Detection tool for detecting parallelism of linear guide rail

Abstract

The utility model discloses a gauge for detecting the parallelism of a linear guide rail, which comprises a connecting rod, a bottom plate, a cushion block and a dial indicator, a positioning hole is arranged at the bottom of one end of the connecting rod, a plurality of screw holes for installing a plurality of screws are respectively arranged on the bottom plate and the cushion block, and the plurality of screws are used for respectively fixing the bottom plate and the cushion block at the tops of two linear guide rail slide blocks. The two linear rail sliding blocks are slidably installed on the two linear rails respectively, a positioning shaft is fixed to the top of the bottom plate and is in clearance fit with the positioning hole through a shaft hole, a vertical bearing plate is integrally arranged on one side of the bottom plate, one side face of the bearing plate is a vertical bearing face, and the bearing face is used for bearing the side faces of the linear rail sliding blocks fixed to the bottom plate. The cushion block is used for supporting the other end of the connecting rod, and the dial indicator is used for detecting the distance between the two linear guide rail sliding blocks at different positions. The detection tool provided by the utility model has the advantages of simple assembly, strong versatility, convenient operation, high-efficiency detection of the parallelism of the two linear rails, visual detection data and small error.

Description

Technical Field

[0001] The utility model relates to a fixture for detecting parallelism, in particular to a fixture for detecting the parallelism of linear guides. Background Art

[0002] The parallelism of linear guides is the basic accuracy of machine tools, and it is essential to detect the parallelism during on-site production and assembly. The existing methods for detecting the parallelism of linear guides are mainly the following two: 1) Horizontally place a straightedge in the middle of the linear guide, adsorb a dial indicator on the linear guide slider, and the dial indicator head detects the side surface (i.e., the precision surface) of the straightedge. Adjust the position of the straightedge to make the dial indicator data at both ends of the straightedge zero. Move the linear guide slider every 200 mm. First, record the data on one side, then keep the straightedge stationary, detect the data of the other linear guide and the straightedge, and finally process the data to obtain the parallelism of the two linear guides; 2) Directly adsorb the dial indicator on one side of the linear guide slider, the dial indicator head abuts against the side surface (i.e., the reference surface) of the linear guide slider on the other linear guide, zero the dial indicator, and then simultaneously push the two linear guide sliders to move. Read the dial indicator data in sequence every 200 mm, and the obtained data is the parallelism of the two linear guides.

[0003] Both of the above two measurement methods have certain disadvantages. When detecting by method 1), it is necessary to frequently adjust the position of the straightedge, which is troublesome to operate, takes a long time, and it is necessary to process the obtained data to draw a final conclusion after detection. The data is not intuitive and the detection result is affected by the accuracy of the straightedge itself. In addition, the length of the detected linear guide and the detection result are limited by the length of the straightedge. The longer the straightedge, the worse the parallelism of the two precision surfaces, resulting in a larger error; when detecting by method 2), one side of the dial indicator needs to extend out. The lateral elongation of the dial indicator will cause inaccurate data of the dial indicator head due to the too long force arm and the influence of gravity. In addition, the span of the two detected linear guides is also affected by the length of the dial indicator, resulting in a large error in the measurement result.

[0004] Parallelism is one of the important parameters of machine tools. It is often necessary to detect the parallelism of machine tool linear guides on-site to ensure the basic accuracy of the machine tool. The above existing methods for detecting the parallelism of linear guides greatly affect the detection efficiency and accuracy, resulting in an increase in the machine tool assembly cycle. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a fixture for detecting the parallelism of linear guides, which is simple to assemble, has strong versatility, is convenient to operate, can realize the high-efficiency detection of the parallelism of two linear guides, and has intuitive detection data and small error, aiming at the deficiencies of the prior art.

