A clamping device for measuring casing gap and its application

Abstract

The present invention discloses a clamping device for measuring casing gap and its application, the clamping unit comprises at least two supporting adjustment surfaces, which are arranged at intervals in front and back along the length direction of the pipe fitting, and all the supporting adjustment surfaces can be arranged to float up and down; at least one pressing surface is horizontal along its length direction and is configured to keep the pipe fitting horizontal after the pressing surface is in contact with the pipe fitting; the pressing surface is located between the two supporting adjustment surfaces at the front end and the rear end, and the pressing surface and the supporting adjustment surface are respectively located at the upper and lower sides of the pipe fitting; when the pipe fitting is clamped by the pressing surface and the supporting adjustment surface, the pressing surface presses the pipe fitting horizontally down on the supporting adjustment surface, and the supporting adjustment surface floats adaptively to keep the two ends of the pipe fitting always in the same horizontal line; the clamping device comprises a base, two sets of clamping mechanisms and two sets of the above-mentioned clamping units, and clamps the inner pipe and the outer pipe to keep the inner and outer pipes horizontal; the application is the steps of using the clamping device to clamp the inner and outer pipes.

Description

Technical Field

[0001] The invention relates to the field of furniture, in particular to the assembly of a lifting table, and more particularly to a clamping device for measuring a sleeve gap and an application thereof. Background Art

[0002] The legs of a lifting table are generally composed of an inner tube and an outer tube that are sleeved together to form a sleeve. The sleeve is extended and retracted to achieve the lifting and lowering of the lifting table. Therefore, factors that affect the extension and retraction of the sleeve will often also affect the lifting and lowering of the lifting table. These influencing factors include the impact of the gap between the inner tube and the outer tube on the extension and retraction and lifting.

[0003] There are many methods to measure the gap between the inner tube and the outer tube, which are mainly divided into direct gap measurement method and indirect measurement method; the indirect measurement method refers to measuring the inner diameter of the outer tube and the outer diameter of the inner tube respectively, so as to calculate the gap value; the direct gap measurement method refers to putting the inner tube and the outer tube together, so that the part of the inner tube located in the outer tube fits with the outer tube, and directly measuring the exposed gap; when directly measuring the gap, the inner tube and the outer tube need to be clamped, one is to ensure the stability of the two, and the other is to ensure that the two are partially fitted, so that the exposed gap is the gap that exists in the actual use state, that is, the center lines of the two need to be kept parallel.

[0004] If the center lines of the inner and outer tubes are skewed, and one end of the inner tube is tilted, the validity of the gap value will be affected: the reference plane of the clamping device is generally horizontal, but due to the wall thickness of the outer tube, when the inner tube and the outer tube are located on the same horizontal reference plane at the same time, the inner tube has a height difference due to the wall thickness of the outer tube, and the inner tube is tilted. The part of the inner tube in the outer tube is higher, and the part exposed to the outer tube is lower, thereby affecting the validity of the gap value; therefore, in response to this problem, the manufacturer has set up two reference planes with a height difference to support the inner tube and the outer tube respectively, but it is difficult to set up such two fixed reference planes, and high precision is required. In addition, after the pipe fittings are sprayed, the flatness of their outer surface is difficult to guarantee, and there are bumps at different positions, which will affect their horizontal situation during clamping; in addition, two reference planes with a single height difference cannot adapt to pipe fittings with different wall thicknesses. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a clamping device for measuring the gap between casings, which mainly functions by two sets of clamping units. The clamping units clamp the pipe fittings by means of upper and lower support adjustment surfaces and pressure surfaces, and the pipe fittings can be leveled after the pressure surfaces are fitted with the pipe fittings, and the floating ability of the support adjustment surfaces can compensate for the influence of the uneven outer wall of the pipe fittings, and the pressure surfaces and the support adjustment surfaces cooperate with each other, so that the pipe fittings are finally kept in a stable horizontal state when clamped; the two sets of clamping units respectively keep the clamped inner tube and outer tube in a horizontal state, and at the same time, the two sets of clamping units cooperate with each other, so that the part of the inner tube located in the outer tube can fit smoothly and fitly on the inner wall of the outer tube, compensating for the influence of the height difference formed by the wall thickness of the outer tube on the fitting of the two tubes, and at the same time, due to the floating property of the floating seat, the clamping device can also adapt to pipe fittings with different wall thicknesses.

[0006] Further provided is an application of a clamping device, which is used to clamp the inner tube and outer tube that are sleeved together, and the tube is clamped or released by raising and lowering the pressure head. When the tube is clamped, the floating seat floats accordingly to level the tube, and finally the extended section of the inner tube can fit with the inner wall of the outer tube, thereby exposing the gap to be measured. Moreover, the application process is simple and fast, and the gap data obtained is more reliable.

[0007] The technical solution of the present invention is achieved in this way:

[0008] A clamping unit for measuring casing gap, comprising:

[0009] At least two support adjustment surfaces are arranged at intervals in the front and rear direction along the length direction of the pipe, and all the support adjustment surfaces can be arranged to float up and down;

[0010] At least one pressing surface is horizontal along its length and is configured to keep the pipe fitting horizontal after the pressing surface is attached to the pipe fitting; the pressing surface is located between the two supporting adjustment surfaces at the front end and the rear end, and the pressing surface and the supporting adjustment surface are located at the upper and lower sides of the pipe fitting respectively;

[0011] When the pipe fitting is clamped by the pressing surface and the supporting adjustment surface, the pressing surface presses the pipe fitting horizontally down onto the supporting adjustment surface, and the supporting adjustment surface floats adaptively to keep the two ends of the pipe fitting always on the same horizontal line.

[0012] The pipe fitting is clamped by the upper and lower supporting adjustment surfaces and the pressing surface, and the pipe fitting can be leveled after the pressing surface is in contact with the pipe fitting, and the floating ability of the supporting adjustment surface can compensate for the impact of the uneven outer wall of the pipe fitting. The pressing surface and the supporting adjustment surface cooperate with each other, and ultimately the pipe fitting is always stably maintained in a horizontal state when clamped; the position of the pressing surface is between the two supporting adjustment surfaces at the front end and the rear end, so that the pressing surface will not press on the front end or the rear end of the pipe fitting to cause the entire pipe fitting to tilt up.

[0013] Preferably, the cross-sectional contours of the support adjustment surface and the pressing surface are both in line with the outer contour of the pipe fitting, and the support adjustment surface and the pressing surface are both horizontal along the extension direction of the cross-sectional contour. In general, the shapes of the support adjustment surface and the pressing surface should match the shapes of the pipe fitting, so that the support adjustment surface and the pressing surface can fit together; there are also cases where the shapes do not match, but the cross-sectional contours of the support adjustment surface and the pressing surface can still fit together with the outer contour of the pipe fitting, such as when the cross-sectional contours of the support adjustment surface and the pressing surface are V-shaped, and the pipe fitting is a round tube, and the round tube is between the two surfaces of the V-shape, with a total of four linear contacts, but the pipe fitting can still remain stable between the support adjustment surface and the pressing surface; the fit at this time is not a complete fit, but it is the same as a complete fit, and it plays a role in stabilizing the pipe fitting; a surface can be regarded as an extension of a cross-sectional contour line, so the support adjustment surface and the pressing surface remain horizontal as a whole, and the pipe fitting that fits with it will naturally remain horizontal as well.

