A pipe installation method

Abstract

The present invention discloses a pipe installation method, which comprises the following steps: S1 selecting a sliding piece and a bushing, S2 clamping a pipe fitting, S3 installing the sliding piece and the bushing, S4 sleeve pipe, S5 friction test, S6 gap detection, S7 judgment of compliance, and S8 completion of pipe installation. First, the gap between the inner pipe and the outer pipe is measured to select the sliding piece and the bushing. After clamping the pipe fitting, the sliding piece and the bushing are installed. Then, the outer pipe is sleeved onto the inner pipe so that the sliding piece on the inner pipe and the outer pipe are slidably matched. Then, the outer pipe or the inner pipe is driven to slide relative to each other, the friction force during sliding is tested, and the outer pipe is shaken to detect whether there is a gap between the inner pipe and the outer pipe. Then, it is judged whether the friction test and the gap detection are qualified. If qualified, the support on the inner pipe is installed to the end of the outer pipe to complete the pipe installation. If unqualified, correction is made according to the above two tests and the pipe installation is carried out again.

Description

Technical Field

[0001] The present invention relates to the field of lifting tables, and in particular to a pipe installation method. Background Art

[0002] The columns or 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 of the lifting table. Since the extension and retraction of the inner and outer tubes require relative sliding of the two, sliding plates are often set between the inner and outer tubes to reduce friction. Neither the inner tube nor the outer tube is a finely processed product, and the smoothness and flatness of their inner and outer surfaces are poor. Therefore, the sliding friction generated when the inner and outer tubes slide relative to each other is not equal everywhere. Therefore, in the industry, it is often required that the friction between the inner and outer tubes is within a certain range. Excessive friction will reduce transmission efficiency and energy consumption, and even affect service life. Excessive friction means that there may be a gap between the inner and outer tubes, and the inner and outer tubes will shake, and the instability will also knock on the tube wall to cause noise. Therefore, friction testing will also be carried out when assembling the sleeve.

[0003] Existing casing assembly machines or friction testing machines are all arranged horizontally, with the inner and outer tubes also arranged horizontally. This arrangement is affected by gravity throughout the entire installation and testing process: during installation, the ends of the two tubes deviate from the horizontal line to a certain extent due to the influence of gravity. In particular, when encountering a sliding piece used to compensate for the gap, this part is difficult to insert into the outer tube, and the sliding piece may even be pushed off the inner tube due to the downward deviation of the outer tube. During testing, due to gravity, the inner and outer tubes cannot remain coaxial, and the friction force obtained by the test is obviously inconsistent with the actual friction, which makes the product use fail to meet expectations.

[0004] When installing pipes, suitable sliding pieces are often selected first. The sliding pieces are used to fill the gap so that the friction between the inner and outer pipes is within the preset qualified range. Friction tests are performed to determine whether the selected sliding pieces are suitable and whether the friction is qualified. In addition, attention must also be paid to the gap between the inner and outer pipes. The selection of sliding pieces will also affect whether there is a gap between the inner and outer pipes. When assembling the pipes, the gap between the inner and outer pipes also needs to be tested. Summary of the Invention

[0005] In order to solve the above-mentioned technical problems, the present invention provides a pipe installation method, which first measures the gap between the inner pipe and the outer pipe to select a sliding piece and a bushing, installs the sliding piece and the bushing after clamping the pipe fitting, and then puts the outer pipe on the inner pipe so that the sliding piece on the inner pipe and the outer pipe are slidably matched; then drives the outer pipe or the inner pipe to make the two slide relative to each other, tests the friction force during sliding, and shakes the outer pipe to detect whether there is a gap between the inner pipe and the outer pipe; then determines whether the friction force test and the gap detection are qualified. If qualified, the support on the inner pipe is installed to the end of the outer pipe to complete the pipe installation. If unqualified, the pipe is installed again after correction according to the above two tests.

[0006] The technical solution of the present invention is achieved as follows:

[0007] A pipe installation method, comprising the following steps:

[0008] S1 Select the sliding piece and bushing: measure the gap between the inner tube and the outer tube, and select the sliding piece and bushing according to the gap measurement data;

[0009] S2 clamping pipe fittings: clamp the inner pipe and outer pipe respectively, and the clamped inner pipe and outer pipe are arranged vertically and coaxially;

[0010] S3 Install the sliding piece and bushing: Put the selected bushing onto the inner tube, and install the selected sliding piece onto the inner tube;

[0011] S4 sleeve: drives the inner tube or outer tube so that the two are sleeved on each other, and at the same time makes the sliding piece on the inner tube enter the outer tube and slide with the outer tube;

[0012] S5 Friction Test: Drive the outer tube or the inner tube to make them slide relative to each other and complete an ascending and descending stroke, and obtain the friction force at each point between the outer tube and the inner tube during ascending and descending respectively;

[0013] S6 Check the gap: keep the inner tube fixed, loosen the clamping of the outer tube, and shake the outer tube to check the tightness of the fit between the inner and outer tubes;

[0014] S7: If the friction force obtained in step S5 is within the preset qualified range, and there is no shaking between the inner tube and the outer tube in step S6, the test is qualified and step S8 is performed; if the friction force obtained in step S5 is outside the preset qualified range, or there is still shaking between the inner tube and the outer tube in step S6, the test is unqualified and step 1 is restarted;

[0015] S8 Complete the pipe installation: Install the bushing on the inner pipe to the end of the outer pipe to complete the assembly.

[0016] This method performs friction testing and clearance testing during installation. Only those that pass the friction test and clearance testing are allowed to complete installation; those that fail require correction and debugging before restarting the installation. The inner and outer tubes are arranged vertically, which is more reasonable and more consistent with normal use than a horizontal arrangement, and the data obtained during the test is more reliable. The friction test can measure the maximum friction force during pulling at each position of the table leg. If it is within the upper and lower limits, it is qualified. If it exceeds the upper and lower limits, adjustment is required. The problem locations on the inner and outer tubes can be directly identified and then resolved by technicians. The pipes with the problem can be reassembled, greatly reducing the chance of scrap and saving costs. During the inspection clearance, the staff can directly shake the outer tube by hand to make a judgment, which is very simple and convenient and does not delay the efficiency of the pipe installation. The pipes that can be assembled are all in good working condition, without oil leakage, shaking or knocking noise due to clearance, or increased energy consumption due to excessive friction.

[0017] Preferably, in step S2, the outer tube is positioned above the inner tube, the outer tube is clamped by the first clamping mechanism, the inner tube is clamped by the second clamping mechanism, and the first lifting mechanism drives the first clamping mechanism to rise and fall so that the outer tube and the inner tube slide relative to each other. In this embodiment, the inner tube remains stationary, and the outer tube is raised and lowered relative to the inner tube to achieve operations such as sleeve operation.