[0006] The technical solution adopted by the present utility model to solve the above technical problems is as follows: A fixture for detecting the parallelism of a linear guide rail, comprising a connecting rod, a bottom plate, a cushion block and a micrometer. A positioning hole is provided at the bottom of one end of the connecting rod. A plurality of screw holes for installing a plurality of screws are respectively provided on the bottom plate and the cushion block. The plurality of screws are used to respectively fix the bottom plate and the cushion block on the tops of two linear guide rail sliders. The two linear guide rail sliders are respectively slidably installed on two linear guide rails. A positioning shaft is fixed on the top of the bottom plate. The positioning shaft and the positioning hole are in clearance fit through a shaft hole. An upright bearing plate is integrally provided on one side of the bottom plate. One side surface of the bearing plate is a vertical bearing surface. The bearing surface is used to bear against the side surface of the linear guide rail slider fixed to the bottom plate. The cushion block is used to support the other end of the connecting rod. The micrometer is used to detect the distance between the two linear guide rail sliders at different positions.

[0007] The using steps of the fixture for detecting the parallelism of the linear guide rail of the present utility model are as follows: 1) Place the fixture on two to-be-detected linear guide rails that have been assembled, and then use screws to respectively fix the bottom plate and the cushion block on the two linear guide rail sliders. The side surface of the linear guide rail slider under the bottom plate needs to closely lean against the bearing surface, so as to fix the relative position between the bottom plate and the linear guide rail slider; 2) Make one end of the connecting rod in clearance fit with the shaft hole of the bottom plate, place the connecting rod on the bottom plate and the cushion block, and then adsorb the micrometer on the connecting rod. Take the side surface of the linear guide rail slider under the cushion block facing the bottom plate as the reference surface, and press the head of the micrometer against the reference surface. Then rotate the connecting rod with the positioning shaft as the rotation axis. When the reading of the micrometer is the maximum value, zero the data of the micrometer, and take the position where the two linear guide rail sliders are located at this time as the position of the minimum distance between the two linear guide rail sliders; 3) Push the two linear guide rail sliders simultaneously to drive the fixture to move to the next position, and then repeat the relevant operations in step 2) above, and record the maximum value of the micrometer reading. The difference between the maximum value of the micrometer reading and the maximum value of the micrometer reading in step 2) is the parallelism of the two linear guide rails at the two positions. Move the fixture at equal intervals multiple times and repeat the above operations to obtain the overall parallelism of the two linear guide rails.

[0008] The advantages of the fixture for detecting the parallelism of the linear guide rail of the present utility model are mainly reflected in:

[0009] 1. Strong versatility: The detection of the parallelism of the linear guide rail by this fixture is not limited by the length and span of the linear guide rail, and the length of the connecting rod can be adjusted according to the change of the span of the linear guide rail, and the parallelism of linear guide rails with any length and span can be detected;

[0010] 2. Strong operability: When using this inspection tool, only screw the base plate and the cushion block to the two linear guide sliders respectively, ensure that the side of the linear guide slider on the lower side of the base plate is closely attached to the bearing surface, place the connecting rod on the base plate and the cushion block, and cooperate with a dial indicator to detect the parallelism, which is convenient and fast.

[0011] 3. High detection efficiency: It can achieve high-efficiency detection of the parallelism of two linear guides.

[0012] 4. Intuitive detection data: During the use of this inspection tool, the operator can directly see the detected data results.

[0013] 5. Small error: The detection result of this inspection tool is not interfered and has a smaller error.

[0014] Preferably, first support plates and second support plates are respectively fixed to the bottoms of both ends of the connecting rod. The bottom surface of the first support plate is in surface contact with the top surface of the base plate. A through hole is opened on the first support plate. The positioning shaft passes through the through hole and is in clearance fit with the positioning hole through the shaft hole. The bottom surface of the second support plate is in surface contact with the top surface of the cushion block. The design of the first support plate and the second support plate can ensure the assembly accuracy of the connecting rod with the base plate and the cushion block, and ensure the detection accuracy of the parallelism.

[0015] Preferably, the bearing plate is arranged on one side of the base plate close to the cushion block.

[0016] Preferably, a plurality of waist-shaped holes are respectively opened on the base plate and the cushion block. The plurality of waist-shaped holes cooperate with a plurality of screw holes, which can improve the assembly accuracy of the base plate and the cushion block with the linear guide slider and meet the assembly requirements with linear guide sliders of different specifications.

