A Highly Efficient Method for Measuring Casing Gap

Abstract

The invention discloses a highly efficient casing gap measurement method, which comprises the following steps: S1, pre-setting pipe fittings: laying an outer pipe flat, and placing the outer pipe in a vertical state according to any diagonal thereof, and maintaining the state; placing an inner pipe in the same posture as the outer pipe, and partially inserting the inner pipe into the outer pipe, wherein the part of the inner pipe inserted into the outer pipe is an insertion section; S2, pipe fitting fittings: the diagonal of the lowermost end of the insertion section of the inner pipe and two outer walls forming the diagonal are correspondingly fitted with the diagonal of the lowermost end of the outer pipe and two inner walls forming the diagonal at one time, the fitting length is equal to the length of the insertion section, and the center line of the insertion section is parallel to the center line of the outer pipe; S3, forming a gap: a first gap is formed between the outer wall of one insertion section and the inner wall of the outer pipe adjacent thereto; correspondingly, a second gap is formed between the outer wall of the other insertion section and the inner wall of the outer pipe adjacent thereto; S4, measuring the gap: using a measuring tool to measure the first gap and the second gap respectively; the measuring method is fast and efficient.

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 high-efficiency sleeve gap measurement method. 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] Manufacturers often fill the gap by setting a sliding piece between the inner tube and the outer tube in the hope of eliminating the impact of the gap. However, the inner and outer surfaces of the inner tube and the outer tube are not finely processed, and their smoothness and flatness are poor, which brings difficulties to the selection of sliding pieces. The selection of sliding pieces must accurately correspond to the size of the gap to ensure smooth extension and lifting. Otherwise, if the selected sliding piece is too thin, the gap will not be filled completely, and the inner tube will shake in the outer tube, which will be unstable and will also hit the tube wall to cause noise. If the selected sliding piece is too thick, the relative sliding resistance between the inner tube and the outer tube is too large, which will cause power consumption and may also cause noise due to excessive friction of the sliding piece against the tube wall.

[0004] Therefore, in order to accurately select the appropriate sliding piece, the gap measurement must be accurate; the existing methods for measuring the gap generally include the following:

[0005] 1. Caliper measurement method: This method uses a caliper to measure the outer diameter of the inner tube and the inner diameter of the outer tube to calculate the gap size. It has low cost and fast measurement speed. However, the gap between the inner and outer tubes is not large, and the thickness difference between different types of sliding pieces is only a few inches. The accuracy of caliper measurement is too poor. If the measurer uses different forces when using the caliper, the measurement data may deviate by a few inches, thereby selecting the wrong sliding piece.

[0006] 2. Feeler gauge measurement method: In the sleeve of a rectangular tube or square tube, after an outer surface of the inner tube is fitted with an inner surface of the outer tube, a feeler gauge is used to measure the gap exposed above. Next, the sleeve is turned over 90 degrees, and an outer surface of the inner tube is fitted with an inner surface of the outer tube again, and a feeler gauge is used to measure the gap exposed above. The gaps measured before and after are different, which are the gaps in the horizontal and longitudinal directions of the sleeve respectively. The sliding piece is selected according to the measured gaps. This method directly measures the gap without calculation, but because it needs to be measured twice, and the sleeve needs to be loosened for the two measurements, and the sleeve needs to be turned over and clamped again, the process is cumbersome and time-consuming.

[0007] 3. Laser measurement method: Use laser to directly measure the pipe diameter and calculate the gap, or put the outer pipe on the inner pipe and measure the gap between the two. This method has high measurement accuracy and is easy to use, but the cost is too high, and the flatness of the pipe wall surface and the uneven thickness of the plastic spray on the inner and outer walls of the inner pipe will greatly affect the measurement results, thereby obtaining invalid results. Summary of the invention

[0008] In order to solve the above technical problems, the present invention provides a highly efficient casing gap measurement method, which allows the inner tube and the outer tube to fit together in a specific posture, thereby forming two gaps to be measured at one time, and finally measuring the gaps, with fast measurement speed and high efficiency.

[0009] The technical solution of the present invention is achieved in this way:

[0010] An efficient casing gap measurement method, the steps are:

[0011] S1. Pre-installing pipe fittings: Lay the outer pipe flat, and place it in a vertical position according to any diagonal line, and keep it in this position; place the inner pipe in the same position as the outer pipe, and partially insert it into the outer pipe. The part of the inner pipe inserted into the outer pipe is the insertion section;

[0012] S2. Fitting of pipe fittings: The diagonal corner of the lower end of the inner pipe insertion section and the two outer walls forming the diagonal corner are fitted with the diagonal corner of the lower end of the outer pipe and the two inner walls forming the diagonal corner at one time. The fitting length is equal to the length of the insertion section, and the center line of the insertion section is parallel to the center line of the outer pipe.

