Lead screw lead instrument drag chain unloading mechanism and method

Abstract

This invention relates to a drag chain unloading mechanism and method for a lead screw measuring instrument. The mechanism includes a multi-jointed swing arm, a locking ball head, a follower frame, a telescopic rod, a measuring head, rollers, and a drag chain. The multi-jointed swing arm is mounted on the follower frame and located on the side of the measuring head. The locking ball head is mounted on the telescopic rod, which is mounted on the multi-jointed swing arm. A compression spring is provided between the telescopic rod and the multi-jointed swing arm. The multi-jointed swing arm is mounted on the follower frame and locked by a knob. The rollers are mounted on the follower frame. A drag chain is mounted on the follower frame. This invention can eliminate the drag chain and pipeline tension acting on the lead screw measuring platform, preventing them from affecting precision measurement. The mechanism is easy to install and manufacture, and it solves the defect of external forces interfering with the precision measurement process, providing an effective solution for such instruments.

Description

TECHNICAL FIELD

[0001] The present application relates to a lead screw pitch measuring instrument, in particular to a lead screw pitch measuring instrument drag chain unloading mechanism and method. BACKGROUND

[0002] At present, a lead screw pitch measuring instrument, the measuring head is inserted into the thread groove, the measuring head is moved by the rotation of the lead screw, and the measuring platform is moved along the guide rail, the moving platform is provided with a drag chain, a gas pipe and other cables, the lead screw pitch measuring instrument has high performance requirements for the measuring system, the measuring force needs to be stable and unique, but due to the external force of the drag chain cable on the precision measuring platform, the motion of the measuring head is disturbed, which will seriously affect the stable and high-precision movement of the measuring platform. Although the measurement stability can be ensured by increasing the measurement force, the sensitivity of the measurement system to small errors will decrease significantly, and the measurement accuracy of the lead screw pitch measuring instrument will decrease greatly. In view of the above situation, an effective solution is needed. SUMMARY

[0003] The technical problem to be solved by the present application is to overcome the problems existing in the prior art, and to provide a lead screw pitch measuring instrument drag chain unloading mechanism and method, mainly for the lead screw pitch measuring instrument, to ensure reliable, simple and high-precision operation.

[0004] In order to solve the above problems, the technical scheme of the present application is as follows:

[0005] A lead screw pitch measuring instrument drag chain unloading mechanism, comprising a multi-joint swing rod, a clamping ball head, a follow-up frame, a multi-joint swing rod, an extension rod, a measuring head, a roller, and a drag chain, the multi-joint swing rod is installed on the follow-up frame and located on the side of the measuring head; the clamping ball head is installed on the extension rod, the extension rod is installed on the multi-joint swing rod, a compression spring is arranged between the extension rod and the multi-joint swing rod, the multi-joint swing rod is installed on the follow-up frame, the multi-joint swing rod is locked by a knob, the roller is installed on the follow-up frame; the drag chain is installed on the follow-up frame.

[0006] Further, the follow-up frame is located on the periphery of the measuring platform and is independent and not connected.

[0007] Further, the multi-joint swing rod comprises a knob, a first swing rod and a second swing rod, the first swing rod and the second swing rod are hingedly connected by nesting cooperation, and the angle between the first swing rod and the second swing rod is fixed by locking the knob.

[0008] Further, the follow-up frame comprises a roller frame, a connecting plate and a roller, the roller frame and the connecting plate form a closed frame and surround the measuring platform, and the roller rolls on the guide rail.

[0009] Further, the follow-up frame is driven by the clamping ball head through the multi-joint swing rod.

[0010] Further, the ball head and the measuring head contact the screw thread simultaneously during work.