[0014] Preferably, the cross-sectional profiles of the support adjustment surface and the pressing surface are both V-shaped, and the support adjustment surface and the pressing surface are configured to fit both round tubes and square tubes. The situation when the round tube fits with the V-shaped support adjustment surface and the pressing surface is as described above; when the cross-sectional profiles of the support adjustment surface and the pressing surface are both V-shaped, one of the diagonals of the square tube is vertically located between the support adjustment surface and the pressing surface.

[0015] Preferably, when the pipe is a round tube, the support adjustment surface and the pressing surface are both arc surfaces, and the central axes of the support adjustment surface and the pressing surface are always kept horizontal. The arc surface can naturally fit the round tube; the central axes of the support adjustment surface and the pressing surface are horizontal, and when the round tube fits, they can also remain horizontal.

[0016] Preferably, when the pipe is a square tube, the cross-sectional profiles of the support adjustment surface and the pressure surface are both U-shaped. When the cross-sectional profiles of the support adjustment surface and the pressure surface are both U-shaped, the lowermost outer wall of the square tube fits with the support adjustment surface, and the uppermost outer wall fits with the pressure surface.

[0017] A clamping device for measuring casing gaps, comprising a base, two sets of clamping mechanisms and two sets of the above-mentioned clamping units; the base is configured as the main body support of the device, the two sets of clamping mechanisms are used to clamp an inner tube and an outer tube respectively, and the two sets of clamping mechanisms are both arranged on the base; each clamping mechanism comprises at least one pressure head and at least two sets of supporting components, the supporting components are arranged at intervals along the length direction of the base and are used to support the tube, the pressure head is located between the two supporting components at the front end and the rear end and is configured to be driven by a power unit to press or loosen the tube in the vertical direction; the supporting component comprises a fixed seat And a floating seat, the fixed seat is fixedly installed on the base, the floating seat is sleeved on the fixed seat and has the mobility to float up and down relative to the fixed seat; the floating seat is provided with a receiving groove adapted to the shape of the pipe fitting, and the pressure head is also provided with a clamping groove adapted to the shape of the pipe fitting; the pressing surface is formed on the groove wall of the clamping groove of the pressure head, and the supporting adjustment surface is formed on the groove wall of the receiving groove of the floating seat; when the inner tube and the outer tube are partially sleeved together and clamped by two clamping mechanisms respectively, the floating seat supporting the inner tube is higher than the floating seat supporting the outer tube and the height difference between the two is the wall thickness of the outer tube, so that the inner tube and the outer tube are kept horizontal and close to each other.

[0018] The two sets of clamping units of the clamping device are respectively arranged on the two sets of clamping mechanisms. The two sets of clamping mechanisms serve as the working basis and are played by the two sets of clamping units. When the pipe fitting is located in the accommodating groove of the floating seat and the clamping groove of the pressure head, the two sets of clamping units respectively keep the clamped inner pipe and outer pipe in a horizontal state. At the same time, the two sets of clamping units cooperate with each other so that the part of the inner pipe located in the outer pipe can fit smoothly and fitly on the inner wall of the outer pipe, compensating for the influence of the height difference caused by the wall thickness of the outer pipe on the fitting of the two pipes. At the same time, due to the floating property of the floating seat, the clamping device can also adapt to pipe fittings with different wall thicknesses.

[0019] Preferably, the movement direction of the pressure head is perpendicular to the horizontal plane, that is, the pressure head is lifted and lowered vertically to ensure that the inner tube part and the outer tube are in close contact with each other in the vertical direction; further, a gap is left between the inner tube and the outer tube in the vertical direction.

[0020] Preferably, the shape of the accommodating groove matches the shape of the supporting and adjusting surface, and the shape of the clamping groove matches the shape of the pressing surface.

[0021] Preferably, the fixed seat is vertically arranged on the base, the floating seat is provided with a sliding groove in the vertical direction, the floating seat is sleeved on the fixed seat and the fixed seat is located in the sliding groove. The floating seat and the fixed seat slide relative to each other, which not only determines the position of the floating seat but also provides a basis for the floating performance of the floating seat.

[0022] As a preferred embodiment, the fixed seat and the floating seat are both arranged along the width direction of the base, and springs are arranged below the left and right ends of the floating seat. The springs are located between the floating seat and the base and act on the floating seat, so that the floating seat has an upward elastic force. When the floating seat is subjected to a force from top to bottom, the floating seat and the fixed seat slide relative to each other. The elastic force of the spring enables the floating seat to float; it also enables the floating seat and the pressure seat to jointly stabilize the pipe fitting when clamping the pipe fitting.

[0023] Preferably, a limit pin is provided on the fixed seat, which protrudes front and back from the fixed seat, and a waist-shaped limit hole is correspondingly opened on the floating seat, in which the limit pin is inserted. When the floating seat and the fixed seat slide relative to each other, the position of the limit pin in the limit hole also changes synchronously, and the limit pin and the limit hole jointly limit the excessive floating of the floating seat and prevent the floating seat from separating from the fixed seat.

[0024] Preferably, the center lines of the support adjustment surfaces on all floating seats are in the same straight line; the center lines of the pressure surfaces on all pressure heads are also in the same straight line; the center lines of the support adjustment surfaces and the pressure surfaces are in the same vertical plane. The center lines of the support adjustment surfaces on all floating seats and the pressure surfaces on all pressure heads are in the same straight line to ensure that the inner tube and the outer tube are in the same straight line without lateral deviation; the center lines of the support adjustment surfaces and the pressure surfaces are in the same vertical plane to ensure that the pipe fittings can be clamped smoothly, and the directions of the two applying force to the pipe fittings are always kept vertical, thereby maintaining the stability of the pipe fittings when being clamped.

[0025] Preferably, the power unit is an electric push rod, a hydraulic rod or a cylinder.

[0026] An application of a clamping device, using the clamping device to clamp a casing, the casing is formed by partially sleeved inner and outer tubes, the portion of the inner tube located in the outer tube is the insertion section, and the portion of the inner tube exposed from the outer tube is the exposure section; the clamping device includes a preparatory state and a working state, in which the pressure head rises to a maximum height to allow the casing to enter the clamping device; in the working state, the pressure head descends and presses the pipe fitting on the floating seat to clamp the pipe fitting; the steps are:

[0027] S1. Pre-installed casing: the clamping device is in a ready state. When the casing is placed on the clamping device, the outer tube is supported by one set of the supporting components, and the exposed section of the inner tube is supported by another set of supporting components. The exposed section of the inner tube and the outer tube are both located in the receiving groove of the floating seat and fit the support adjustment surface. At this time, the outer tube and the inner tube are in a floating state with the floating seat.

