An inner diameter measuring device for steel pipe production

Abstract

The present invention relates to the technical field of steel pipe production. The present invention discloses an inner diameter measuring device for steel pipe production, comprising a handheld pushing mechanism, wherein the inner diameter measuring mechanism comprises a support rod, one end of the support rod is rotatably connected to an incomplete gear, and a rotating rod is fixed to one side of the incomplete gear. The inner diameter measuring device for steel pipe production, after inserting four rotating rods into the steel pipe, can hold the handle and push the pushing rod to the right, the first piston block moves to the right, driving the second piston block to move to the right, the first extrusion rod moves to the right, the second extrusion rod moves to the right, the slider and the moving plate move to the right, the incomplete gear rotates and drives the rotating rod to rotate, the four rotating rods rotate and open, and the four rotating rods finally all rest on the inner wall of the steel pipe, the support rod is automatically centered, and the rotation angle of the rotating rod can be understood by observing the scale. Since the length of the rotating rod is known, the distance between the outer end of the rotating rod and the center of the steel pipe can be calculated, thereby measuring the inner diameter of the steel pipe. The device can measure in the center, and the measurement is fast and accurate.

Description

Technical Field

[0001] The present invention relates to the technical field of steel pipe production, in particular to an inner diameter measuring device for steel pipe production. Background Art

[0002] Steel pipe is a steel material with a hollow cross-section and a length much larger than its diameter or circumference. Steel pipe has many applications, including industrial construction. Its main functions are to transport fluids and powdered cabinets, exchange heat, manufacture mechanical parts and containers, etc. It can also be used as an economical steel support. After the steel pipe is processed, it needs to use an internal diameter measuring device to measure the internal diameter of the steel pipe for applications in different fields with corresponding precision dimensions.

[0003] It is now found that the typical inner diameter measuring device in the prior art is disclosed in publication number CN115112029A, which is a device and method for measuring the inner diameter of the pipe end of a steel pipe, comprising: a moving mechanism installed at the inspection station of the steel pipe to be measured; a rotation control mechanism installed on the moving mechanism; a sensor installed on the rotation control mechanism to obtain data on the inner wall distance and angle of the steel pipe to be measured; an in-position signal detector to measure the in-position signal of the steel pipe to be measured; a diameter model calculation unit to collect the data from the sensor and the signal from the in-position signal detector, perform calculation processing and contour modeling on the data, and calculate the inner diameter of the pipe end of the steel pipe to be measured. The present invention adopts a non-contact online diameter measurement method, obtains the inner wall data points of the steel pipe end by combining a laser distance sensor with an angle sensor, forms a closed contour line after measuring the entire circumference, and calculates the diameter data through a diameter calculation model, thereby accurately measuring the true inner diameter of the steel pipe end.

[0004] Existing inner diameter measuring devices generally include vernier calipers or micrometers, but they can generally only measure the ends of steel pipes and are difficult to penetrate deep into the steel pipes for measurement. The measuring range is limited, and it is difficult to ensure that the measuring part is on the central axis of the steel pipe during the inner diameter measurement process. The offset of the measuring part will cause deviations in the measurement results, thereby affecting the accuracy of the measurement results. Using laser distance sensors for measurement will increase the measurement cost. To address the above problems, the existing equipment needs to be improved. Summary of the Invention

[0005] The purpose of the present invention is to provide an inner diameter measuring device for steel pipe production, so as to solve the problem raised in the above background technology that the existing inner diameter measuring devices generally have vernier calipers or micrometers, but generally can only measure the ends of the steel pipes, and it is difficult to extend into the deep of the steel pipes for measurement. The measuring range is limited, and it is difficult to ensure that the measuring parts are on the central axis of the steel pipe during the inner diameter measurement process. The offset of the measuring parts will cause deviations in the measurement results, thereby affecting the accuracy of the measurement results. The use of laser distance sensors for measurement will increase the measurement cost.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: an inner diameter measuring device for steel pipe production, comprising a handheld pushing mechanism, the handheld pushing mechanism comprising a handle, a pushing rod passing through one end of the handle, a first piston block fixed to one end of the pushing rod, a first oil storage tank provided in the handle, the first piston block slidably connected in the first oil storage tank, a second oil storage tank provided in the handle, the second oil storage tank being connected to the end of the first oil storage tank, a second piston block slidably connected in the second oil storage tank, a first extrusion rod fixed to one side of the second piston block, the first extrusion rod passing through the other end of the handle.