[0018] Preferably, in step S4, the sliding plate is held on the inner tube by a positioning and locking mechanism; in step S6, the second clamping mechanism and the positioning and locking mechanism clamp the inner tube, while the first clamping mechanism releases the outer tube. The positioning and locking mechanism not only maintains the sliding plate in contact with the inner tube, but also locks the upper end of the inner tube (the second clamping mechanism locks the lower end of the inner tube) during gap detection, thereby maintaining the inner tube stable and preventing it from shaking. If a noticeable shaking sensation is felt when shaking the outer tube, it indicates that a gap exists between the outer and inner tubes.

[0019] Preferably, the positioning locking mechanism is raised and lowered along the axis of the inner tube by a second lifting mechanism. The positioning locking mechanism is movable relative to the inner tube. This is to take into account the possibility of multiple sets of sliding plates. On the other hand, it ensures that when the outer tube is sleeved on the inner tube, the positioning locking mechanism can still clamp the upper end of the inner tube, that is, it can avoid the outer tube and always act on the inner tube.

[0020] Preferably, in step S5, the force transmission data when the first lifting mechanism drives the first clamping mechanism and the outer tube to rise and fall is obtained by a sensor, and two sets of friction force data when the outer tube rises and falls are obtained by calculation.

[0021] Preferably, step S5 includes the steps of:

[0022] S5-1: Acquiring, through a sensor, initial force transmission data between the first clamping mechanism and the outer tube when the outer tube is sleeved on the inner tube;

[0023] S5-2: The first lifting mechanism drives the outer tube to descend relative to the inner tube. The sensor acquires a series of downward force transmission data provided by the first clamping mechanism and the outer tube in real time. The downward friction force is calculated by combining the series of downward force transmission data with the initial force transmission data and displayed on the display screen.

[0024] S5-3: The first lifting mechanism drives the outer tube to rise relative to the inner tube. The sensor obtains a series of rising force transmission data provided by the first clamping mechanism and the outer tube in real time, calculates the rising friction force by combining the series of rising force transmission data with the initial force transmission data, and displays it on the display screen.

[0025] When the outer tube slides on the inner tube, the friction will cause the force transmitted from the first lifting mechanism to the first clamping mechanism to change. The initial force transmission data is the force applied to the sensor by the first clamping mechanism and the outer tube when the outer tube is mounted on the inner tube and does not move. When the outer tube slides on the inner tube, the sensor will additionally receive the friction force between the outer and inner tubes, which is recorded and displayed on the display, completing the friction test.

[0026] Preferably, the friction force at each position when the inner tube and the outer tube are raised or lowered corresponds to a point on the display screen. In step S7, the point that exceeds the qualified range is a problem point. After correcting and debugging the positions of the inner tube and the outer tube corresponding to the problem point, restart step S1.

[0027] Preferably, the preset qualified range is also displayed on the display screen, making the determination of whether the friction test is qualified more intuitive.

[0028] Preferably, step S1 includes the steps of:

[0029] S1-1: Lay the outer tube flat so that any diagonal line of the outer tube is in a vertical position and maintain this position; place the inner tube in the same position as the outer tube and partially insert it into the outer tube. The part of the inner tube inserted into the outer tube is the insertion section;

[0030] S1-2: The diagonal corner at the lower end of the inner tube's insertion section and the two outer walls forming the diagonal corner are simultaneously fitted with the diagonal corner at the lower end of the outer tube and the two inner walls forming the diagonal corner. The fitting length is equal to the length of the insertion section, and the centerline of the insertion section is parallel to the centerline of the outer tube.

[0031] S1-3: Between the uppermost diagonal corner of the inner tube extension segment and the uppermost diagonal corner of the outer tube that are not bonded, a first gap is formed between the outer wall of one extension segment and the adjacent inner wall of the outer tube; correspondingly, a second gap is formed between the outer wall of the other extension segment and the adjacent inner wall of the outer tube;

[0032] S1-4: 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, obtain corresponding values, and select the sliding piece and the bushing according to the obtained values.

[0033] The method places the inner tube and the outer tube in a specific posture and fits them together in this posture, thereby forming two gaps that need to be measured at one time and measuring the two gaps; the specific posture refers to the tube fitting lying flat and any diagonal line of the tube fitting being vertical; the vertical refers to generally following the direction of the plumb line, but a small deviation from the plumb line is allowed; fitting in this posture means that in this posture, the inner tube and the outer tube each 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 that form the diagonal will also fit, that is, the two outer walls of the inner tube that form the diagonal fit with the two inner walls of the outer tube that form the diagonal fit. When the two pairs of tube walls of the inner tube and the outer tube are fitted together at one time, the gaps that need 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 that need 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.

[0034] Preferably, in step S1-2, the diagonal line connecting the diagonals of the uppermost and lowermost ends of the inner tube and the diagonal line connecting 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 are in contact, and the diagonals of the two are vertical and overlap.

[0035] Preferably, in step S1-2, pressure is applied to both the inner tube and the outer tube from the bottom up or from the top down, and a spring force is applied in the opposite direction of the pressure. The pressure and spring force are configured to maintain parallel centerlines of the inner and outer tubes while clamping them. One function of the pressure and spring force is to maintain parallel centerlines of the inner and outer tubes, ensuring a close fit between the inner and outer tubes and ensuring a sufficiently reliable gap. Specifically, only when the two pairs of tube walls at the bottom of the inner and outer tubes are in contact with each other, the gap between the two pairs of tube walls at the top is the accurate gap between the inner and outer tubes.

[0036] As an advantage, 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.

[0037] Preferably, 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 causes the elastic force to change accordingly, so as to maintain the straightness of the two ends of the outer tube and keep the outer tube in a horizontal and flat 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 causes the elastic force to change accordingly, so as to maintain the horizontality of the inner tube while making the outer wall of the inner tube's extension section fit downwardly against the inner wall of the outer tube. Each pipe has three force application points, so that it achieves balance. 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 achieve horizontality, preventing the impact caused by uneven plastic spraying of the pipe. The inner and outer tubes are both kept horizontal to ensure that the inner tube's extension section fits against the inner wall of the outer tube.

[0038] Preferably, the method further includes step S1-4-1, selecting a sliding sheet: preparing sliding sheets of several thicknesses in advance, and selecting a sliding sheet of corresponding thickness according to the measurement results of the first gap and the second gap in step S1-4.

