; The other end of the second connecting rod is provided with a third movable joint; The locking switch is connected to the locking mechanism of the first movable joint; And through the two-stage linkage mechanism, it is respectively connected to the locking mechanism of the second movable joint and the locking mechanism of the third movable joint.

2. The metering device for preventing machine tool backlash according to claim 1 is characterized in that: The first connecting rod and the second connecting rod are both hollow metal rods; A locking switch having at least two linkage mechanisms; A linkage mechanism is arranged in the hollow portion of the first connecting rod; Another section of the linkage mechanism is arranged in the hollow portion of the second connecting rod.

3. The metering device for preventing machine tool backlash according to claim 2 is characterized in that: The first connecting rod is provided with a ball head seat connected to the magnetic seat, which is called a magnetic ball head seat; The magnetic seat is provided with a ball head matched with the magnetic ball head seat, which is called a first ball head. The first ball head is arranged in the magnetic ball head seat, so that the magnetic seat and the universal mount can be rotatably matched; The magnetic ball head seat and the first ball head matched therewith constitute a second movable joint.

4. The metering device for preventing machine tool backlash according to claim 3 is characterized in that: The second connecting rod is provided with a ball head seat connected to the clamping head, which is called a clamping ball head seat; The clamping head is provided with another ball head matched with the clamping ball head seat, which is called a second ball head. The second ball head is arranged in the clamping ball head seat, so that the clamping head and the universal bracket can be rotatably matched; The clamping ball head seat and the second ball head matched therewith constitute the third movable joint.

5. The metering device for preventing machine tool backlash according to claim 4 is characterized in that: One end of the first connecting rod is connected to the magnetic ball head seat, and the other end is provided with a first circular sleeve, and the first circular sleeve is connected with a rotating shaft; One end of the second connecting rod is connected to the clamping ball head seat, and the other end of the second connecting rod is connected to the second circular sleeve rotatably sleeved on the rotating shaft; The rotating shaft of the first connecting rod and the second circular sleeve of the second connecting rod sleeved on the rotating shaft form a first movable joint.

6. The metering device for preventing machine tool backlash according to claim 5 is characterized in that: The locking switch adopts a knob-type locking switch, which has a knob arranged on a first circular sleeve and a sliding component arranged in a second circular sleeve. The knob-type locking switch also includes a screw connected to the knob, and the screw is threadedly matched with the sliding component.

7. The metering device for preventing machine tool backlash according to claim 6 is characterized in that: The linkage mechanism adopts a push rod, the push rod in the hollow cavity of the first connecting rod is called a first push rod, and the first push rod has a portion extending into the first circular sleeve; The push rod in the hollow cavity of the second connecting rod is called a second push rod, and the second push rod has a portion extending into the second circular sleeve.

8. The metering device for preventing machine tool backlash according to claim 7 is characterized in that: The knob-type locking switch further comprises a sleeve sleeved on the screw rod, the sleeve having a portion extending into the first circular sleeve, and the knob abuts against the sleeve; The sleeve has a structure that pushes the first push rod structure extending into the first round sleeve and retracts into the hollow cavity of the first connecting rod, and the first push rod retracted into the hollow cavity of the first connecting rod pushes against the first ball head in the magnetic ball head seat; The sliding component has a structure in which a second push rod structure extending into the second round sleeve is pushed back into the second connecting rod hollow cavity, and the first push rod retracted into the first connecting rod hollow cavity pushes against the second ball head in the clamping ball head seat; Thus, the locking switch can be synchronously linked with the three locking mechanisms through the first push rod and the second push rod of the locking switch.

9. The metering device for preventing machine tool backlash according to claim 8 is characterized in that: The first push rod is connected to an elastic component with its elastic force directed toward the first movable joint, and the first push rod is provided with a limiting protrusion abutting against the first connecting rod; The second push rod is connected to another elastic component with its elastic force direction facing the first movable joint, and the second push rod is provided with another limiting protrusion abutting against the second connecting rod.

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