[0007] The other end of the handle is fixed with an extension rod by a fixing bolt, and one end of the extension rod is fixed with an inner diameter measuring mechanism by a fixing bolt. The inner diameter measuring mechanism includes a support rod, one end of the support rod is rotatably connected to an incomplete gear, and a rotating rod is fixed to one side of the incomplete gear.

[0008] Working principle: First, assemble the corresponding number of extension rods between the handle and the support rod according to the needs, then wrap the excess second connecting pipe around the pipe column, put the pressure plate on the outside of the pipe column and use the limit column to limit the second connecting pipe on the pipe column, then clamp the limit column on the handle, extend the four rotating rods to the specified depth of the steel pipe, hold the handle with one hand, and push the push rod to the right with the other hand. The first piston block moves to the right, and the second piston block moves to the right under the action of oil pressure. The moving distance of the first piston block is long, and the moving distance of the second piston block is short. The right movement of the second piston block drives the first extrusion rod to move to the right, thereby squeezing the second extrusion rod to move to the right. The limit block slides in the limit groove to play a limiting role. The slider and the moving plate are in the second extrusion The rod moves to the right under the extrusion of the rod. Since the rack is meshed with the incomplete gear, the rotation of the incomplete gear drives the rotating rod to rotate. The four rotating rods open, and the four rotating rods finally rest on the inner wall of the steel pipe. The handle, extension rod and support rod are automatically centered. The rubber gasket is squeezed and deformed by the inner wall of the steel pipe, thereby pressing the hydraulic oil in the fourth oil storage tank into the third oil storage tank. The third piston block moves to the right under the action of the oil pressure, and the clamping block moves to the right and unlocks the movable block. The movable block and the tooth plate automatically bounce down under the action of the first compression spring, and the tooth plate is clamped in the corresponding tooth groove, and the push rod is locked. The scale marks the rotation angle of the rotating rod. The rotation angle of the rotating rod can be understood by observing the scale. Since the length of the rotating rod is known, the inner diameter of the steel pipe can be calculated.

[0009] Preferably, a scale is fixed on the upper end surface of the push rod, and a tooth groove is provided on the upper end surface of the push rod, and the tooth grooves are evenly spaced on the push rod.

[0010] By adopting the above technical solution, after the four rotating rods are rotated and opened and pressed against the inner wall of the steel pipe, the push rod will be automatically locked. By observing the scale, the rotation angle of the rotating rod can be understood, and the inner diameter of the steel pipe can be calculated.

[0011] Preferably, a first sliding groove is provided in the handle, and a movable block is slidably connected in the first sliding groove, a pulling ring is fixed on the top of the movable block, and the pulling ring passes through the top of the handle, and a tooth plate is fixed on the bottom of the movable block, and the tooth plate is connected to the handle through a first compression spring.

[0012] By adopting the above technical solution, after the movable block is unlocked, the movable block and the latch plate will automatically spring down, the latch plate will be locked into the corresponding tooth groove, and the push rod will be locked.

[0013] Preferably, a third oil storage tank is provided in the handle, and a second compression spring is fixed in the third oil storage tank, a third piston block is fixed at one end of the second compression spring, and the third piston block is slidably connected in the third oil storage tank, a clamping block is fixed on one side of the third piston block, and the clamping block is clamped and connected to the movable block.

[0014] By adopting the above technical solution, when oil is pressed into the third oil storage tank, the third piston block and the clamping block move to the right and unlock the movable block.

[0015] Preferably, a winding column is fixed on the top of the handle, and a pressure plate is sleeved on the outside of the winding column. A limiting column is fixed on the bottom of the pressure plate, and the limiting column is snap-connected to the top of the handle. The bottom of the limiting column is made of rubber. There are four limiting columns, and the four limiting columns are evenly distributed circumferentially on the pressure plate.

[0016] By adopting the above technical solution, after the relevant components are stored by the winding pipe column, the pressure plate and the limiting column can be used in combination to suppress and limit the components.

[0017] Preferably, a second extrusion rod passes through the extension rod, and a limiting block is fixed on the outer side of the second extrusion rod. A limiting groove is provided in the extension rod, and the limiting block is slidably connected in the limiting groove.

[0018] By adopting the above technical solution, when the second extrusion rod moves to the right, the limiting block slides in the limiting groove, thereby conveniently playing a limiting role.