[0039] Preferably, in step S1-4, the measuring tool is a feeler gauge, manufactured to accommodate various sliding sheet thicknesses. Multiple scale segments corresponding to sliding sheets of varying thickness are formed along the feeler gauge's length. The corresponding sliding sheet can be directly selected by inserting the scale segments into the first and second gaps. This particular feeler gauge also enables rapid measurement, as the feeler gauge directly determines the sliding sheet type based on the inserted scale segments, eliminating the need to read the scale segments and then select the sliding sheet based on the readings, resulting in a faster and simpler process.

[0040] Preferably, the thickness of the scale segment is twice the thickness of the corresponding sliding piece. The prefabricated scale segment can greatly reduce the time of selecting the sliding piece.

[0041] Preferably, the plurality of sliding sheets of different thicknesses are assigned different colors, each color corresponding to a thickness. While assigning a single color to a sliding sheet of a single thickness is common, 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.

[0042] The design starting point, concept and beneficial effects of the present invention using the above technical solution are:

[0043] This method performs friction testing and clearance testing during installation. Only those that pass the friction test and clearance testing are allowed to complete installation; those that fail require correction and debugging before restarting the installation. The inner and outer tubes are arranged vertically, which is more reasonable and more consistent with normal use than a horizontal arrangement, and the data obtained during the test is more reliable. The friction test can measure the maximum friction force during pulling at each position of the table leg. If it is within the upper and lower limits, it is qualified. If it exceeds the upper and lower limits, adjustment is required. The problem locations on the inner and outer tubes can be directly identified and then resolved by technicians. The pipes with the problem can be reassembled, greatly reducing the chance of scrap and saving costs. During the inspection clearance, the staff can directly shake the outer tube by hand to make a judgment, which is very simple and convenient and does not delay the efficiency of the pipe installation. The pipes that can be assembled are all in good working condition, without oil leakage, shaking or knocking noise due to clearance, or increased energy consumption due to excessive friction. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 This is a schematic diagram of the three-dimensional structure of the device in the embodiment of the present invention Figure 1 ;

[0045] Figure 2 This is a schematic diagram of the three-dimensional structure of the device in the embodiment of the present invention Figure 2 ;

[0046] Figure 3 This is a schematic diagram of a three-dimensional structure in which the first clamping mechanism and the positioning locking mechanism are installed on the vertical plate, and the second clamping mechanism is installed on the bottom plate in an embodiment of the present invention;

[0047] Figure 4 This is a schematic diagram of a three-dimensional structure in which the first lifting mechanism and the second lifting mechanism are installed on a vertical plate in an embodiment of the present invention;

[0048] Figure 5 Schematic diagram of the three-dimensional structure of the connection between the first clamping mechanism and the first lifting mechanism in an embodiment of the present invention;

[0049] Figure 6 Schematic diagram of the three-dimensional structure of the first clamping mechanism in the embodiment of the present invention Figure 1 ;

[0050] Figure 7 is a side view of the first clamping mechanism in an embodiment of the present invention;

[0051] Figure 8 Schematic diagram of the three-dimensional structure of the first clamping mechanism in the embodiment of the present invention Figure 2 ;

[0052] Figure 9Schematic diagram of the three-dimensional structure of the second clamping mechanism in an embodiment of the present invention;

[0053] Figure 10 This is a schematic diagram of the three-dimensional structure of the connection between the positioning locking mechanism and the second lifting mechanism in an embodiment of the present invention;

[0054] Figure 11 Schematic diagram of the three-dimensional structure of the positioning and locking mechanism in an embodiment of the present invention;

[0055] Figure 12 This is a flow chart of a pipe installation method in an embodiment of the present invention;

[0056] Figure 13 This is a flow chart of step S1 in an embodiment of the present invention;

[0057] Figure 14 This is a schematic diagram of step S1 when a square tube is used in an embodiment of the present invention.

[0058] The reference numerals are: vertical frame 1; supporting box 101; vertical plate 102; bottom plate 103; first clamping mechanism 2; upper seat plate 201; first connecting plate 202; top plate 203; first clamping block 204; first lifting mechanism 3; second clamping mechanism 4; lower seat plate 401; second clamping block 402; base 403; accommodating groove 404; positioning locking mechanism 5; second connecting plate 501; annular seat plate 502; third clamping block 503; window Mouth 504; opening 505; push-pull cylinder 506; second lifting mechanism 6; outer tube 7; inner tube 8; bushing 10; sensor 11; connecting seat 111; guide rod 112; linear bearing 113; guide rail 12; slider 13; first vertical slot 14; second vertical slot 15; connecting rod 16; reinforcing plate 17; adjustable cylinder 18; cylinder seat 181; cylinder body 182; piston rod 183; waist-shaped hole 19; control panel 20; display panel 21. DETAILED DESCRIPTION

[0059] In order to more clearly understand the above-mentioned objects, 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, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0060] 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 scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0061] 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.

[0062] The specific implementation of the present invention is as follows:

[0063] like Figure 12 As shown, the present invention provides a pipe installation method, the steps are:

[0064] S1 Select the sliding piece and bushing: measure the gap between the inner tube 8 and the outer tube 7, and select the sliding piece and bushing according to the gap measurement data;

[0065] S2 clamping pipe fittings: clamp the inner pipe 8 and the outer pipe 7 respectively, and the clamped inner pipe 8 and the outer pipe 7 are arranged vertically and coaxially;

[0066] S3: Install the sliding piece and the bushing: Put the selected bushing onto the inner tube 8, and install the selected sliding piece onto the inner tube 8;

[0067] S4 sleeve: drives the inner tube 8 or the outer tube 7 so that the two are sleeved on each other, and at the same time makes the sliding piece on the inner tube 8 enter the outer tube 7 and slide with the outer tube 7;

[0068] S5 Friction Test: Drive the outer tube 7 or the inner tube 7 to make the two slide relative to each other and complete an ascending and descending stroke, and obtain the friction force at each point between the outer tube 7 and the inner tube 8 during ascending and descending respectively;

[0069] S6 Check the gap: keep the inner tube 8 fixed, loosen the clamping of the outer tube 7, and shake the outer tube 7 to check the tightness of the fit between the inner tube 8 and the outer tube 7;

[0070] S7: If the friction force obtained in step S5 is within the preset qualified range, and there is no shaking between the inner tube 8 and the outer tube 7 in step S6, the test is qualified and step S8 is performed; if the friction force obtained in step S5 exceeds the preset qualified range, or there is still shaking between the inner tube 8 and the outer tube 7 in step S6, the test is unqualified and step 1 is restarted;

[0071] S8 completes the pipe installation: install the bushing on the inner pipe 8 to the end of the outer pipe 7 to complete the assembly.