[0028] S2. Clamping the casing: The clamping device enters the working state, controls the power unit to drive the pressure head to descend, and the pressure surfaces of the two pressure heads are respectively in contact with the exposed section of the inner tube and the outer tube, and the pressure heads continue to descend. The outer tube and the inner tube are lowered a certain distance together with the floating seat to ensure that the pressure head and the floating seat clamp the pipe fitting; at this time, the outer tube and the inner tube are both in a horizontal state;

[0029] S3, fitting the pipe fitting: the pressure head located above the exposed section of the inner pipe continues to descend until the inserted section fits downwardly against the inner wall of the outer pipe; during this process, the inner pipe and the outer pipe always remain in a horizontal state.

[0030] The clamping device is used to clamp the inner tube and the outer tube that are sleeved together. The pipe fitting is clamped or released by raising and lowering the pressure head. When the pipe fitting is clamped, the floating seat floats accordingly to level the pipe fitting, and finally the extended section of the inner tube can fit with the inner wall of the outer tube, thereby exposing the gap to be measured. In addition, the application process is simple and fast, and the gap data obtained is more reliable. In step S2, in order to ensure that the pressure head and the floating seat do clamp the pipe fitting, that is, the pipe fitting is always subjected to the force applied by the pressure head or the floating seat, even after the pressure surface on the pressure head fits with the pipe fitting, the pressure head continues to descend to make the inner tube descend a certain distance together with the floating seat. The certain distance is preset, and the specific distance is not important. What is important is that the above-mentioned effect is achieved after descending this distance. The optional range of the certain distance is 0.1-2cm.

[0031] Preferably, the floating seat has an upward elastic force. In step S2, the floating seat with elastic force lifts the pipe upward so that the pipe fits the pressing surface and the supporting adjustment surface. The floating seat has an upward elastic force due to the spring. The pressure head presses the pipe downward and remains motionless, so no pressure is applied to the pipe. The floating seat always applies an upward elastic force to the pipe due to the presence of the spring, thereby stably clamping the pipe.

[0032] Preferably, in step S3, the length of the outer wall of the insertion section and the inner wall of the outer tube are equal to the length of the insertion section, that is, the entire insertion section is in contact with the outer tube, and the contact between the two is sufficiently tight, so that the gap generated is sufficiently effective and reliable.

[0033] Preferably, the method further includes step S3-1, measuring the gap: after the lower portion of the insertion section is fitted with the inner wall of the outer tube, at least one gap required to be measured is formed between the upper portion of the insertion section and the inner wall of the outer tube, and the gap is measured and the size of the gap is recorded.

[0034] Preferably, the inner tube and the outer tube are both square tubes. In step S3-1, one of the diagonals of the inner tube is vertical and coincides with one of the diagonals of the outer tube. The diagonal of the lowermost end of the exposed section and the two outer walls forming the diagonal fit with the corresponding support adjustment surface, and the diagonal of the lowermost end of the outer tube and the two outer walls forming the diagonal fit with the corresponding support adjustment surface; the diagonal of the lowermost end of the inserted section and the two outer walls forming the diagonal fit with the diagonal of the lowermost end of the outer tube and the two inner walls forming the diagonal, and accordingly, the gaps required to be measured for the two sections are formed between the two outer walls of the upper part of the inserted section and the two inner walls of the upper part of the outer tube. Generally speaking, two gaps need to be measured for square tubes, and this method can measure the two gaps of square tubes at one time, and the measurement operation is convenient and quick.

[0035] Preferably, both the inner tube and the outer tube are square tubes. In step S3-1, the outer wall of the lowermost end of the exposed section fits with the corresponding support adjustment surface, and the outer wall of the lowermost end of the outer tube fits with the corresponding support adjustment surface; the outer wall of the lowermost end of the extended section fits with the inner wall of the lowermost end of the inner tube, and accordingly, a gap required to be measured in the first section is formed between the outer wall of the uppermost end of the extended section and the inner wall of the uppermost end of the outer tube; the power unit is controlled to drive the pressure head to rise to loosen the inner tube and the outer tube, and the inner tube and the outer tube are flipped 90° and clamped again, and the gap required to be measured in the second section is obtained in the same way.

[0036] Preferably, both the inner tube and the outer tube are circular tubes, the lowermost end of the outer wall of the insertion section is tangent to the inner wall of the outer tube, and in the vertical direction, a gap required for measurement is formed between the uppermost end of the outer wall of the insertion section and the uppermost end of the inner wall of the outer tube.

[0037] Preferably, in step S3-1, a feeler gauge is used to measure the gap between the inner tube and the outer tube.

[0038] Preferably, in step S3-1, a laser measuring instrument is used to measure the gap between the inner tube and the outer tube.

[0039] The design starting point, concept and beneficial effects of the present invention using the above technical solution are:

[0040] 1. The pipe fitting is clamped by the upper and lower support adjustment surfaces and the pressing surface. The pressing surface can make the pipe fitting level after it is attached to the pipe fitting. The floating ability of the support adjustment surface can compensate for the impact of the uneven outer wall of the pipe fitting. The pressing surface and the support adjustment surface cooperate with each other, so that the pipe fitting is always stably kept in a horizontal state when clamped. The position of the pressing surface is between the two support adjustment surfaces at the front end and the rear end, so that the pressing surface will not press the front end or the rear end of the pipe fitting to cause the entire pipe fitting to tilt up.

[0041] 2. The two sets of clamping units of the clamping device are respectively arranged on the two sets of clamping mechanisms. The two sets of clamping mechanisms serve as the working basis and are played by the two sets of clamping units. When the pipe fitting is located in the accommodating groove of the floating seat and the clamping groove of the pressure head, the two sets of clamping units respectively keep the clamped inner pipe and outer pipe in a horizontal state. At the same time, the two sets of clamping units cooperate with each other so that the part of the inner pipe located in the outer pipe can fit smoothly and fitly on the inner wall of the outer pipe, compensating for the influence of the height difference caused by the wall thickness of the outer pipe on the fitting of the two pipes. At the same time, due to the floating property of the floating seat, the clamping device can also adapt to pipe fittings with different wall thicknesses.