[0013] S3, forming a gap: between the uppermost diagonal of the inner tube extension section that is not bonded and the uppermost diagonal of the outer tube, a first gap is formed between the outer wall of one extension section and the inner wall of the adjacent outer tube; correspondingly, a second gap is formed between the outer wall of the other extension section and the inner wall of the adjacent outer tube;

[0014] S4: Measuring the gap: Use a measuring tool to probe into the gap to measure the width of the first gap and the second gap respectively to obtain corresponding values.

[0015] The method places the inner tube and the outer tube in a specific posture and fits them in this posture, thereby forming two gaps to be measured at one time and measuring the two gaps; the specific posture refers to that the pipe fitting lies flat and any diagonal line of the pipe fitting is vertical; the vertical refers to generally following the direction of the plumb line, but a small deviation from the plumb line can be allowed; fitting in this posture means that in this posture, both the inner tube and the outer tube have a diagonal at the lowest end of the four diagonals, or the lowest end of the tube body, and after fitting the diagonal at the lowest end of the inner tube and the outer tube, the two walls forming the diagonal will also fit, that is, the two outer walls of the inner tube forming the diagonal fit with the two inner walls of the outer tube forming the diagonal, and when the two pairs of tube walls of the inner tube and the outer tube fit together at one time, the gaps to be measured, that is, the first gap and the second gap, are formed between their other two pairs of tube walls at one time; all the gaps to be measured can be obtained by fitting the inner tube and the outer tube once, without the need for other operations, the steps are simple and the measurement is fast, thereby greatly improving the measurement efficiency.

[0016] Preferably, in step S2, the diagonal line formed by the diagonals of the uppermost and lowermost ends of the inner tube and the diagonal line formed by the diagonals of the uppermost and lowermost ends of the outer tube are both vertical and overlap each other. The two pairs of tube walls of the inner tube and the outer tube fit together, and at this time, the diagonals of the two are vertical and overlap.

[0017] More preferably, in step S2, the above diagonal lines are all perpendicular to the horizontal plane; when they are completely perpendicular to the horizontal plane, the fit between the inner and outer tubes is more snug.

[0018] Preferably, in step S2, pressure from bottom to top or from top to bottom and elastic force in the opposite direction of the pressure are applied to both the inner tube and the outer tube, and the pressure and elastic force are configured to keep the center lines of the inner tube and the outer tube parallel while clamping the inner tube and the outer tube. One of the functions of the pressure and the elastic force is to make the center lines of the inner tube and the outer tube parallel, ensuring the fit of the inner tube and the outer tube, so that the obtained gap is sufficiently reliable, that is, only when the two pairs of tube walls of the inner tube and the outer tube at the bottom are in harmony, the gap between the two pairs of tube walls at the top is the accurate gap between the inner tube and the outer tube.

[0019] Preferably, the inner tube further comprises an exposed section exposed from the outer tube, and pressure and elastic force are applied to the exposed section. The inserted section is located inside the outer tube, and it is difficult to apply pressure and elastic force to it.

[0020] Preferably, the elastic force has two outer tube force application points on the outer tube, and the pressure is applied between the two outer tube force application points. The pressure acts on the outer tube and the elastic force changes accordingly, so as to maintain the straightness of the two ends of the outer tube and make the outer tube in a horizontal lying state; the elastic force also has two inner tube force application points on the inner tube, and the pressure is applied between the two inner tube force application points. The pressure acts on the inner tube and the elastic force changes accordingly, so as to keep the inner tube horizontal while making the outer wall of the inner tube's extended section fit downward to the inner wall of the outer tube. Each pipe has three force application points to achieve balance, and the floating elastic force changes under the action of pressure, which can keep the two ends of the pipe in the same straight line and then reach horizontality, preventing the influence caused by uneven plastic spraying of the pipe; the inner and outer tubes are kept horizontal to ensure that the extended section of the inner tube fits the inner wall of the outer tube in the outer tube.

[0021] Preferably, the method further includes step S4-1, selecting a sliding sheet: preparing sliding sheets of several thicknesses in advance, and selecting a sliding sheet of corresponding thickness according to the measurement result of the first gap and the second gap in step S4.