[0072] The method for installing the pipes also performs friction tests and inspection gaps during the installation process. Only pipes that pass the friction test and inspection gap test can be installed. Those that fail the test need to be corrected and debugged before the installation is restarted. The inner pipe 8 and the outer pipe 7 are both arranged vertically, which is more reasonable and more in line with normal use than a horizontal arrangement. The data obtained during the test is more reliable. In the friction test, the maximum friction force of each position of the table leg during pulling can be measured. If it is within the upper and lower limits, it is qualified. If it exceeds the upper and lower limits, adjustment is required. In addition, the location of the problem on the inner pipe 8 and the outer pipe 7 can be directly found, and then solved by technicians. The pipes with the problem can be reassembled, which greatly reduces the scrap rate and saves costs. During the inspection gap, the staff can directly shake the outer pipe 7 by hand to make a judgment, which is very simple and convenient and will not delay the efficiency of the pipe installation work. The pipes that can be assembled are all in good working condition, without oil leakage, shaking or knocking noise due to the existence of gaps, and without increased energy consumption due to excessive friction.

[0073] The method is applied to an assembly device for a lifting column, specifically, Figure 1 、 2 As shown, the assembly equipment includes:

[0074] A vertical rack 1 is configured as the main support of the equipment;

[0075] The first clamping mechanism 2 is disposed on the upper portion of the vertical frame 1 and is driven to move up and down by a first lifting mechanism 3. The first clamping mechanism 2 is configured to clamp the outer tube 7 and drive the outer tube 7 to move up and down.

[0076] A first lifting mechanism 3 is mounted on the vertical frame 1 and connected to the first clamping mechanism 2;

[0077] The second clamping mechanism 4 is provided at the lower portion of the vertical frame 1 and is configured to clamp the inner tube 8;

[0078] A positioning locking mechanism 5 is provided on the vertical frame 1 and is located between the first clamping mechanism 2 and the second clamping mechanism 4. The positioning locking mechanism 5 is driven to rise and fall by a second lifting mechanism 6. The positioning locking mechanism 5 is configured to clamp a sliding piece (not shown) on the inner tube 8 to prevent the sliding piece from falling off the inner tube 8.

[0079] A second lifting mechanism 6 is mounted on the vertical frame 1 and connected to the positioning locking mechanism 5;

[0080] The first clamping mechanism 2 is lowered to allow the outer tube 7 to be sleeved onto the inner tube 8, and then raised and lowered to drive the outer tube 7 and the inner tube 8 to slide relative to each other;

[0081] The sensor 11 is provided on the first clamping mechanism 2 and is configured to obtain the friction force when the inner tube 8 and the outer tube 7 slide, and transmit the friction force to the display screen for display.

[0082] The first clamping mechanism 2, the second clamping mechanism 4 and the positioning locking mechanism 5 are all arranged in the direction of the height extension of the vertical frame 1, that is, the first clamping mechanism 2, the second clamping mechanism 4 and the positioning locking mechanism 5 are all arranged upright, which is more reasonable than the horizontal arrangement. The upright arrangement prevents the coaxiality of the pipes thereon from being affected by gravity. The inner tube 8 and the outer tube 7 can achieve a good coaxial effect by adjusting the position of the clamping mechanism. When testing the friction force between the inner tube 8 and the outer tube 7, it is more in line with the normal use state, so that the friction force data obtained by the sensor 11 is more real and reliable.

[0083] Specifically, if Figure 1 、 3 As shown in , 4, the vertical rack 1 includes a vertical cabinet-type support box 101, a vertical plate 102 and a bottom plate 103. The support box 101 is an external integral frame and serves as the main support of the entire equipment. The support box 101 is open to the front, and the vertical plate 102 and the bottom plate 103 are also arranged inside the support box 101. The working parts are all arranged on the vertical plate 102 and the bottom plate 103.

[0084] The base plate 103 is arranged horizontally, and the vertical plate 102 is arranged vertically on the base plate 103; the first clamping mechanism 2, the first lifting mechanism 3, the positioning locking mechanism 5 and the second lifting mechanism 6 are all arranged on the vertical plate 102, and the second clamping mechanism 4 is arranged on the base plate 103; and the first clamping mechanism 2 and the positioning locking mechanism 5 are arranged on the front surface of the vertical plate 102, the first lifting mechanism 3 and the second lifting mechanism 6 are arranged on the back of the vertical plate 102, and the second lifting mechanism 6 is located next to the first lifting mechanism 3; two vertically arranged guide rails 12 spaced apart and parallel to each other are also provided on the front surface of the vertical plate 102, and the cross-section of the guide rail 12 is roughly I-shaped, and the first clamping mechanism 2 and the positioning locking mechanism 5 are both slidably arranged on these two guide rails 12; the first clamping mechanism 2 and the positioning locking mechanism 5 are both provided with a slider 13 that slides with the guide rail 12; the first clamping mechanism 2 and its slider 13 are located at the upper end of the guide rail 12 in the initial state of work, while the positioning locking mechanism 5 and its slider 13 are located in the middle and lower part of the guide rail 12.

[0085] like Figure 4 、 5As shown in Figures 10 and 10, the first lifting mechanism 3 is connected to the first clamping mechanism 2 through a first vertical slot 14 provided on the vertical plate 102, and the second lifting mechanism 6 is connected to the positioning locking mechanism 5 through a second vertical slot 15 provided on the vertical plate 102. Similarly, the second vertical slot 15 is located beside the first vertical slot 14, and the two are arranged on the left and the right. Specifically, the first lifting mechanism 3 is located on the left side of the second lifting mechanism 6, and the first vertical slot 14 is also located on the left side of the second vertical slot 15.

[0086] The first lifting mechanism 3 and the second lifting mechanism 6 are both screw rod and nut mechanisms driven by a motor. The stroke of the first lifting mechanism 3 is greater than the stroke of the second lifting mechanism 6. Similarly, the length of the first vertical slot 14 in the vertical direction is greater than the length of the second vertical slot 15 in the vertical direction; the nuts of the first lifting mechanism 3 and the second lifting mechanism 6 are both provided with a connecting rod 16, the connecting rod 16 on the first lifting mechanism 3 passes through the first vertical slot 14 and is connected to the first clamping mechanism 2, and the connecting rod 16 on the second lifting mechanism 6 passes through the second vertical slot 15 and is connected to the positioning locking mechanism 5; the rear end portion of the nut and the connecting rod 16 are fixed together by screws, and the front end portions of the first clamping mechanism 2, the positioning locking mechanism 5 and the two connecting rods 16 are fixed together by screws.