[0017] Compared with the prior art, the present utility model has the following advantages: The inspection tool for detecting the parallelism of the linear guide of the present utility model is simple to assemble, has strong versatility, is convenient to operate, can achieve high-efficiency detection of the parallelism of two linear guides, and has intuitive detection data and small error. When using this inspection tool, only screw the base plate and the cushion block to the two linear guide sliders respectively, ensure that the side of the linear guide slider on the lower side of the base plate is closely attached to the bearing surface, place the connecting rod on the base plate and the cushion block, and cooperate with a dial indicator to detect the parallelism, which is convenient and fast. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is the external view of the inspection tool in the embodiment;

[0019] Figure 2 It is the longitudinal sectional view of the inspection tool in the embodiment;

[0020] Figure 3 It is the effect diagram after the inspection tool in the embodiment is assembled on the linear guide.

[0021] Figure 4 is the top view corresponding to Figure 3 ;

[0022] Figure 5 is the longitudinal sectional view corresponding to Figure 4 ;

[0023] Figure 6 is Figure 5 the enlarged view at position A in

[0024] The specific reference numerals in the figure are as follows:

[0025] 1 - connecting rod, 11 - positioning hole, 12 - first support plate, 13 - second support plate, 2 - bottom plate, 21 - positioning shaft, 22 - bearing plate, 23 - bearing surface, 24 - through hole, 3 - spacer block, 41 - screw hole, 42 - kidney-shaped hole, 51 - linear guide, 52 - linear guide slider Detailed implementation mode

[0026] The present utility model will be further described in detail below in conjunction with the embodiments of the drawings. The structures or components not defined in the present utility model all adopt the conventional technical means in the art.

[0027] The fixture for detecting the parallelism of the linear guide in the embodiment, as shown in Figure 1 and Figure 2 , includes a connecting rod 1, a bottom plate 2, a spacer block 3 and a micrometer (not shown in the figure). A positioning hole 11 is provided at the bottom of one end of the connecting rod 1. A plurality of screw holes 41 for installing a plurality of screws and a plurality of kidney-shaped holes 42 are respectively provided on the bottom plate 2 and the spacer block 3. The plurality of screws are used to fix the bottom plate 2 and the spacer block 3 to the tops of two linear guide sliders 52 respectively. The two linear guide sliders 52 are respectively slidably installed on two linear guides 51. A positioning shaft 21 is fixed to the top of the bottom plate 2. A vertical bearing plate 22 is integrally provided on one side of the bottom plate 2 close to the spacer block 3. One side surface of the bearing plate 22 is a vertical bearing surface 23. The bearing surface 23 is used to bear against the side surface of the linear guide slider 52 fixed to the bottom plate 2. The spacer block 3 is used to support the other end of the connecting rod 1. The micrometer is used to detect the distance between the two linear guide sliders 52 at different positions.

[0028] In this embodiment, first support plates 12 and second support plates 13 are respectively fixed to the bottoms of both ends of the connecting rod 1. The bottom surface of the first support plate 12 is in surface contact with the top surface of the bottom plate 2. A through hole 24 is provided on the first support plate 12. The positioning shaft 21 passes through the through hole 24 and is in clearance fit with the positioning hole 11 through the shaft hole. The bottom surface of the second support plate 13 is in surface contact with the top surface of the spacer block 3.

[0029] The effect diagram of the above fixture after being assembled on the linear guide is as shown in Figures 3 to 6 .

[0030] Taking the track to be measured with a 3-meter stroke as an example, the parallelism is detected by using the above-mentioned inspection tool, and the steps are as follows:

[0031] 1) Place the inspection tool on the two tracks to be measured that have been assembled, and then use screws to fix the bottom plate and the spacer block on the two track sliders respectively. The side of the track slider on the lower side of the bottom plate needs to be closely attached to the bearing surface, so as to fix the relative position of the bottom plate and the track slider;