[0019] Preferably, a second sliding groove is opened in the support rod, and a third compression spring is fixed in the second sliding groove. A slider is fixed to one end of the third compression spring, and the slider is slidably connected in the second sliding groove. The slider passes through one end of the support rod.

[0020] By adopting the above technical solution, when the second extrusion rod moves to the right, it will squeeze the slider to move to the right.

[0021] Preferably, a movable plate is fixed on one side of the slider, and the movable plate passes through the other end of the support rod. A rack is fixed on the outer side of the movable plate, and the rack is meshed and connected to the inner side of the incomplete gear. There are four incomplete gears, and the four incomplete gears are evenly distributed circumferentially on the support rod.

[0022] By adopting the above technical solution, the rightward movement of the slider drives the moving plate to move rightward, thereby driving the four incomplete gears to rotate and the four rotating rods to rotate and open.

[0023] Preferably, a fourth oil storage tank is opened at one end of the rotating rod, and a rubber gasket is fixed in the fourth oil storage tank, and an annular pipe is fixed in the supporting rod. The four fourth oil storage tanks are all connected to the annular pipe through the first connecting pipe, and the top of the annular pipe is connected to the third oil storage tank through the second connecting pipe, and the second connecting pipe is wound on the pipe column.

[0024] By adopting the above technical solution, when the four rotating rods rotate and open and press against the inner wall of the steel pipe, the rubber gasket is compressed and deformed, thereby pressing oil into the third oil storage tank, and the redundant second connecting pipe is stored around the pipe column.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The inner diameter measuring device for steel pipe production can achieve the purpose of fast and accurate measurement through the mutual cooperation of the provided handle, push rod, scale, first piston block, second piston block, first extrusion rod, second extrusion rod, support rod, slider, movable plate, incomplete gear and rotating rod. After the four rotating rods are inserted into the steel pipe, the handle can be grasped and the push rod can be pushed to the right. The first piston block moves to the right, driving the second piston block to move to the right, the first extrusion rod moves to the right, the second extrusion rod moves to the right, the slider and the movable plate move to the right, the incomplete gear rotates and drives the rotating rod to rotate, the four rotating rods rotate and open, and the four rotating rods finally rest on the inner wall of the steel pipe. The support rod is automatically centered. The rotation angle of the rotating rod can be understood by observing the scale. Since the length of the rotating rod is known, the distance between the outer end of the rotating rod and the center of the steel pipe can be calculated, thereby measuring the inner diameter of the steel pipe. The device can measure in the center, and the measurement is fast and accurate.

[0027] 2. The inner diameter measuring device for steel pipe production can achieve the purpose of accurate reading by locking through the mutual use of the set push rod, movable block, tooth plate, third oil storage tank, third piston block, clamping block, rotating rod, fourth oil storage tank and rubber gasket. When the four rotating rods rotate and open and press against the inner wall of the steel pipe, the rubber gasket is squeezed and deformed by the inner wall of the steel pipe, and the hydraulic oil in the four fourth oil storage tanks is pressed into the third oil storage tank. The third piston block and the clamping block move to the right and unlock the movable block. The movable block and the tooth plate automatically pop down and lock the push rod. Locking first and then reading can make the reading result more accurate.

[0028] 3. The inner diameter measuring device for steel pipe production can achieve the purpose of deep measurement and convenient storage through splicing and assembly through the mutual use of the provided handle, pipe winding column, pressure plate, limit column, extension rod, support rod and second connecting pipe. Multiple extension rods can be installed between the handle and the support rod to facilitate the measurement of the inner diameter of the steel pipe at depth. The number of extension rods installed can be determined according to specific needs. The excess second connecting pipe can be wrapped around the pipe winding column for easy storage. The pressure plate and limit column can be used in combination to suppress and limit the second connecting pipe on the pipe winding column. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0030] Figure 2 It is a schematic diagram of the front cross-sectional structure of the present invention;

[0031] Figure 3 It is a structural schematic diagram of the inner diameter measuring mechanism of the present invention;

[0032] Figure 4 This is a schematic diagram of the connection structure between the pressing plate and the limiting column of the present invention;

[0033] Figure 5 This is a schematic diagram of the connection structure of the support rod, the second slide groove, the third compression spring, the movable plate, the rack, the first connecting pipe and the second connecting pipe of the present invention;

[0034] Figure 6 For the present invention Figure 2 A in the middle is an enlarged structural diagram;

[0035] Figure 7 For the present invention Figure 2 Enlarged structural diagram at point B in the middle.