[0087] The reason why the stroke of the first lifting mechanism 3 is greater than the stroke of the second lifting mechanism 6 is that the first lifting mechanism 3 needs to drive the first clamping mechanism 2 and the outer tube 7 to perform a friction test on the inner tube 8. The friction test needs to test and record data of every part of the pipe as comprehensively as possible. Therefore, the stroke of the first lifting mechanism 3 is larger, and the second lifting mechanism 6 drives the positioning and locking mechanism 5 to rise and fall, mainly to fix the sliding piece when the outer tube 7 is put on the inner tube 8, so that the sliding piece can smoothly enter the outer tube 7.

[0088] like Figure 5-8As shown, the first clamping mechanism 2 includes an upper seat plate 201, a first connecting plate 202, a top plate 203 and a first clamping assembly. The first connecting plate 202 is vertically arranged and fixedly connected to the connecting rod 16 and the slider 13. The connecting rod 16 and the slider 13 are both arranged on the back of the first connecting plate 202. The top plate 203 is connected to the first connecting plate 202 and is located in front of the first connecting plate 202. The first clamping assembly is installed below the upper seat plate 201; the sensor 11 is located between the top plate 203 and the upper seat plate 201. Specifically, the sensor 11 is connected to the first clamping mechanism 2 through a set of connecting assemblies. The connecting assembly The component includes a connecting seat 111 and a guide rod 112 vertically arranged on the connecting seat 111. There are four guide rods 112, which are evenly distributed around the sensor 11. The lower end of the guide rod 112 is inserted into the connecting seat 111 and fixedly connected to the connecting seat 111; the top plate 203 and the upper seat plate 201 are connected by a connecting assembly, the connecting seat 111 is connected to the upper surface of the upper seat plate 201, the upper end of the guide rod 112 is inserted into the top plate 203, and four linear bearings 113 are correspondingly provided on the top plate 203, and the guide rod 112 is inserted into the linear bearing 113; the sensor 11 is installed between the top plate 203 and the connecting seat 111.

[0089] The sensor 11 is an S-shaped tension and pressure sensor 11, the upper end of the sensor 11 is fixedly connected to the top plate 203, and the lower end of the sensor 11 is fixedly connected to the connecting seat 111; and the guide rod 112 is not subjected to force, only the sensor 11 is subjected to force, so that when performing a friction test, the sensor 11 can fully obtain the friction force generated when the outer tube 7 rises and falls on the inner tube 8.

[0090] Furthermore, a number of long reinforcing plates 17 are provided between the first connecting plate 202 and the top plate 203. The reinforcing plates 17 are arranged vertically and are respectively fixed to the connecting plate and the top plate 203; the first connecting plate 202 is arranged vertically and the top plate 203 is arranged horizontally. The connection stability between the two is poor, and it is not easy to keep the top plate 203 horizontal, especially since the top plate 203 also needs to support the first clamping assembly and the outer tube 7; therefore, a reinforcing plate 17 is provided between the first connecting plate 202 and the top plate 203. The reinforcing plate 17 strengthens the stability between the first connecting plate 202 and the top plate 203, so that the top plate 203 can remain horizontal.

[0091] The first clamping assembly includes a first clamping block 204 and an adjustable cylinder 18. The adjustable cylinder 18 is installed on the upper seat plate 201 through a cylinder seat 181. The cylinder seat 181 protrudes downward from the upper seat plate 201. The first clamping block 204 is set on the adjustable cylinder 18 and is driven by the adjustable cylinder 18 to move the first clamping block 204; the first clamping block 204 and the adjustable cylinder 18 are both arranged in the left and right directions, and the adjustable cylinder 18 is configured to be able to adjust the position of the first clamping block 204 in the left and right directions; specifically, the adjustable cylinder 18 includes a cylinder body 182 and a piston rod 183 with adjustable length in the left and right directions, the left and right ends of the piston rod 183 both protrude from the cylinder body 182, and the position of the first clamping block 204 in the left and right directions is adjusted by adjusting the length of the left and right ends of the piston rod 183, so as to laterally adjust the outer tube 7 clamped by the first clamping block 204.

[0092] There are two first clamping blocks 204, and correspondingly, there are also two adjustable cylinders 18. The two adjustable cylinders 18 can control the two first clamping blocks 204 to clamp the upper end of the outer tube 7 on the left and the right; the first clamping block 204 includes a head and a tail, the tail is connected to the piston rod 183, and the head is provided with a notch facing the outer tube 7, and the shape of the notch matches the shape of the outer tube 7, that is, the clamping block is replaceable. When the pipe fitting is a square tube, it can be replaced with a clamping block with a square notch shape. When the pipe fitting is a round tube, it can be replaced with a clamping block with a round notch shape.

[0093] A waist-shaped hole 19 is provided on the upper seat plate 201. The upper seat plate 201 is connected to the connecting seat 111 by screws passing through the waist-shaped hole 19, and is configured as a second clamping component that can adjust its position along the front-to-back direction. The waist-shaped hole 19 can be used to adjust the position of the inner tube 8 in the front-to-back direction. In addition, the adjustable cylinder 18 can adjust the position of the inner tube 8 in the left-to-right direction. Therefore, even if the inner tube 8 and the outer tube 7 are not coaxial in the initial state, the inner tube 8 and the outer tube 7 can be kept coaxial after adjustment.

[0094] like Figure 9 As shown, the second clamping mechanism 4 includes a lower seat plate 401 and a second clamping assembly, the lower seat plate 401 is horizontally mounted on the base plate 103, and the second clamping assembly is mounted on the upper surface of the lower seat plate 401; a waist-shaped hole 19 is also provided on the lower seat plate 401, and the lower seat plate 401 is connected to the base plate 103 by bolts arranged in the waist-shaped hole 19, and is configured so that the second clamping assembly can adjust its position along the front and rear directions; similarly, the second clamping assembly includes a second clamping block 402 and an adjustable cylinder 18, the second clamping block 402 is arranged on the adjustable cylinder 18 and is driven by the adjustable cylinder 18 to move the second clamping block 402; the second clamping block 402 and the adjustable cylinder 18 are both arranged along the left and right directions, and the adjustable cylinder 18 is configured to be able to adjust the position of the second clamping block 402 along the left and right directions; the characteristics of the second clamping block 402 are the same as those of the first clamping block 204, and are not repeated here.

[0095] A base 403 is further provided on the lower seat plate 401 , and a receiving groove 404 matching the shape of the pipe fitting is provided in the middle of the base 403 . The base 403 can also be replaced with pipe fittings of different shapes.