[0042] 3. Use the above-mentioned clamping device to clamp the inner tube and the outer tube that are sleeved together, and clamp or release the pipe fitting by raising and lowering the pressure head. When clamping the pipe fitting, the floating seat floats accordingly to level the pipe fitting, and finally the extended section of the inner tube can fit with the inner wall of the outer tube, thereby exposing the gap to be measured, and the application process is simple and fast, and the gap data obtained is more reliable; in step S2, in order to ensure that the pressure head and the floating seat do clamp the pipe fitting, that is, the pipe fitting is always subjected to the force applied by the pressure head or the floating seat, even after the pressure surface on the pressure head fits with the pipe fitting, the pressure head continues to descend to make the inner tube descend a certain distance together with the floating seat; the certain distance is preset, and the specific distance is not important. What is important is that the above-mentioned effect is achieved after descending this distance. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 is a schematic diagram of the clamping unit in Example 1 of the present invention;

[0044] Figure 2 It is a schematic diagram of the three-dimensional structure of the casing measuring device in Example 1 of the present invention;

[0045] Figure 3 It is a front view of the casing measuring device in Example 1 of the present invention;

[0046] Figure 4 This is a flow chart of the application of the present invention in Example 1;

[0047] Figure 5 This is a schematic diagram of the three-dimensional structure of the inner tube and the outer tube placed in the device in Example 1 of the present invention;

[0048] Figure 6 This is a front view of the device in which the inner tube and the outer tube are placed in Example 1 of the present invention;

[0049] Figure 7 It is a schematic diagram of the three-dimensional structure in which the floating seat sleeve is arranged outside the fixed seat in Example 1 of the present invention;

[0050] Figure 8 It is a schematic diagram of the three-dimensional structure of the floating seat in Example 1 of the present invention;

[0051] Fig. 9 It is a schematic diagram of the three-dimensional structure of the fixing base in Example 1 of the present invention;

[0052] Fig.10 Schematic diagram of the three-dimensional structure of the feeler gauge in Example 1 of the present invention;

[0053] Fig.11 It is a front view of the device in Example 2 of the present invention;

[0054] Fig.12 It is a front view of the device in which the inner tube and the outer tube are placed in Example 2 of the present invention and the supporting adjustment surface and the pressing surface are both cambered surfaces;

[0055] Fig.13 This is a front view of the device in which the inner tube and the outer tube are placed in Example 2 of the present invention and the cross-sectional profiles of the supporting adjustment surface and the pressing surface are V-shaped.

[0056] The reference numerals of the figures are as follows: inner tube 1; extending section 101; exposed section 102; inner long side tube wall 103; inner short side tube wall 104; outer tube 2; outer long side tube wall 201; outer short side tube wall 202; base 3; switch 4; pressure head 5; clamping groove 51; supporting assembly 6; fixed seat 7; avoidance groove 71; floating seat 8; accommodating groove 9; sliding groove 10; spring 11; limiting hole 12; short side gap 13; long side gap 14; sliding seat 15; cylinder 16; feeler gauge 17; scale section 18; bracket 19; support adjustment surface 20; pressing surface 21. DETAILED DESCRIPTION

[0057] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0058] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0059] In the description of the present invention, the term "at least one" refers to one or more than one, unless otherwise clearly defined. The terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0060] The specific implementation of the present invention is as follows:

[0061] Embodiment 1: The pipe fitting is a square tube, specifically a rectangular tube, that is, the inner tube 1 and the outer tube 2 of the casing are both rectangular tubes.

[0062] like Figure 1 As shown, the present invention provides a clamping unit for measuring casing gap, comprising:

[0063] At least two support adjustment surfaces 20 are arranged at intervals in the front and rear direction along the length direction of the pipe, and all the support adjustment surfaces 20 can be arranged to float up and down;

[0064] At least one pressing surface 21 is horizontal along its length direction and is configured to keep the pipe fitting horizontal after the pressing surface 21 is attached to the pipe fitting; the pressing surface 21 is located between the two supporting and adjusting surfaces 20 at the front end and the rear end, and the pressing surface 21 and the supporting and adjusting surface 20 are located at the upper and lower sides of the pipe fitting respectively;

[0065] When the pipe is clamped by the pressing surface 21 and the supporting and adjusting surface 20, the pressing surface 21 presses the pipe horizontally down on the supporting and adjusting surface 20, and the supporting and adjusting surface 20 floats adaptively to keep the two ends of the pipe always on the same horizontal line.

[0066] The pipe fitting is clamped by the upper and lower supporting adjustment surfaces 20 and the pressing surface 21, and the pressing surface 21 can make the pipe fitting level after being attached to the pipe fitting, and then the floating ability of the supporting adjustment surface 20 can compensate for the impact of the uneven outer wall of the pipe fitting. The pressing surface 21 and the supporting adjustment surface 20 cooperate with each other, and finally the pipe fitting is always stably kept in a horizontal state when clamped; the position of the pressing surface 21 is between the two supporting adjustment surfaces 20 at the front end and the rear end, so that the pressing surface 21 will not press on the front end or the rear end of the pipe fitting to cause the entire pipe fitting to tilt up.

[0067] The cross-sectional profiles of the support adjustment surface 20 and the pressing surface 21 are in line with the outer contours of the inner tube 1 and the outer tube 2 of the rectangular tube, and the support adjustment surface 20 and the pressing surface 21 are both horizontal along the extension direction of the cross-sectional profile. A surface can be regarded as an extension of a cross-sectional profile line. Therefore, the support adjustment surface 20 and the pressing surface 21 are kept horizontal as a whole, and the square tube fitted therewith will naturally remain horizontal. Since the pipe fitting is a rectangular tube, the cross-sectional profiles of the support adjustment surface 20 and the pressing surface 21 can be evenly It is V-shaped, or can be both U-shaped; when the cross-sectional profiles of the support adjustment surface 20 and the pressing surface 21 are both U-shaped, the lowermost outer wall of the square tube is in contact with the support adjustment surface 20, and the uppermost outer wall is in contact with the pressing surface 21; when the cross-sectional profiles of the support adjustment surface 20 and the pressing surface 21 are both V-shaped, one of the diagonals of the square tube is vertically located between the support adjustment surface 20 and the pressing surface 21; in this embodiment, V-shaped support adjustment surface 20 and pressing surface 21 are selected, specifically, the V-shape is a right-angled V-shape.

[0068] like Figure 2 , 3As shown, a clamping device for measuring the casing gap is provided, comprising a base 3, two sets of clamping mechanisms (not shown) and two sets of the above-mentioned clamping units; the base 3 is configured as the main support of the device, the two sets of clamping mechanisms are used to clamp the inner tube 1 and the outer tube 2 respectively, and the two sets of clamping mechanisms are arranged on the base 3; each clamping mechanism comprises at least one pressure head 5 and at least two sets of supporting components 6, the supporting components 6 are arranged at intervals along the length direction of the base 3 and are used to support the pipe fittings, the pressure head 5 is located between the two supporting components 6 at the front end and the rear end and is configured to be driven by a power unit to press or loosen the pipe fittings in the vertical direction; the supporting component 6 comprises a fixing seat 7 with a fixing seat 7 and ... And a floating seat 8, a fixed seat 7 is fixedly installed on the base 3, the floating seat 8 is sleeved on the fixed seat 7 and has the mobility of floating up and down relative to the fixed seat 7; the floating seat 8 is provided with a receiving groove 9 adapted to the shape of the pipe fitting, and the pressure head 5 is also provided with a clamping groove 51 adapted to the shape of the pipe fitting; the pressing surface 21 is formed on the groove wall of the clamping groove 51 of the pressure head 5, and the supporting adjustment surface 20 is formed on the groove wall of the receiving groove 9 of the floating seat 8; when the inner tube 1 and the outer tube 2 are partially sleeved together and clamped by two clamping mechanisms respectively, the floating seat 8 supporting the inner tube 1 is higher than the floating seat 8 supporting the outer tube 2 and the height difference between the two is the wall thickness of the outer tube 2, so that the inner tube 1 and the outer tube 2 are both kept horizontal and close to each other.