[0022] Preferably, in step S4, the measuring tool is a feeler gauge, which is made according to the different thicknesses of multiple sliding pieces, and has multiple scale segments corresponding to sliding pieces of different thicknesses formed along its length direction, and the corresponding sliding piece is directly selected by inserting the scale segments into the first gap and the second gap. This specific feeler gauge can also achieve the effect of rapid measurement, and the feeler gauge directly determines the sliding piece model through the inserted scale segments, without the need to read the readings and then select the sliding piece based on the readings, which is faster and simpler.

[0023] Preferably, the thickness of the scale segment is twice the thickness of the corresponding sliding piece. The scale segment prefabricated in advance can greatly reduce the time for selecting the sliding piece.

[0024] Preferably, the sliding sheets of the plurality of thicknesses are respectively assigned different colors, each color corresponding to a thickness. Although it is conventional to assign a single color to a sliding sheet of a single thickness, assigning different colors to sliding sheets of multiple different thicknesses can improve recognition and make it easier to select a sliding sheet of a specific thickness.

[0025] Preferably, the inner tube and the outer tube are both rectangular tubes, the inner tube includes a pair of inner long side tube walls and a pair of inner short side tube walls, and a diagonal is formed between adjacent inner long side tube walls and inner short side tube walls. Correspondingly, the outer tube includes a pair of outer long side tube walls and a pair of outer short side tube walls, and a diagonal is formed between adjacent outer long side tube walls and outer short side tube walls. In step S2, the outer surface of the inner long side tube wall corresponding to the diagonal of the lower end of the inner tube extension section is fitted with the inner surface of the lower end diagonal of the outer tube and its corresponding outer long side tube wall, and the outer surface of the inner short side tube wall corresponding to the diagonal of the lower end of the extension section is fitted with the inner surface of the lower end diagonal of the outer tube and its corresponding outer short side tube wall.

[0026] Preferably, in step S3, the first spacing is the short side gap, and the second spacing is the long side gap; the gap between the outer surface of the inner short side tube wall corresponding to the diagonal of the uppermost end of the extended section and the inner surface of the outer short side tube wall corresponding to the diagonal of the uppermost end of the outer tube is the short side gap; the gap between the outer surface of the inner long side tube wall corresponding to the diagonal of the uppermost end of the extended section and the inner surface of the outer long side tube wall corresponding to the diagonal of the uppermost end of the outer tube is the long side gap.

[0027] The design starting point, concept and beneficial effects of the present invention using the above technical solution are:

[0028] 1. This method places the inner tube and the outer tube in a specific posture and fits them together in this posture, thereby forming two gaps to be measured at one time, and measuring the two gaps; the specific posture refers to the pipe fitting lying flat, and any diagonal line of the pipe fitting is vertical, and fitting in this posture means that in this posture, the inner tube and the outer tube both have a diagonal at the lowest end of the four diagonals, or the lowest end of the tube body, and after fitting the diagonal at the lowest end of the inner tube and the outer tube, the two walls forming the diagonal will also fit, that is, the two outer walls of the inner tube forming the diagonal and the two inner walls of the outer tube forming the diagonal fit, and when the two pairs of tube walls of the inner tube and the outer tube fit together at one time, the gaps to be measured, that is, the first gap and the second gap, are formed between their other two pairs of tube walls at one time; all the gaps to be measured can be obtained by fitting the inner tube and the outer tube once, without the need for other operations, the steps are simple and the measurement is fast, thereby greatly improving the measurement efficiency.

[0029] 2. One of the functions of pressure and elastic force is to make the center lines of the inner tube and the outer tube parallel to ensure the fit of the inner tube and the outer tube, so that the obtained gap is reliable enough, that is, only when the two pairs of tube walls at the bottom of the inner tube and the outer tube are in harmony, the gap between the two pairs of tube walls at the top is the accurate gap between the inner tube and the outer tube; each pipe has three force application points to achieve balance, and the floating elastic force changes under the action of pressure, which can keep the two ends of the pipe in the same straight line and then reach horizontality to prevent the influence caused by uneven plastic spraying of the pipe; the inner tube and the outer tube are kept horizontal to ensure that the extended section of the inner tube fits the inner wall of the outer tube in the outer tube.