[0096] like Figure 10 、 11 As shown, the positioning locking mechanism 5 includes a second connecting plate 501, an annular seat plate 502 and a third clamping assembly. The annular seat plate 502 is horizontally arranged on the second connecting plate 501. The back of the second connecting plate 501 is connected to the slider 13 and the connecting rod 16 of the second lifting mechanism 6. The third clamping assembly is installed on the lower surface of the second connecting plate 501; a circular window 504 is provided on the annular seat plate 502 to avoid the inner tube 8, and a V-shaped opening 505 is also provided on the annular seat plate 502 in front of the window 504; a reinforcing plate 17 is also provided between the second connecting plate 501 and the annular seat plate 502.

[0097] The third clamping assembly includes a third clamping block 503 and a push-pull cylinder 506. There are four third clamping blocks 503 and push-pull cylinders 506 in total. The four third clamping blocks 503 are arranged around the pipe at 90° intervals. The third clamping block 503 also has a tail and a head, and its head also has a notch that matches the shape of the pipe.

[0098] The first clamp 204, the second clamp 402 and the third clamp 503 all have an unlocked state and a locked state; in the locked state, the clamps clamp the pipe, and the first clamp 204, the second clamp 402 and the third clamp 503 are all on the same vertical axis. The first clamp 204, the second clamp 402 and the third clamp 503 are made of elastomeric rubber.

[0099] The supporting box 101 is further provided with a control panel 20 and a display panel 21 with a display screen. The control panel 20 is provided with buttons for controlling the operation of the device, and the display panel 21 can display the vertical friction force obtained by the sensor 11.

[0100] The working process of the device is as follows:

[0101] Place the inner tube 8 equipped with the sliding piece and the bushing 10 on the base 403, and make the adjustable cylinder 18 of the second clamping mechanism 4 push the second clamping block 402 to clamp the lower end of the inner tube 8, and then make the push-pull cylinder 506 of the positioning locking mechanism 5 push the third clamping block 503 to clamp the upper end of the inner tube 8, that is, the position of the sliding piece. The third clamping block 503 presses the sliding piece on the inner tube 8 to prevent the sliding piece from falling off the inner tube 8 when the tube is installed; at this time, place the upper end of the outer tube 7 on the two second clamping blocks. The adjustable cylinder 18 of the first clamping mechanism 2 pushes the first clamping block 204 to clamp the upper end of the outer tube 7; then the first lifting mechanism 3 drives the first clamping mechanism 2 and the outer tube 7 to move downward. After the outer tube 7 moves down to the position of the sliding piece, the push-pull cylinder 506 drives the third clamping block 503 away from the inner tube 8. At this time, the outer tube 7 can continue to move downward, and the staff holds the bushing 10 to make the bushing 10 stuck in the pipe mouth of the outer tube 7. At this time, the pipe installation work is completed.

[0102] After the pipe installation is completed, the outer tube 7 continues to descend and then rises, performing a complete lifting stroke when simulating the operation of the lifting table, so that the sliding piece, the bushing 10 and the pipe fitting can be run-in; at this time, the staff can shake the outer tube 7 to confirm whether there is a large gap between the inner tube 8 and the outer tube 7; if it is qualified, a friction test is performed, and the first lifting mechanism 3 drives the outer tube 7 to slide downward on the inner tube 8. The sensor 11 obtains the friction force at each position of the pipe wall when the outer tube 7 slides downward and displays it in the form of a curve on the display panel 21; when the outer tube 7 is driven by the first lifting mechanism 3, the friction force at each position of the pipe wall is detected and displayed on the display panel 21 in the form of a curve; 7 slides upward on the inner tube 8, and the sensor 11 obtains the friction force at each position of the tube wall when the outer tube 7 slides upward and displays it in the form of a curve on the display panel 21. Finally, the friction test is judged to determine whether the friction force curve obtained on the display panel 21 is within the qualified range. In other words, during operation, whether the friction force at each point on the tube wall exceeds the qualified range. If the friction force curve is within the qualified range, the tube installation is completed and the friction test is passed. The first clamping block 204 and the second clamping block 402 loosen the tube fitting, and the staff removes the installed sleeve.

[0103] Some inner tubes 8 are equipped with two sets of upper and lower sliding plates. After the sliding plates are installed for the first time, the second lifting mechanism 6 drives the positioning and locking mechanism 5 to move down to the second set of sliding plates and push the second set of sliding plates tightly onto the inner tube 8. The first lifting mechanism 3 then drives the first clamping mechanism 2 to descend to the second set of sliding plates. After the third clamping block 503 is withdrawn, the first clamping mechanism 2 continues to descend to carry out subsequent work.

[0104] The above working process all saves the action of pressing buttons.

[0105] Furthermore, in step S4, the positioning and locking mechanism 5 is raised and lowered along the axis of the inner tube 8 by the second lifting mechanism 6, retaining the sliding piece on the inner tube 8 via the positioning and locking mechanism 5. In step S6, the second clamping mechanism 4 and the positioning and locking mechanism 5 clamp the inner tube 8, while the first clamping mechanism 2 releases the outer tube 7. The positioning and locking mechanism 5 not only maintains the sliding piece in contact with the inner tube 8, but also locks the upper end of the inner tube 8 (while the second clamping mechanism 4 locks the lower end) during gap detection, thereby maintaining the inner tube 8 stable and preventing it from shaking. If a noticeable shaking sensation is felt when shaking the outer tube 7, it indicates that there is a gap between the outer tube 7 and the inner tube 8.

[0106] Step S5 includes the steps of:

[0107] S5-1: Acquiring initial force transmission data between the first clamping mechanism 2 and the outer tube 7 when the outer tube 7 is sleeved on the inner tube 8 through the sensor 11;

[0108] S5-2: The first lifting mechanism 3 drives the outer tube 7 to descend relative to the inner tube 8. The sensor 11 obtains a series of downward force transmission data provided by the first clamping mechanism 2 and the outer tube 7 in real time. The downward friction force is calculated by combining the series of downward force transmission data with the initial force transmission data and displayed on the display screen.

[0109] S5-3: The first lifting mechanism 3 drives the outer tube 7 to rise relative to the inner tube 8. The sensor 11 obtains a series of rising force transmission data provided by the first clamping mechanism 2 and the outer tube 7 in real time, calculates the series of rising force transmission data and the initial force transmission data to obtain the rising friction force, and displays it on the display screen.