[0069] The two sets of clamping units of the clamping device are respectively arranged on the two sets of clamping mechanisms. The two sets of clamping mechanisms serve as the working basis and are played by the two sets of clamping units. When the pipe fitting is located in the accommodating groove 9 of the floating seat 8 and the clamping groove 51 of the pressure head 5, the two sets of clamping units respectively keep the clamped inner tube 1 and the outer tube 2 in a horizontal state. At the same time, the two sets of clamping units cooperate with each other so that the part of the inner tube 1 located in the outer tube 2 can fit smoothly and fitly on the inner wall of the outer tube 2, compensating for the influence of the height difference caused by the wall thickness of the outer tube 2 on the fitting of the two tubes. At the same time, due to the floating property of the floating seat 8, the clamping device can also adapt to pipe fittings with different wall thicknesses.

[0070] like Figure 4 As shown, an application of a clamping device is further provided. The above-mentioned clamping device is used to clamp a casing. The casing is formed by partially sleeved together an inner tube 1 and an outer tube 2. The portion of the inner tube 1 located in the outer tube 2 is an insertion section 101, and the portion of the inner tube 1 exposed from the outer tube 2 is an exposure section 102. The clamping device includes a preparatory state and a working state. In the preparatory state, the pressure head 5 rises to a maximum height to allow the casing to enter the clamping device. In the working state, the pressure head 5 descends and presses the pipe fitting on the floating seat 8 to clamp the pipe fitting. The steps are:

[0071] S1. Pre-installed sleeve: The clamping device is in a ready state. When the sleeve is placed on the clamping device, the outer tube 2 is supported by one set of the supporting components 6, and the exposed section 102 of the inner tube 1 is supported by the other set of supporting components 6. The exposed section 102 of the inner tube 1 and the outer tube 2 are both located in the receiving groove 9 of the floating seat 8 and fit the support adjustment surface 20. At this time, the outer tube 2 and the inner tube 1 are in a floating state with the floating seat 8.

[0072] S2. Clamping the casing: The clamping device enters the working state, controls the power unit to drive the pressure head 5 to descend, and the pressure surfaces 21 of the two pressure heads 5 are respectively in contact with the exposed section 102 of the inner tube 1 and the outer tube 2, and the pressure heads 5 continue to descend, and the outer tube 2 and the inner tube 1 are lowered a certain distance together with the floating seat 8 to ensure that the pressure head 5 and the floating seat 8 clamp the pipe fitting; at this time, the outer tube 2 and the inner tube 1 are both in a horizontal state;

[0073] S3. Fitting the pipe fitting: the pressure head 5 located above the exposed section 102 of the inner pipe 1 continues to descend until the inserted section 101 fits downwardly against the inner wall of the outer pipe 2; during this process, the inner pipe 1 and the outer pipe 2 always remain in a horizontal state.

[0074] The clamping device is used to clamp the inner tube 1 and the outer tube 2 that are sleeved together. The pipe fitting is clamped or released by raising and lowering the pressure head 5. When clamping the pipe fitting, the floating seat 8 floats accordingly to level the pipe fitting, and finally the extending section 101 of the inner tube 1 can fit with the inner wall of the outer tube 2, thereby exposing the gap to be measured. In addition, the application process is simple and fast, and the gap data obtained is more reliable. In step S2, in order to ensure that the pressure head 5 and the floating seat 8 do clamp the pipe fitting, that is, the pipe fitting is always subjected to the force applied by the pressure head 5 or the floating seat 8, even after the pressure surface 21 on the pressure head 5 fits with the pipe fitting, the pressure head 5 continues to descend to make the inner tube 1 descend a certain distance together with the floating seat 8. The certain distance is preset, and the specific distance is not important. What is important is that the above-mentioned effect is achieved after descending this distance.

[0075] Specifically, the device also includes a switch 4, the base 3 is a plate-shaped member and is configured as the main body support of the device, the switch 4 and the clamping mechanism are both arranged on the base 3; the two sets of clamping mechanisms are used to clamp the inner tube 1 and the outer tube 2 respectively, and the switch 4 controls the clamping mechanism to clamp or loosen the pipe by controlling the power element (the power element is a cylinder 16); each set of clamping mechanisms includes a pressure head 5 and two sets of supporting components 6, and correspondingly, each set of clamping units includes a pressure surface 21 and two supporting adjustment surfaces 20, and the shape of the accommodating groove 9 is similar to that of the supporting groove 9. The shape of the support adjustment surface 20 matches, and the shape of the clamping groove 51 matches the shape of the pressing surface 21; the pressure head 5 is located between the two sets of supporting components 6 and is located at a height higher than the supporting components 6, so as to be used to press or loosen the pipe fittings from top to bottom, so that the clamping mechanism clamps or loosens the pipe fittings; four sets of supporting components 6 are arranged on the base 3 in sequence along the length direction of the base 3 (i.e., the front and rear direction); a accommodating groove 9 adapted to the shape of the pipe fitting is provided on the floating seat 8, the inner tube 1 and the outer tube 2 are both placed on the floating seat 8 and the lower ends of the two pipe fittings are diagonally located in the accommodating groove 9.

[0076] Specifically, if Figure 7-9 As shown, the fixed seat 7 is a plate member vertically arranged on the base 3, and the floating seat 8 is provided with a sliding groove 10 in the vertical direction. The floating seat 8 is sleeved on the fixed seat 7 and the fixed seat 7 is located in the sliding groove 10; the fixed seat 7 and the floating seat 8 are both arranged along the width direction (left-right direction) of the base 3, and springs 11 are provided below the left and right ends of the floating seat 8. The spring 11 is located between the floating seat 8 and the base 3 and acts on the floating seat 8, so that the floating seat 8 has an upward elastic force F. When the floating seat 8 is subjected to a force from top to bottom, the floating seat 8 and the fixed seat 7 slide relative to each other; a limit pin (not shown) is provided on the fixed seat 7, and the limit pin protrudes from the fixed seat 7 front and back. A waist-shaped limit hole 12 is correspondingly provided on the floating seat 8, and the limit pin is inserted in the limit hole 12. When the floating seat 8 and the fixed seat 7 slide relative to each other When the position of the limit pin in the limit hole 12 is changed synchronously, the limit pin and the limit hole 12 jointly limit the floating seat 8 from floating excessively and prevent the floating seat 8 from detaching from the fixed seat 7; the accommodating groove 9 is a right-angle notch, and the accommodating groove 9 is different according to the shape of different pipe fittings, but when the pipe fitting is placed in the accommodating groove 9, one of the diagonals of the pipe fitting is vertical, such as when the pipe fitting is a square pipe, the angles between the two groove walls of the accommodating groove 9 and the vertical direction are both 45°, and one diagonal of the square pipe is vertical; when the pipe fitting is a rectangular pipe, the right angle of the accommodating groove 9 will also be inclined accordingly, and one diagonal of the rectangular pipe will be vertical; therefore, in step S1, the outer pipe 2 and the inner pipe 1 can lie flat on the floating seat 8 with the diagonals vertical; the fixed seat 7 is also provided with a corresponding avoidance groove 71 with the same shape as the accommodating groove 9 to avoid the pipe fitting. In this embodiment, the shape of the pipe fitting is a rectangular pipe.