[0030] 3. This particular feeler gauge can also achieve a quick measurement effect. The feeler gauge directly determines the type of the sliding piece by inserting the scale segment. There is no need to read the reading and select the sliding piece based on the reading. It is faster and simpler.

[0031] 4. Giving different colors to sliding pieces of different thicknesses can improve recognition and make it easier to select sliding pieces of specific thicknesses. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a flow chart of the measuring method in an embodiment of the present invention;

[0033] Figure 2 is a schematic diagram of the measuring method in an embodiment of the present invention;

[0034] Figure 3 It is a schematic diagram of the three-dimensional structure of the casing measuring device in an embodiment of the present invention;

[0035] Figure 4 It is a front view of a casing measuring device in an embodiment of the present invention;

[0036] Figure 5 This is a schematic diagram of the three-dimensional structure of the inner tube and the outer tube in the embodiment of the present invention being placed in the device;

[0037] Figure 6 It is a front view of the device in which the inner tube and the outer tube are placed in an embodiment of the present invention;

[0038] 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 the embodiment of the present invention;

[0039] Figure 8 It is a schematic diagram of the three-dimensional structure of the floating seat in the embodiment of the present invention;

[0040] Fig. 9 It is a schematic diagram of the three-dimensional structure of the fixing seat in the embodiment of the present invention;

[0041] Fig.10 Schematic diagram of the three-dimensional structure of the feeler gauge in the embodiment of the present invention.

[0042] The figures are marked 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. DETAILED DESCRIPTION

[0043] 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.

[0044] 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.

[0045] 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.

[0046] The specific implementation methods of the present invention are as follows:

[0047] like Figure 1 , 2 As shown, the present invention provides a highly efficient casing gap measurement method, the steps of which are:

[0048] S1. Pre-installing pipe fittings: Lay the outer pipe 2 flat, and place it in a vertical state according to any diagonal line of the outer pipe 2, and keep it in this state; place the inner pipe 1 in the same posture as the outer pipe 2, and partially insert it into the outer pipe 2, and the part of the inner pipe 1 inserted into the outer pipe 2 is the insertion section 101;

[0049] S2, pipe fittings: the diagonal corner of the lower end of the extension section 101 of the inner pipe 1 and the two outer walls forming the diagonal corner are fitted with the diagonal corner of the lower end of the outer pipe 2 and the two inner walls forming the diagonal corner at one time, and the fitting length is equal to the length of the extension section 101, and the center line of the extension section 101 is parallel to the center line of the outer pipe 2;

[0050] S3, forming a gap: between the uppermost diagonal of the inner tube 1 extension section 101 and the uppermost diagonal of the outer tube 2 that are not bonded, a first gap is formed between the outer wall of one extension section 101 and the inner wall of the adjacent outer tube 2; correspondingly, a second gap is formed between the outer wall of the other extension section 101 and the inner wall of the adjacent outer tube 2;

[0051] S4: Measuring the gap: Use a measuring tool to probe into the gap to measure the width of the first gap and the second gap respectively to obtain corresponding values.

[0052] The method puts the inner tube 1 and the outer tube 2 in a specific posture and fits them in this posture, thereby forming two gaps to be measured at one time and measuring the two gaps; the specific posture refers to the pipe fitting lying flat and any diagonal line of the pipe fitting being vertical, and fitting in this posture means that in this posture, the inner tube 1 and the outer tube 2 both have a diagonal at the lowest end of the four diagonals, or the lowest end of the tube body, and after fitting the diagonal at the lowest end of the inner tube 1 and the outer tube 2, the two walls forming the diagonal will also fit, that is, the two outer walls of the inner tube 1 forming the diagonal fit with the two inner walls of the outer tube 2 forming the diagonal, and when the two pairs of tube walls of the inner tube 1 and the outer tube 2 fit together at one time, the gaps to be measured, that is, the first gap and the second gap, are formed between their other two pairs of tube walls at one time; all the gaps to be measured can be obtained by fitting the inner tube 1 and the outer tube 2 once, without the need for other operations, the steps are simple and the measurement is fast, thereby greatly improving the measurement efficiency.