[0110] The preset qualified range is also displayed on the display screen; when the outer tube 7 slides on the inner tube 8, due to the existence of friction, the force transmitted to the first clamping mechanism 2 by the first lifting mechanism 3 will change. The initial force transmission data is the force given to the sensor 11 by the first clamping mechanism 2 and the outer tube 7 when the outer tube 7 is mounted on the inner tube 8 and does not move. When the outer tube 7 slides on the inner tube 8, the sensor 11 will additionally receive the friction between the outer tube 7 and the inner tube 8, and record and display it on the display screen to complete the friction test; the friction at each position when the inner tube 8 and the outer tube 7 are lifted and lowered corresponds to a point on the display screen. In step S7, the point that exceeds the qualified range is the problem point. After correcting and debugging the positions of the inner tube 8 and the outer tube 7 corresponding to the problem point, restart step S1.

[0111] Step S1 includes the steps of:

[0112] S1-1: Lay the outer tube 7 flat so that any diagonal line of the outer tube 7 is in a vertical position and maintain this position; place the inner tube 8 in the same position as the outer tube 7 and partially insert it into the outer tube 7. The portion of the inner tube 8 inserted into the outer tube 7 is the insertion section;

[0113] S1-2: The diagonal corner at the lower end of the insertion section of the inner tube 8 and the two outer walls forming the diagonal corner are simultaneously fitted with the diagonal corner at the lower end of the outer tube 7 and the two inner walls forming the diagonal corner. The fitting length is equal to the length of the insertion section, and the centerline of the insertion section is parallel to the centerline of the outer tube 7.

[0114] S1-3: Between the uppermost diagonal corner of the unlaminated inner tube 8 and the uppermost diagonal corner of the outer tube 7, a first gap is formed between the outer wall of one of the inner tube sections and the adjacent inner wall of the outer tube 7; correspondingly, a second gap is formed between the outer wall of the other inner tube section and the adjacent inner wall of the outer tube 7;

[0115] S1-4: 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, obtain corresponding values, and select the sliding piece and the bushing according to the obtained values.

[0116] like Figure 13 、 14 As shown, when the pipe fitting is a square pipe, the method puts the inner pipe 8 and the outer pipe 7 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 means that the pipe fitting is lying flat, and any diagonal line of the pipe fitting is vertical; the vertical means that it is generally in the direction of the plumb line, but a small deviation from the plumb line is allowed; fitting in this posture means that in this posture, the inner pipe 8 and the outer pipe 7 will have a diagonal at the lowest end of the four diagonal angles, or the lowest end of the pipe body, and the inner pipe 8 and the outer pipe 7 will be fitted together. After the diagonal portion of the outer tube 7 at the lower end is fitted, the two walls forming the diagonal portion will also fit together, that is, the two outer walls of the inner tube 8 forming the diagonal portion are fitted together with the two inner walls of the outer tube forming the diagonal portion. When the two pairs of tube walls of the inner tube 8 and the outer tube 7 are fitted together at one time, the gaps required for measurement, namely the first gap and the second gap, are formed between their other two pairs of tube walls at one time. All the gaps required for measurement can be obtained by fitting the inner tube 8 and the outer tube 7 together once, without the need for other operations. The steps are simple and the measurement is fast, thereby greatly improving the measurement efficiency.

[0117] In step S1-2, the diagonal line connecting the diagonals of the upper and lower ends of the inner tube 8 and the diagonal line connecting the diagonals of the upper and lower ends of the outer tube 7 are both vertical and overlap. The two pairs of tube walls of the inner tube 8 and the outer tube 7 are in contact with each other, and the diagonals of the two are vertical and overlap.

[0118] In step S1-2, pressure is applied to both the inner tube 8 and the outer tube 7, either from bottom to top or from top to bottom, and a spring force in the opposite direction of the pressure. This operation is performed on a work surface. The pressure can be provided by a gas rod positioned above the work surface, and the spring force can be provided by a spring mounted on the work surface and provided with a support seat (not shown). The support seat supports the inner tube 8 and the outer tube 7. When the gas rod pressure is applied, the support seat also moves downward. Simultaneously, the spring deforms to provide a floating spring force, allowing the inner tube 8 and the outer tube 7 to fit snugly and eliminate the influence of the outer tube wall thickness. The pressure and spring force are configured to maintain parallel centerlines of the inner tube 8 and the outer tube 7 while clamping the inner tube 7 and the outer tube 8. One function of the pressure and spring force is to maintain parallel centerlines of the inner tube 8 and the outer tube 7, ensuring the fit between the inner tube 8 and the outer tube 7, thereby ensuring a sufficiently reliable gap. That is, only when the two pairs of tube walls of the inner tube 8 and the outer tube 7 at the bottom are snugly fitted can the gap between the two pairs of tube walls at the top be the accurate gap between the inner and outer tubes.

[0119] The inner tube 8 also includes an exposed section exposed from the outer tube 7, and pressure and elastic force are applied to the exposed section. The inserted section is located inside the outer tube 7, and it is difficult to apply pressure and elastic force to it.

[0120] The elastic force has two external application points on the outer tube 7. Pressure is applied between these two points. The pressure acts on the outer tube 7, causing the elastic force to change accordingly, maintaining the straightness of the ends of the outer tube 7 and keeping the outer tube 7 in a horizontal, flat position. The elastic force also has two internal application points on the inner tube 8. Pressure is applied between these two points. The pressure acts on the inner tube 8, causing the elastic force to change accordingly, maintaining the horizontality of the inner tube 8 while forcing the outer wall of the inner tube 8's extended section downwardly to fit against the inner wall of the outer tube 7. Each pipe has three application points, achieving balance. The floating elastic force changes under the action of pressure, keeping the two ends of the pipe in the same straight line and thus achieving horizontality, preventing the impact of uneven plastic spraying on the pipe. The inner tube 8 and the outer tube 7 remain horizontal, ensuring that the extended section of the inner tube 8 fits against the inner wall of the outer tube 7.

[0121] The method further includes step S1-4-1, selecting a sliding sheet: preparing sliding sheets of several thicknesses in advance, and selecting a sliding sheet of corresponding thickness according to the measurement results of the first gap and the second gap in step S1-4.

[0122] In step S1-4, the measuring tool is a feeler gauge, manufactured to accommodate various sliding piece thicknesses. Multiple scale segments corresponding to sliding pieces of varying thickness are formed along its length. The corresponding sliding piece is directly selected by inserting the scale segments into the first and second gaps. This particular feeler gauge also enables rapid measurement, as the feeler gauge directly determines the sliding piece type based on the inserted scale segments, eliminating the need to read the scale segments and then select the sliding piece based on the readings, making it faster and simpler.

[0123] The thickness of the scale segment is twice the thickness of the corresponding sliding piece. The prefabricated scale segments can greatly reduce the time of selecting sliding pieces.