[0032] 2) Make one end of the connecting rod have a clearance fit with the shaft hole of the bottom plate, place the connecting rod on the bottom plate and the spacer block, start the detection from one end of the two tracks, then adsorb the dial indicator on the connecting rod, take the side surface of the track slider on the lower side of the spacer block facing the bottom plate as the reference surface, press the head of the dial indicator against the reference surface, and then rotate the connecting rod with the positioning shaft as the rotation axis. When the reading of the dial indicator is the maximum value, zero the data of the dial indicator, and take the position where the two track sliders are located at this time as the minimum distance between the two track sliders, and mark the position of the two track sliders at this time as 0;

[0033] 3) Push the two track sliders simultaneously to drive the inspection tool to move 200 mm to the next position, and then repeat the relevant operations in step 2) above, and record the maximum value of the dial indicator reading. The difference between the maximum value of the dial indicator reading and the maximum value of the dial indicator reading in step 2) (i.e., the measured value) is the parallelism of the two tracks at the two positions, and mark the position of the two track sliders at this time as 200; Move the inspection tool at equal intervals of 200 mm multiple times and repeat the above operations, and mark the positions of the two track sliders when the dial indicator reading is the largest as 400, 600, 800,..., 3000 respectively;

[0034] 4) The data obtained from the above detection is as follows:

[0035] Position 0 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 3000 Measured value 0 0.005 0.008 0.01 0.008 0.004 0.009 0.01 0.006 0.008 0.01 0.012 0.007 0.006 0.005 0.007

[0036] As can be seen from the data in the above table, the reading at position 0 is the smallest, the reading at position 2200 is the largest, and the difference is 0.012. Then the parallelism of this group of tracks is 0.012 / full length. At the same time, it can also be found from the above data that the position 2200 is the closest distance between the two tracks, and the assembly accuracy of the tracks can also be corrected based on the above data.

[0037] For the track to be measured with a length of 10 meters, the time required to detect the parallelism by using the above-mentioned inspection tool is approximately:

[0038] 3 min (adjustment time) + 20 min (detection time) = 23 min;

[0039] When detecting the parallelism of the track by using method 1) in the background technology, the time required is approximately:

[0040] 30 min (adjustment time) + 10 min (hoisting) + 20 min (detection time) + 10 min (calculation time) = 70 min;

[0041] It can be seen that when the parallelism of a 10-meter-long rail to be measured is detected by using the inspection tool of the present utility model, the detection efficiency is improved compared with the method 1) in the background art: (70 - 23) / 70 = 67%.

Claims

1. A fixture for detecting the parallelism of linear guides, characterized in that It includes a connecting rod, a bottom plate, a cushion block and a dial indicator. A positioning hole is provided at the bottom of one end of the connecting rod. A number of screw holes for installing a number of screws are respectively provided on the bottom plate and the cushion block. The number of screws are used to respectively fix the bottom plate and the cushion block on the tops of two linear guide sliders. The two linear guide sliders are respectively slidably installed on two linear guides. A positioning shaft is fixed on the top of the bottom plate. The positioning shaft and the positioning hole are in clearance fit through a shaft hole. An upright supporting plate is integrally provided on one side of the bottom plate. One side surface of the supporting plate is a vertical supporting surface. The supporting surface is used to support the side surface of the linear guide slider fixed to the bottom plate. The cushion block is used to support the other end of the connecting rod. The dial indicator is used to detect the distance between the two linear guide sliders at different positions.

2. The gauge for detecting the parallelism of a linear guide according to claim 1, wherein First supporting plates and second supporting plates are respectively fixed to the bottoms of both ends of the connecting rod. The bottom surface of the first supporting plate is in surface contact with the top surface of the bottom plate. A through hole is provided on the first supporting plate. The positioning shaft passes through the through hole and is in clearance fit with the positioning hole through a shaft hole. The bottom surface of the second supporting plate is in surface contact with the top surface of the cushion block.

3. The gauge for detecting the parallelism of a linear guide according to claim 1, wherein, The supporting plate is arranged on one side of the bottom plate close to the cushion block.

4. A fixture for detecting the parallelism of a linear guide according to claim 1, wherein, A number of waist-shaped holes are respectively provided on the bottom plate and the cushion block.

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