[0036] In the figure: 1. Handheld pushing mechanism; 101. Handle; 102. Push rod; 103. Scale; 104. Tooth groove; 105. First piston block; 106. First oil reservoir; 107. Second oil reservoir; 108. Second piston block; 109. First extrusion rod; 110. First slide; 111. Movable block; 112. Lifting ring; 113. Clamping plate; 114. First compression spring; 115. Third oil reservoir; 116. Second compression spring; 117. Third piston block; 118. Clamping block; 119. Around the pipe column; 120, pressure plate; 121, limiting column; 2, extension rod; 3, fixing bolt; 4, limiting groove; 5, second extrusion rod; 6, limiting block; 7, inner diameter measuring mechanism; 701, support rod; 702, second slide groove; 703, third compression spring; 704, slider; 705, moving plate; 706, rack; 707, incomplete gear; 708, rotating rod; 709, fourth oil storage tank; 710, rubber gasket; 711, first connecting pipe; 712, annular pipe; 713, second connecting pipe. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0038] See also Figures 1 to 7 The present invention provides a technical solution: an inner diameter measuring device for steel pipe production, comprising a handheld pushing mechanism 1, the handheld pushing mechanism 1 comprising a handle 101, one end of the handle 101 is penetrated by a pushing rod 102, one end of the pushing rod 102 is fixed with a first piston block 105, a first oil storage tank 106 is provided in the handle 101, the first piston block 105 is slidably connected in the first oil storage tank 106, a second oil storage tank 107 is provided in the handle 101, the second oil storage tank 107 is penetrated by the end of the first oil storage tank 106, a second piston block 108 is slidably connected in the second oil storage tank 107, a first extrusion rod 109 is fixed to one side of the second piston block 108, and the first extrusion rod 109 penetrates the other end of the handle 101.

[0039] The other end of the handle 101 is fixed to the extension rod 2 by a fixing bolt 3, and one end of the extension rod 2 is fixed to the inner diameter measuring mechanism 7 by a fixing bolt 3. The inner diameter measuring mechanism 7 includes a support rod 701, and one end of the support rod 701 is rotatably connected to an incomplete gear 707, and a rotating rod 708 is fixed to one side of the incomplete gear 707.

[0040] In this embodiment, Figure 1 、 Figure 2 and Figure 6 As shown, a scale 103 is fixed to the upper end surface of the push rod 102, and a tooth groove 104 is opened on the upper end surface of the push rod 102, and the tooth grooves 104 are evenly spaced on the push rod 102. When the push rod 102 is pushed to the right, the first piston block 105 moves to the right accordingly, thereby pressing the hydraulic oil in the first oil storage tank 106 into the second oil storage tank 107, and the second piston block 108 moves to the right under the action of the oil pressure, thereby driving the first extrusion rod 109 to move to the right. The scale 103 marks the rotation angle of the rotating rod 708. By observing the scale 103, the rotation angle of the rotating rod 708 can be understood. Since the length of the rotating rod 708 is known, the inner diameter of the steel pipe can be calculated.

[0041] In this embodiment, Figure 1 、 Figure 2 and Figure 6 As shown, a first sliding groove 110 is provided in the handle 101, and a movable block 111 is slidably connected in the first sliding groove 110, a lifting ring 112 is fixed on the top of the movable block 111, and the lifting ring 112 passes through the top of the handle 101, a tooth plate 113 is fixed on the bottom of the movable block 111, and the tooth plate 113 is connected to the handle 101 through a first compression spring 114, and the first compression spring 114 is in a compressed state at the beginning. After unlocking the movable block 111, the movable block 111 and the tooth plate 113 automatically bounce down under the action of the first compression spring 114, and the tooth plate 113 is stuck in the corresponding tooth groove 104, which is convenient for locking the push rod 102. The push rod 102 can be unlocked by holding the lifting ring 112 to pull the movable block 111 and the tooth plate 113 upward and make the tooth plate 113 leave the tooth groove 104.