[0011] A measuring method using a screw lead instrument measuring head mechanism, comprising the following steps:

[0012] First, select the corresponding diameter ball head according to the pitch, and fix it on the multi-joint swing lever;

[0013] Second, adjust the multi-joint swing lever so that the ball head contacts the screw thread;

[0014] Third, adjust the angle of the multi-joint swing lever so that the telescopic rod and the spring are compressed, ensuring that the ball head and the screw thread have a certain force, and the knob is locked;

[0015] Fourth, during measurement, the screw rotation drives the ball head to move axially, and drives the surrounding frame to move independently and synchronously with the measuring platform, and drives the drag chain to realize the unloading of the external force of the drag chain on the measuring platform.

[0016] Fifth, after the measurement is completed, the multi-joint swing lever retreats, and the ball head is separated from the screw.

[0017] The beneficial effects of the present application are:

[0018] 1) The pipeline drag chain tension acting on the screw measuring platform can be eliminated, avoiding interference with the precise measurement process and causing measurement errors, and the conversion time is short and the cost is low.

[0019] 2) The ball head realizes flexible contact with the screw thread through the compression spring, avoiding the interference of the ball head on the screw.

[0020] Therefore, the present application can solve the defects of the conventional measurement structure of the screw lead instrument, and provides an effective solution for such instruments. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a schematic diagram of the screw lead instrument unloading mechanism of the present application;

[0022] Figure 2 is a schematic diagram of the multi-joint swing lever of the screw lead instrument unloading mechanism of the present application;

[0023] Figure 3 is a schematic diagram of the telescopic rod of the screw lead unloading mechanism of the present application;

[0024] Figure 4 is a schematic diagram of the surrounding frame of the screw lead instrument unloading mechanism of the present application;

[0025] Figure 5 is a working schematic diagram of the screw lead instrument unloading mechanism of the present application. DETAILED DESCRIPTION

[0026] In order to make the technical means, creative features, purposes and effects of the present application easy to understand, the present application is further described below in combination with specific drawings.

[0027] As shown in the drawings, the lead screw lead instrument drag chain unloading mechanism of the present embodiment comprises a follow-up surrounding frame 1, a multi-joint swing rod 2, an L bracket 5 and a drag chain 6. Figure 1 The multi-joint swing rod 2 is installed on the follow-up surrounding frame 1 and located at the side of the measuring head 3; the follow-up surrounding frame 1 is a closed structure and located at the periphery of the measuring platform 4, and there is no any connection between them, and they are independent of each other.

[0028] As shown in the drawings, the multi-joint swing rod 2 comprises a primary knob 2-1, a primary swing rod 2-2, a secondary knob 2-5, a secondary swing rod 2-4 and an extension rod 2-3. The primary swing rod 2-2 and the secondary swing rod 2-4 are nested and matched, and the angle between the primary swing rod 2-2 and the secondary swing rod 2-4 is fixed by locking the primary knob 2-1 and the secondary knob 2-5. The extension rod 2-3 is arranged in the secondary swing rod 2-4.

[0029] Figure 2 As shown in the drawings, the extension rod 2-3 comprises a clamping ball head 2-3-1, a small shaft 2-3-2, a compression spring 2-3-3, a sliding sleeve 2-3-4 and a retaining ring 2-3-5. The clamping ball head 2-3-1 is fixed on the small shaft 2-3-2, and the shaft can be extended and retracted by the action of the spring 2-3-3.

[0030] As shown in the drawings, the follow-up surrounding frame 1 comprises a roller frame 1-2, a connecting plate 1-3 and a roller 1-1. The roller frame 1-2 and the connecting plate 1-3 form a closed frame and surround the measuring platform 4, and the roller 1-1 rolls on the guide rail. Figure 3 As shown in the drawings, the clamping ball head 2-3-1 is embedded in the thread groove of the lead screw 7, and the measuring head 3 is in synchronous contact with the lead screw 7 at the same time, and the clamping ball head 2-3-1 and the measuring head 3 are both driven by the rotation of the lead screw 7.