[0077] In addition, the center lines of the support adjustment surfaces 20 on all floating seats 8 are in the same straight line; the center lines of the pressing surfaces 21 on all the pressing heads 5 are also in the same straight line; the center lines of the support adjustment surfaces 20 and the pressing surfaces 21 are in the same vertical plane; the center lines of the support adjustment surfaces 20 on all floating seats 8 and the center lines of the pressing surfaces 21 on all the pressing heads 5 are also in the same straight line to ensure that the inner tube 1 and the outer tube 2 are in the same straight line without lateral displacement; the center lines of the support adjustment surfaces 20 and the pressing surfaces 21 are in the same vertical plane, ensuring that the pipe fittings can be clamped smoothly, and the directions of the forces applied to the pipe fittings by both are always kept vertical, thereby maintaining the stability of the pipe fittings when being clamped.

[0078] The two sets of clamping mechanisms work together to make the inner tube 1 fit with the outer tube 2 at the bottom, leaving a gap at the top; specifically, each set of clamping mechanisms has three contact points with the pipe fitting. Taking the clamping of the outer tube 2 as an example, the outer tube 2 is placed flat on two supporting components 6, and the center line of the outer tube 2 is arranged along the length direction of the base 3. The two supporting components 6 support the two end portions of the outer tube 2 in the length direction, and the pressure head 5 is located in the middle position of the outer tube 2 in the length direction; in step S2, the floating seat 8 provides an elastic force F for the outer tube 2, and the pressure head 5 is controlled by the switch 4 to give the outer tube 2 a pressure Fn. The outer tube 2 is clamped by the pressure head 5 and the floating seat 8 so that the pipe fitting fits the pressing surface 21 and the support adjustment surface 20, and due to the floating ability of the floating seat 8, the two ends of the outer tube 2 can be The ends are kept in the same straightness, so that the outer tube 2 is in a horizontal lying state; similarly, the inner tube 1 is also clamped by the pressure head 5 and the floating seat 8, and the inner tube 1 is in a horizontal lying state; and because the inner tube 1 is smaller than the outer tube 2, and the insertion section 101 of the inner tube 1 is inserted into the outer tube 2, the pressure Fn applied to the inner tube 1 will make the insertion section 101 fit the inner wall of the outer tube 2 as much as possible downward, and because both are kept horizontal, the lowermost diagonal of the insertion section 101 of the inner tube 1 and the two outer walls forming the diagonal are correspondingly fitted with the lowermost diagonal of the outer tube 2 and the two inner walls forming the diagonal, and the fitting length is equal to the length of the insertion section 101 (that is, the two are completely docile), so that the exposed gap is effective and reliable; specifically:

[0079] like Figure 2 , 5As shown in Figures 6 and 7, the inner tube 1 and the outer tube 2 are both rectangular tubes. The inner tube 1 includes a pair of inner long side tube walls 103 and a pair of inner short side tube walls 104, and diagonals are formed between adjacent inner long side tube walls 103 and inner short side tube walls 104. Correspondingly, the outer tube 2 includes a pair of outer long side tube walls 201 and a pair of outer short side tube walls 202, and diagonals are formed between adjacent outer long side tube walls 201 and outer short side tube walls 202. The outer surface of the inner long side tube wall 103 corresponding to the diagonal of the lower end of the extension section 101 of the inner tube 1 is fitted with the inner surface of the lower end diagonal of the outer tube 2 and its corresponding outer long side tube wall 201, and the outer surface of the inner short side tube wall 104 corresponding to the diagonal of the lower end of the extension section 101 is fitted with the inner surface of the lower end diagonal of the outer tube 2 and its corresponding outer short side tube wall 202.

[0080] It also includes step S3-1, measuring the gap: after the lower part of the inserted section 101 is fitted with the inner wall of the outer tube 2, at least one gap required to be measured is formed between the upper part of the inserted section 101 and the inner wall of the outer tube 2, and the gap is measured and the gap size is recorded; in step S3-1, the outer wall of the lowermost end of the exposed section 102 is fitted with the corresponding support adjustment surface 20, and the outer wall of the lowermost end of the outer tube 2 is fitted with the corresponding support adjustment surface 20; the outer wall of the lowermost end of the inserted section 101 is fitted with the inner wall of the lowermost end of the inner tube 1, and accordingly, the gap required to be measured in the first section is formed between the outer wall of the uppermost end of the inserted section 101 and the inner wall of the uppermost end of the outer tube 2; the power unit is controlled to drive the pressure head 5 to rise to loosen the inner tube 1 and the outer tube 2, and the inner tube 1 and the outer tube 2 are turned 90° and clamped again, and the gap required to be measured in the second section is obtained in the same way; this operation is relatively cumbersome, so the following operation is selected in this embodiment:

[0081] In step S3-1, one of the diagonals of the inner tube 1 and one of the diagonals of the outer tube 2 are vertical and overlapped, the diagonal of the lowermost end of the exposed section 102 and the two outer walls forming the diagonal are in contact with the corresponding support adjustment surface 20, and the diagonal of the lowermost end of the outer tube 2 and the two outer walls forming the diagonal are in contact with the corresponding support adjustment surface 20; the diagonal of the lowermost end of the extended section 101 and the two outer walls forming the diagonal are in contact with the diagonal of the lowermost end of the outer tube 2 and the two inner walls forming the diagonal, and correspondingly, the two outer walls of the upper part of the extended section 101 are in contact with the outer Two gaps required to be measured are formed between the two inner walls of the upper part of the tube 2; the two gaps are the short side gap 13 and the long side gap 14 respectively; the gap between the outer surface of the inner short side tube wall 104 corresponding to the diagonal of the uppermost end of the extension section 101 and the inner surface of the outer short side tube wall 202 corresponding to the diagonal of the uppermost end of the outer tube 2 is the short side gap 13; the gap between the outer surface of the inner long side tube wall 103 corresponding to the diagonal of the uppermost end of the extension section 101 and the inner surface of the outer long side tube wall 201 corresponding to the diagonal of the uppermost end of the outer tube 2 is the long side gap 14.