[0053] This particular gesture is achieved as follows:

[0054] like Figure 3-6 As shown, the measuring method is implemented by a casing gap measuring device, which includes a base 3, a switch 4 and two sets of clamping mechanisms (not numbered). The base 3 is a plate-shaped member and is configured as the main 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 cylinder 16; the clamping mechanism includes a pressure head 5 and two sets of supporting components 6, and the supporting components 6 are used to support the pipe. The pressure head 5 is located between the two sets of supporting components 6 and is located at a height higher than The supporting assembly 6 is used to press or loosen the pipe fitting from top to bottom, so that the clamping mechanism clamps or loosens the pipe fitting; four sets of supporting assemblies 6 are arranged on the base 3 in sequence along the length direction of the base 3 (i.e., the front-to-back direction), and the supporting assembly 6 includes a fixed seat 7 and a floating seat 8. The fixed seat 7 is fixedly installed on the base 3, and the floating seat 8 is sleeved on the fixed seat 7 and has the mobility to float up and down relative to the fixed seat 7; the floating seat 8 is provided with a receiving groove 9 that adapts to the shape of the pipe fitting, 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 receiving groove 9.

[0055] Specifically, if Figure 7-9As 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. For example, 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.

[0056] 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 ends 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, and due to the floating ability of the floating seat 8, the two ends of the outer tube 2 can maintain the same straightness. The outer tube 2 is placed in a horizontal lying state; similarly, the inner tube 1 is also clamped by the pressure head 5 and the floating seat 8, and is placed in a horizontal lying state; and since 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 since 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 at one time, and the fitting length is equal to the length of the insertion section 101 (i.e., the two are completely fitted), and step S3 is implemented at the same time, specifically:

[0057] like Figure 2 , 5 As shown in , 6, 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 adjacent inner long side tube walls 103 and inner short side tube walls 104 form a diagonal, and 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 adjacent outer long side tube walls 201 and outer short side tube walls 202 form a diagonal; in step S2, the outer surface of the inner long side tube wall 103 corresponding to the diagonal of the lower end of the inner tube 1 extending into the section 101 is fitted with the inner surface of the diagonal of the lower end of the outer tube 2 and its corresponding outer long side tube wall 201, and the lower end of the extending section 101 is The outer surface of the diagonally corresponding inner short side tube wall 104 is fitted with the inner surface of the lowermost diagonal of the outer tube 2 and its corresponding outer short side tube wall 202; in step S3, the first spacing is the short side gap 13, and the second spacing is the long side gap 14; the gap between the outer surface of the inner short side tube wall 104 corresponding to the uppermost diagonal of the extension section 101 and the inner surface of the outer short side tube wall 202 corresponding to the uppermost diagonal 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 uppermost diagonal of the extension section 101 and the inner surface of the outer long side tube wall 201 corresponding to the uppermost diagonal of the outer tube 2 is the long side gap 14.

[0058] The inner tube 1 also includes an exposed section 102 exposed from the outer tube 2, and 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 between the inner tube 1 and the outer tube 2, so that the obtained gap is sufficiently reliable, 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 harmony, 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, so that it can 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, ensuring 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.

[0059] 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; 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.

[0060] The method further includes step S4-1, selecting a sliding sheet: sliding sheets of several thicknesses are preset, and a sliding sheet of corresponding thickness is selected according to the measurement result of the first gap and the second gap in step S4.

[0061] The ultimate purpose of measuring the gap between the inner tube 1 and the outer tube 2 is to select a sliding piece with a suitable thickness; in step S4, if Fig.10 As shown, the measuring tool is a feeler gauge 17, which is in the shape of a long strip. The feeler gauge 17 is made according to the different thicknesses of various sliding pieces. The feeler gauge 17 is formed with a plurality of scale segments 18 corresponding to sliding pieces 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 piece. Therefore, in step S4-1, the corresponding sliding piece 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 piece; this particular feeler gauge 17 can also achieve the effect of rapid measurement. The feeler gauge 17 directly determines the sliding piece model by the inserted scale segment 18, without the need to read the number and select the sliding piece according to the number, which is faster and simpler.

Claims

1. A highly efficient casing gap measurement method, characterized in that: The steps are: S1. Pre-installing pipe fittings: Lay the outer pipe flat, and place it in a vertical position according to any diagonal line, and keep it in this position; place the inner pipe in the same position as the outer pipe, and partially insert it into the outer pipe. The part of the inner pipe inserted into the outer pipe is the insertion section; S2. Fitting of pipe fittings: The diagonal corner of the lower end of the inner pipe insertion section and the two outer walls forming the diagonal corner are fitted with the diagonal corner of the lower end of the outer pipe and the two inner walls forming the diagonal corner at one time. The fitting length is equal to the length of the insertion section, and the center line of the insertion section is parallel to the center line of the outer pipe. S3, forming a gap: between the uppermost diagonal of the inner tube extension section that is not bonded and the uppermost diagonal of the outer tube, a first gap is formed between the outer wall of one extension section and the inner wall of the adjacent outer tube; correspondingly, a second gap is formed between the outer wall of the other extension section and the inner wall of the adjacent outer tube; S4: Measuring the gap: Use a measuring tool to probe into the gap to measure the width of the first gap and the second gap respectively to obtain corresponding values.