[0031] Figure 4 As shown in the drawings, the follow-up surrounding frame 1 comprises a roller frame 1-2, a connecting plate 1-3 and a roller 1-1. The roller frame 1-2 and the connecting plate 1-3 form a closed frame and surround the measuring platform 4, and the roller 1-1 rolls on the guide rail.

[0032] As shown in the drawings, the clamping ball head 2-3-1 is embedded in the thread groove of the lead screw 7, and the measuring head 3 is in synchronous contact with the lead screw 7 at the same time, and the clamping ball head 2-3-1 and the measuring head 3 are both driven by the rotation of the lead screw 7. Figure 5 A measuring method using a lead screw lead instrument measuring head mechanism, comprising the following steps:

[0033] First, select the corresponding diameter clamping ball head according to the pitch and fix it on the swing rod;

[0034] Second, adjust the multi-joint swing rod so that the ball head is in contact with the lead screw thread;

[0035] Third, adjust the angle of the swing rod so that the extension rod and the spring are compressed to ensure that the clamping ball head has a certain force with the thread, and lock the knob.

[0036] A measuring method using a lead screw lead instrument measuring head mechanism, comprising the following steps:​​

[0037] Fourth step: During measurement, the lead screw rotates, causing the locking ball head to move axially, which in turn pushes the follower frame and the measurement platform to move independently and synchronously, and drives the drag chain to unload the external force of the drag chain onto the measurement platform.

[0038] Fifth step, measurement complete, multi-joint pendulum retracts, locking ball head disengages from lead screw.

[0039] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A lead screw guide cable chain unloading mechanism, characterized in that: The device includes a multi-jointed swing arm, a locking ball head, a follower frame, a telescopic rod, a measuring head, rollers, and a cable chain. The multi-jointed swing arm is mounted on the follower frame and located to the side of the measuring head. The locking ball head is mounted on the telescopic rod, which is mounted on the multi-jointed swing arm. A compression spring is provided between the telescopic rod and the multi-jointed swing arm. The multi-jointed swing arm is mounted on the follower frame and locked by a knob. The rollers are mounted on the follower frame. A cable chain is mounted on the follower frame.

2. The lead screw guide cable chain unloading mechanism according to claim 1, characterized in that: The following frames are located outside the measurement platform and are independent and not connected to each other.

3. The lead screw guide cable chain unloading mechanism according to claim 1, characterized in that: The multi-joint swing arm includes a knob, a primary swing arm, and a secondary swing arm. The primary swing arm and the secondary swing arm are connected by a nested hinge, and the angle between the primary swing arm and the secondary swing arm is fixed by locking the knob.

4. The lead screw guide cable chain unloading mechanism according to claim 1, characterized in that: The follow-up frame includes a roller frame, a connecting plate, and rollers. The roller frame and the connecting plate form a closed frame and surround the measuring platform, with the rollers rolling on the guide rail.

5. The lead screw guide cable unloading mechanism according to claim 1, characterized in that: The follow-up frame is driven by the positioning ball head through a multi-joint swing arm.

6. The lead screw guide cable chain unloading mechanism according to claim 1, characterized in that: During operation, the positioning ball head and the measuring head simultaneously contact the lead screw thread.

7. A measurement method using the lead screw guide cable chain unloading mechanism according to any one of claims 1-6, characterized in that, The steps are as follows: First, select the appropriate diameter locking ball head according to the pitch and fix it on the multi-joint swing arm; second, adjust the multi-joint swing arm so that the locking ball head contacts the screw thread; third, adjust the angle of the multi-joint swing arm so that the telescopic rod and spring are compressed to ensure that there is a certain force between the locking ball head and the thread, and tighten the knob; fourth, during measurement, the screw rotates to drive the locking ball head to move axially, and pushes the follower frame and the measurement platform to move independently and synchronously, and drives the drag chain to unload the external force of the drag chain on the measurement platform; fifth, after the measurement is completed, the multi-joint swing arm retracts and the locking ball head disengages from the screw.

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