[0082] The pressure head 5 and the floating seat 8 both act on the exposed section 102; one of the functions of the pressure Fn and the elastic force F is to make the center lines of the inner tube 1 and the outer tube 2 parallel to each other, ensuring the fit of the inner tube 1 and the outer tube 2, so that the obtained gap is reliable enough, that is, only when the two pairs of tube walls of the inner tube 1 and the outer tube 2 at the bottom are in contact, the gap between the two pairs of tube walls at the top is the accurate gap between the inner tube 1 and the outer tube 2; each pipe fitting has three force application points to achieve balance, and the floating elastic force F changes under the action of the pressure Fn, which can keep the two ends of the pipe fitting in the same straight line, and then reach a horizontal level, preventing the influence caused by uneven plastic spraying of the pipe fitting; the inner tube 1 and the outer tube 2 are both kept horizontal to ensure that the extended section 101 of the inner tube 1 fits with the inner wall of the outer tube 2 in the outer tube 2.

[0083] Furthermore, if Figure 3-6 As shown, the pressure head 5 is slidably arranged on a sliding seat 15 and is located at one end of the sliding seat 15, and the other end of the sliding seat is fixedly connected to a vertically arranged bracket 19, and the bracket 19 is fixedly connected to the base 3; the sliding seat 15 is arranged along the width direction of the base 3, and the sliding seat 15 is also provided with a cylinder 16 for controlling the lifting and lowering of the pressure head 5, and the cylinder 16 is controlled by the switch 4; the switch 4 is toggled to make the cylinder 16 push the pressure head 5 to press the pipe fitting or pull up the pressure head 5 to release the pipe fitting; and the pressure head 5 also has a clamping groove 51 formed in the same manner as the accommodating groove 9 to adapt to the shape of the pipe fitting; the pressure Fn applied by the pressure head 5 is vertically downward, and the elastic force F applied by the floating seat 8 is also vertically upward accordingly, so that the outer wall of the inner tube 1 extending into the section 101 can fit downward with the inner wall of the outer tube 2.

[0084] In step 3-1, the measuring tool may be a laser measuring instrument or a feeler gauge 17. From a cost perspective, in this embodiment, the feeler gauge 17 is used as the measuring tool. Fig.10 As shown, the feeler gauge 17 is in the shape of a long strip. The feeler gauge 17 is made according to the different thicknesses of various sliding sheets. The feeler gauge 17 is formed with a plurality of scale segments 18 corresponding to sliding sheets of different thicknesses along its length direction. Each scale segment 18 is in the shape of a rectangular plate, and its shape is similar to that of the sliding sheet. Therefore, in step S4-1, the corresponding sliding sheet is directly selected by the scale segment 18 that can be inserted into the first gap and the second gap. The thickness of the scale segment 18 is twice the thickness of the corresponding sliding sheet. The specific feeler gauge 17 can also achieve the effect of rapid measurement. The feeler gauge 17 directly determines the sliding sheet model through the inserted scale segment 18, without the need to read the number and select the sliding sheet based on the number, which is faster and simpler.

[0085] Embodiment 2: The difference between this embodiment and embodiment 1 is that the pipe fitting is a round tube, that is, the inner tube 1 and the outer tube 2 of the sleeve are both round tubes, and some parts are changed accordingly because the pipe fitting is a round tube.

[0086] like Fig.11 , 12As shown, when the pipe fitting is a round pipe, the support adjustment surface 20 and the pressing surface 21 are both arc surfaces, and the central axes of the support adjustment surface 20 and the pressing surface 21 are always kept horizontal. When the round pipe is fitted, they can also be kept horizontal. Fig.13 As shown, the cross-sectional profiles of the support adjustment surface 20 and the pressing surface 21 are V-shaped, which may achieve the above-mentioned effect; the round tube is located in the two surfaces of the V-shape, and there are four linear contacts in total, but the stability of the tube between the support adjustment surface 20 and the pressing surface 21 can still be maintained; the fit at this time is not complete, but it is the same as complete fit, and it plays a role in stabilizing the tube; but in this embodiment, the solution in which both the support adjustment surface 20 and the pressing surface 21 are arc surfaces is selected; accordingly, the accommodating groove 9, the clamping groove 51 and the avoidance groove 71 are all arc grooves.

[0087] In step S3 - 1 , the lowermost end of the outer wall of the extending section 101 is tangent to the inner wall of the outer tube 2 , and in the vertical direction, a gap S required to be measured is formed between the uppermost end of the outer wall of the extending section 101 and the uppermost end of the inner wall of the outer tube 2 .

Claims

1. A clamping device for measuring casing gap, characterized in that: include: It includes a base, two sets of clamping mechanisms and two sets of clamping units. The clamping units include: At least two support adjustment surfaces are arranged at intervals in the front and rear direction along the length direction of the pipe, and all the support adjustment surfaces can be arranged to float up and down; At least one pressing surface is horizontal along its length and is configured to keep the pipe fitting horizontal after the pressing surface is attached to the pipe fitting; the pressing surface is located between the two supporting adjustment surfaces at the front end and the rear end, and the pressing surface and the supporting adjustment surface are located at the upper and lower sides of the pipe fitting respectively; When the pipe is clamped by the pressing surface and the support adjustment surface, the pressing surface presses the pipe horizontally down onto the support adjustment surface, and the support adjustment surface then floats adaptively to keep the two ends of the pipe always on the same horizontal line; The base is configured as the main support of the device, and the two sets of clamping mechanisms are used to clamp the inner tube and the outer tube respectively, and the two sets of clamping mechanisms are arranged on the base; each clamping mechanism includes at least one pressure head and at least two sets of supporting components, the supporting components are arranged at intervals along the length direction of the base and are used to support the pipe fittings, the pressure head is located between the two supporting components at the front end and the rear end and is configured to be driven by a power unit to press or loosen the pipe fitting in the vertical direction; the supporting component includes a fixed seat and a floating seat, the fixed seat is fixedly installed on the base, and the floating seat is fixedly installed on the base. The movable seat is sleeved on the fixed seat and has the mobility to float up and down relative to the fixed seat; the floating seat is provided with a receiving groove adapted to the shape of the pipe fitting, and the pressure head is also provided with a clamping groove adapted to the shape of the pipe fitting; the pressing surface is formed on the groove wall of the clamping groove of the pressure head, and the supporting adjustment surface is formed on the groove wall of the receiving groove of the floating seat; when the inner tube and the outer tube are partially sleeved together and clamped by two clamping mechanisms respectively, the floating seat supporting the inner tube is higher than the floating seat supporting the outer tube and the height difference between the two is the thickness of the outer tube wall, so that the inner tube and the outer tube are both kept horizontal and close to each other.

2. The clamping device for measuring casing gap according to claim 1, characterized in that: The cross-sectional contours of the support adjustment surface and the pressing surface are both in line with the outer contour of the pipe fitting, and the support adjustment surface and the pressing surface are both horizontal along the extension direction of the cross-sectional contour.

3. The clamping device for measuring casing gap according to claim 2, characterized in that: The cross-sectional profiles of the support adjustment surface and the pressing surface are both V-shaped, and the support adjustment surface and the pressing surface are configured to fit both round tubes and square tubes.