[0124] The sliding sheets of the various thicknesses are assigned different colors, each color corresponding to a thickness. While assigning a single color to a sliding sheet of a single thickness is common, assigning different colors to sliding sheets of multiple thicknesses can improve recognition and make it easier to select a sliding sheet of a specific thickness.

Claims

1. A pipe installation method, characterized in that: The steps are: S1 Select the sliding piece and bushing: measure the gap between the inner tube and the outer tube, and select the sliding piece and bushing according to the gap measurement data; Step S1 includes the steps of: S1-1: Lay the outer tube flat so that any diagonal line of the outer tube is in a vertical position and maintain this position; place the inner tube in the same position as the outer tube and partially insert it into the outer tube. The part of the inner tube inserted into the outer tube is the insertion section; S1-2: The diagonal corner at the lower end of the inner tube's insertion section and the two outer walls forming the diagonal corner are simultaneously fitted with the diagonal corner at the lower end of the outer tube and the two inner walls forming the diagonal corner. The fitting length is equal to the length of the insertion section, and the centerline of the insertion section is parallel to the centerline of the outer tube. S1-3: Between the uppermost diagonal corner of the inner tube extension segment and the uppermost diagonal corner of the outer tube that are not bonded, a first gap is formed between the outer wall of one extension segment and the adjacent inner wall of the outer tube; correspondingly, a second gap is formed between the outer wall of the other extension segment and the adjacent inner wall of the outer tube; S1-4: Measuring the gap: using a measuring tool to probe into the gap to measure the width of the first gap and the second gap respectively, obtaining corresponding values, and selecting the sliding piece and the bushing according to the obtained values; S2 clamping pipe fittings: clamp the inner pipe and outer pipe respectively, and the clamped inner pipe and outer pipe are arranged vertically and coaxially; S3 Install the sliding piece and bushing: Put the selected bushing onto the inner tube, and install the selected sliding piece onto the inner tube; S4 sleeve: drives the inner tube or outer tube so that the two are sleeved on each other, and at the same time makes the sliding piece on the inner tube enter the outer tube and slide with the outer tube; S5 Friction Test: Drive the inner or outer tube to make them slide relative to each other and complete an ascending and descending stroke. Measure the friction between the outer and inner tubes at various locations during the ascending and descending strokes. S6 Check the gap: keep the inner tube fixed, loosen the clamping of the outer tube, and shake the outer tube to check the tightness of the fit between the inner and outer tubes; S7: If the friction force obtained in step S5 is within the preset qualified range, and there is no shaking between the inner tube and the outer tube in step S6, the test is qualified and step S8 is performed; if the friction force obtained in step S5 is outside the preset qualified range, or there is still shaking between the inner tube and the outer tube in step S6, the test is unqualified and step 1 is restarted; S8 Complete the pipe installation: Install the bushing on the inner pipe to the end of the outer pipe to complete the assembly.

2. The pipe installation method according to claim 1, characterized in that: In step S2, the outer tube is located above the inner tube, the outer tube is clamped by the first clamping mechanism, the inner tube is clamped by the second clamping mechanism, and the first lifting mechanism drives the first clamping mechanism to move upward and downward so that the outer tube and the inner tube slide relative to each other.

3. The pipe installation method according to claim 2, wherein: In step S4, the sliding sheet is held on the inner tube by the positioning and locking mechanism; in step S6, the second clamping mechanism and the positioning and locking mechanism clamp the inner tube, and the first clamping mechanism releases the outer tube.

4. The pipe installation method according to claim 3, wherein: The positioning locking mechanism is lifted and lowered along the axis direction of the inner tube by the second lifting mechanism.

5. The pipe installation method according to claim 2, wherein: In step S5, the force transmission data when the first lifting mechanism drives the first clamping mechanism and the outer tube to rise and fall is obtained through the sensor, and two sets of friction force data when the outer tube rises and falls are obtained through calculation.

6. The pipe installation method according to claim 5, characterized in that: Step S5 includes the steps of: S5-1: Acquiring, through a sensor, initial force transmission data between the first clamping mechanism and the outer tube when the outer tube is sleeved on the inner tube; S5-2: The first lifting mechanism drives the outer tube to descend relative to the inner tube. The sensor acquires a series of downward force transmission data provided by the first clamping mechanism and the outer tube in real time. The downward friction force is calculated by combining the series of downward force transmission data with the initial force transmission data and displayed on the display screen. S5-3: The first lifting mechanism drives the outer tube to rise relative to the inner tube. The sensor obtains a series of rising force transmission data provided by the first clamping mechanism and the outer tube in real time, calculates the rising friction force by combining the series of rising force transmission data with the initial force transmission data, and displays it on the display screen.

7. The pipe installation method according to claim 6, characterized in that: The friction force at each position when the inner tube and outer tube are raised or lowered corresponds to a point on the display screen. In step S7, the point that exceeds the qualified range is a problem point. After correcting and debugging the inner tube and outer tube positions corresponding to the problem point, restart step S1.

8. The pipe installation method according to claim 7, characterized in that: The preset qualified range is also shown on the display.

9. The pipe installation method according to claim 1, wherein: In step S1-2, a diagonal line connecting the diagonals of the uppermost end and the lowermost end of the inner tube and a diagonal line connecting the diagonals of the uppermost end and the lowermost end of the outer tube are both vertical and overlap with each other.

10. The pipe installation method according to claim 1, wherein: In step S1-2, 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. The pressure and the elastic force are configured to keep the center lines of the inner tube and the outer tube parallel while clamping them.

11. The pipe installation method according to claim 10, characterized in that: The inner tube further comprises an exposed section exposed from the outer tube, and pressure and elastic force are applied to the exposed section.

12. The pipe installation method according to claim 10, 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 causes the elastic force to change 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 causes the elastic force to change 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.

13. The pipe installation method according to claim 1, wherein: The method further includes step S1-4-1, selecting a sliding sheet: preparing sliding sheets of several thicknesses in advance, and selecting a sliding sheet of corresponding thickness according to the measurement results of the first gap and the second gap in step S1-4.

14. The pipe installation method according to claim 13, wherein: In step S1-4, the measuring tool is a feeler gauge, which is made according to the different thicknesses of multiple sliding pieces. The feeler gauge has multiple scale segments corresponding to sliding pieces of different thicknesses formed along its length. The corresponding sliding piece can be directly selected by inserting the scale segments into the first gap and the second gap.

15. The pipe installation method according to claim 14, characterized in that: The thickness of the scale segment is twice the thickness of the corresponding sliding piece.

16. The pipe installation method according to claim 13, wherein: The sliding sheets of the several thicknesses are respectively given different colors, and each color corresponds to one thickness.

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