2. The efficient casing gap measurement method according to claim 1, characterized in that: In step S2, a diagonal line formed by connecting the diagonals of the uppermost end and the lowermost end of the inner tube and a diagonal line formed by connecting the diagonals of the uppermost end and the lowermost end of the outer tube are both vertical and overlap each other.

3. The efficient casing gap measurement method according to claim 1, characterized in that: In step S2, the diagonal lines are all kept perpendicular to the horizontal plane.

4. The efficient casing gap measurement method according to claim 1, characterized in that: In step S2, pressure from bottom to top or from top to bottom and an elastic force opposite to the pressure direction are applied to both the inner tube and the outer tube, and the pressure and the elastic force are configured to keep the center lines of the inner tube and the outer tube parallel while clamping the inner tube and the outer tube.

5. The efficient casing gap measurement method according to claim 4, characterized in that: The inner tube also includes an exposed section exposed from the outer tube, and pressure and elastic force are applied to the exposed section.

6. The efficient casing gap measurement method according to claim 4, characterized in that: The elastic force has two outer tube force application points on the outer tube, and pressure is applied between the two outer tube force application points. The pressure acts on the outer tube and the elastic force changes accordingly, so as to maintain the straightness of the two ends of the outer tube and make the outer tube in a horizontal lying state; the elastic force also has two inner tube force application points on the inner tube, and pressure is applied between the two inner tube force application points. The pressure acts on the inner tube and the elastic force changes accordingly, so as to keep the inner tube horizontal and make the outer wall of the extended section of the inner tube fit downwardly into the inner wall of the outer tube.

7. The efficient casing gap measurement method according to claim 1, characterized in that: The method further includes step S4-1, selecting a sliding sheet: preparing sliding sheets of several thicknesses in advance, and selecting a sliding sheet of corresponding thickness according to the measurement result of the first gap and the second gap in step S4.

8. The efficient casing gap measurement method according to claim 7, characterized in that: In step S4, the measuring tool is a feeler gauge, which is made according to the different thicknesses of various sliding pieces. The feeler gauge has multiple scale segments corresponding to sliding pieces of different thicknesses formed along its length direction, and the corresponding sliding piece can be directly selected by the scale segments that can be inserted into the first gap and the second gap.

9. The efficient casing gap measurement method according to claim 8, characterized in that: The thickness of the scale segment is twice the thickness of the corresponding sliding piece.

10. The efficient casing gap measurement method according to claim 7, characterized in that: The sliding sheets of the several thicknesses are respectively given different colors, and each color corresponds to one thickness.

11. The efficient casing gap measurement method according to claim 1, characterized in that: The inner tube and the outer tube are both rectangular tubes, the inner tube includes a pair of inner long side tube walls and a pair of inner short side tube walls, and a diagonal is formed between the adjacent inner long side tube walls and the inner short side tube walls. Correspondingly, the outer tube includes a pair of outer long side tube walls and a pair of outer short side tube walls, and a diagonal is formed between the adjacent outer long side tube walls and the outer short side tube walls; in step S2, the outer surface of the inner long side tube wall corresponding to the diagonal of the lower end of the inner tube extension section is fitted with the inner surface of the lower end diagonal of the outer tube and its corresponding outer long side tube wall, and the outer surface of the inner short side tube wall corresponding to the diagonal of the lower end of the extension section is fitted with the inner surface of the lower end diagonal of the outer tube and its corresponding outer short side tube wall.

12. The efficient casing gap measurement method according to claim 11, characterized in that: In step S3, the first spacing is the short side gap, and the second spacing is the long side gap; the gap between the outer surface of the inner short side tube wall corresponding to the uppermost diagonal of the extended section and the inner surface of the outer short side tube wall corresponding to the uppermost diagonal of the outer tube is the short side gap; the gap between the outer surface of the inner long side tube wall corresponding to the uppermost diagonal of the extended section and the inner surface of the outer long side tube wall corresponding to the uppermost diagonal of the outer tube is the long side gap.

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