4. The clamping device for measuring casing gap according to claim 2, characterized in that: When the pipe fitting is a round tube, the support adjustment surface and the pressing surface are both arc surfaces, and the central axes of the support adjustment surface and the pressing surface always remain in a horizontal state.

5. The clamping device for measuring casing gap according to claim 2, characterized in that: When the pipe fitting is a square tube, the cross-sectional profiles of the support adjustment surface and the pressure surface are both U-shaped.

6. The clamping device for measuring casing gap according to claim 1, characterized in that: The movement direction of the pressure head is perpendicular to the horizontal plane.

7. The clamping device for measuring casing gap according to claim 1, characterized in that: The shape of the accommodating groove matches the shape of the supporting and adjusting surface, and the shape of the clamping groove matches the shape of the pressing surface.

8. The clamping device for measuring casing gap according to claim 1, characterized in that: The fixed seat is vertically arranged on the base, the floating seat is provided with a sliding groove along the vertical direction, the floating seat sleeve is arranged on the fixed seat and the fixed seat is located in the sliding groove.

9. The clamping device for measuring casing gap according to claim 8, characterized in that: The fixed seat and the floating seat are both arranged along the width direction of the base. Springs are provided below the left and right ends of the floating seat. The springs are located between the floating seat and the base and act on the floating seat, so that the floating seat has an upward elastic force. When the floating seat is subjected to a force from top to bottom, the floating seat and the fixed seat slide relative to each other.

10. The clamping device for measuring casing gap according to claim 8, characterized in that: A limit pin is provided on the fixed seat, and the limit pin protrudes from the fixed seat front and back. A waist-shaped limit hole is correspondingly opened on the floating seat, and the limit pin is inserted in the limit hole. When the floating seat and the fixed seat slide relative to each other, the position of the limit pin in the limit hole also changes synchronously, and the limit pin and the limit hole jointly limit the excessive floating of the floating seat and prevent the floating seat from detaching from the fixed seat.

11. The clamping device for measuring casing gap according to claim 1, characterized in that: The center lines of the support adjustment surfaces on all floating seats are in the same straight line; the center lines of the pressing surfaces on all pressing heads are also in the same straight line; the center lines of the support adjustment surfaces and the center lines of the pressing surfaces are in the same vertical plane.

12. The clamping device for measuring casing gap according to claim 1, characterized in that: The power unit is an electric push rod, a hydraulic rod or a cylinder.

13. An application of a clamping device, characterized in that: The sleeve is clamped by using the clamping device described in any one of claims 1 to 12, wherein the sleeve is formed by partially sleeved inner and outer tubes, the portion of the inner tube located in the outer tube is the inserted section, and the portion of the inner tube exposed from the outer tube is the exposed section; the clamping device includes a preparatory state and a working state, in which the pressure head is raised to a maximum height to allow the sleeve to enter the clamping device; in the working state, the pressure head is lowered and presses the pipe fitting onto the floating seat to clamp the pipe fitting; The steps are: S1. Pre-installed casing: the clamping device is in a ready state. When the casing is placed on the clamping device, the outer tube is supported by one set of the supporting components, and the exposed section of the inner tube is supported by another set of supporting components. The exposed section of the inner tube and the outer tube are both located in the receiving groove of the floating seat and fit the support adjustment surface. At this time, the outer tube and the inner tube are in a floating state with the floating seat. S2. Clamping the casing: The clamping device enters the working state, controls the power unit to drive the pressure head to descend, and the pressure surfaces of the two pressure heads are respectively in contact with the exposed section of the inner tube and the outer tube, and the pressure heads continue to descend. The outer tube and the inner tube are lowered a certain distance together with the floating seat to ensure that the pressure head and the floating seat clamp the pipe fitting; at this time, the outer tube and the inner tube are both in a horizontal state; S3, fitting the pipe fitting: the pressure head located above the exposed section of the inner pipe continues to descend until the inserted section fits downwardly against the inner wall of the outer pipe; during this process, the inner pipe and the outer pipe always remain in a horizontal state.

14. Use of the clamping device according to claim 13, characterized in that: The floating seat has an upward elastic force. In step S2, the floating seat with the elastic force lifts the pipe fitting upward so that the pipe fitting fits both the pressing surface and the supporting and adjusting surface.

15. Use of the clamping device according to claim 13, characterized in that: In step S3, the length of the outer wall of the insertion section and the inner wall of the outer tube being attached is equal to the length of the insertion section.

16. Use of the clamping device according to claim 13, characterized in that: The method further includes step S3-1, measuring the gap: after the lower portion of the insertion section is fitted with the inner wall of the outer tube, at least one gap required to be measured is formed between the upper portion of the insertion section and the inner wall of the outer tube, and the gap is measured and the size of the gap is recorded.

17. Use of the clamping device according to claim 16, characterized in that: Both the inner tube and the outer tube are square tubes. In step S3-1, one of the diagonals of the inner tube is vertical and coincides with one of the diagonals of the outer tube. The diagonal of the lowermost end of the exposed section and the two outer walls forming the diagonal are fitted with the corresponding support adjustment surface, and the diagonal of the lowermost end of the outer tube and the two outer walls forming the diagonal are fitted with the corresponding support adjustment surface; the diagonal of the lowermost end of the extended section and the two outer walls forming the diagonal are fitted with the diagonal of the lowermost end of the outer tube and the two inner walls forming the diagonal. Correspondingly, a gap required to be measured between the two outer walls of the upper part of the extended section and the two inner walls of the upper part of the outer tube is formed.

18. Use of the clamping device according to claim 16, characterized in that: Both the inner tube and the outer tube are square tubes. In step S3-1, the outer wall of the lowermost end of the exposed section fits with the corresponding support adjustment surface, and the outer wall of the lowermost end of the outer tube fits with the corresponding support adjustment surface; the outer wall of the lowermost end of the inserted section fits with the inner wall of the lowermost end of the inner tube, and accordingly, the gap required to be measured in the first section is formed between the outer wall of the uppermost end of the inserted section and the inner wall of the uppermost end of the outer tube; the power unit is controlled to drive the pressure head to rise to loosen the inner tube and the outer tube, and the inner tube and the outer tube are flipped 90° and clamped again, and the gap required to be measured in the second section is obtained in the same way.

19. Use of the clamping device according to claim 16, characterized in that: Both the inner tube and the outer tube are circular tubes. The lowermost end of the outer wall of the insertion section is tangent to the inner wall of the outer tube. In the vertical direction, a gap required for measurement is formed between the uppermost end of the outer wall of the insertion section and the uppermost end of the inner wall of the outer tube.

20. Use of the clamping device according to claim 16, characterized in that: In step S3 - 1 , the gap between the inner tube and the outer tube is measured using a feeler gauge.

21. Use of the clamping device according to claim 16, characterized in that: In step S3 - 1 , a laser measuring instrument is used to measure the gap between the inner tube and the outer tube.

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