[0042] In this embodiment, Figure 2 and Figure 6 As shown, a third oil storage tank 115 is provided in the handle 101, and a second compression spring 116 is fixed in the third oil storage tank 115, and a third piston block 117 is fixed at one end of the second compression spring 116, and the third piston block 117 is slidably connected in the third oil storage tank 115, and a clamping block 118 is fixed on one side of the third piston block 117, and the clamping block 118 is clamped and connected to the movable block 111, and the second compression spring 116 supports the third piston block 117. When oil is pressed into the third oil storage tank 115, the third piston block 117 moves to the right, thereby driving the clamping block 118 to move to the right, making it easier to unlock the movable block 111, and the movable block 111 and the tooth plate 113 will automatically bounce down under the first compression spring 114.

[0043] In this embodiment, Figure 1 、 Figure 2 and Figure 4As shown, a pipe winding column 119 is fixed to the top of the handle 101, and a pressure plate 120 is sleeved on the outside of the pipe winding column 119, and a limiting column 121 is fixed to the bottom of the pressure plate 120, and the limiting column 121 is snap-connected to the top of the handle 101, and the bottom of the limiting column 121 is made of rubber. There are four limiting columns 121, and the four limiting columns 121 are evenly distributed on the pressure plate 120 in the circumferential direction. The pipe winding column 119 can be used to wind and place the storage component. After completing the storage work, the pressure plate 120 can be sleeved on the outside of the pipe winding column 119 and press the pipe, and at the same time, the limiting column 121 is clamped on the top of the handle 101 to facilitate fixing the pressure plate 120.

[0044] In this embodiment, Figure 2 As shown, a second extrusion rod 5 passes through the extension rod 2, and a limiting block 6 is fixed on the outer side of the second extrusion rod 5. A limiting slot 4 is provided in the extension rod 2, and the limiting block 6 is slidably connected in the limiting slot 4. Multiple extension rods 2 can be installed between the handle 101 and the support rod 701 through the fixing bolt 3. The number of extension rods 2 to be installed can be determined according to specific needs. Multiple extension rods 2 can be spliced ​​and assembled together by the fixing bolt 3. When the first extrusion rod 109 moves to the right, it will squeeze the second extrusion rod 5 to move to the right. At this time, the limiting block 6 slides in the limiting slot 4, which is convenient for limiting.

[0045] In this embodiment, Figure 2 and Figure 7 As shown, a second sliding groove 702 is provided in the support rod 701, and a third compression spring 703 is fixed in the second sliding groove 702. A slider 704 is fixed to one end of the third compression spring 703, and the slider 704 is slidably connected in the second sliding groove 702. The slider 704 passes through one end of the support rod 701. When the second extrusion rod 5 moves to the right, it squeezes the slider 704 to move to the right. The third compression spring 703 can assist the slider 704 in resetting.

[0046] In this embodiment, Figure 2 、 Figure 3 and Figure 7 As shown, a movable plate 705 is fixed to one side of the slider 704, and the movable plate 705 passes through the other end of the support rod 701, and a rack 706 is fixed to the outer side of the movable plate 705, and the rack 706 is meshed and connected to the inner side of the incomplete gear 707. There are four incomplete gears 707, and the four incomplete gears 707 are evenly distributed circumferentially on the support rod 701. When the slider 704 moves to the right, it will drive the movable plate 705 to move to the right. Since the rack 706 is meshed and connected with the incomplete gear 707, the four incomplete gears 707 can rotate with the movement of the movable plate 705, thereby driving the rotating rod 708 to rotate. The four rotating rods 708 are opened and rest against the inner wall of the steel pipe, and the handle 101, the extension rod 2 and the support rod 701 will be automatically centered.

[0047] In this embodiment, Figure 2 、 Figure 3 、 Figure 5 and Figure 7 As shown, a fourth oil storage tank 709 is opened at one end of the rotating rod 708, and a rubber gasket 710 is fixed in the fourth oil storage tank 709. An annular pipe 712 is fixed in the support rod 701. The four fourth oil storage tanks 709 are all connected to the annular pipe 712 through the first connecting pipe 711. The top of the annular pipe 712 is connected to the third oil storage tank 115 through the second connecting pipe 713. The second connecting pipe 713 is wound on the winding column 119. The first connecting pipe 711, the annular pipe 712 and the second connecting pipe 713 play the role of connecting the third oil storage tank 115 and the four fourth oil storage tanks 709. After rotating and opening, the rubber gasket 710 rests against the inner wall of the steel pipe. The rubber gasket 710 is squeezed by the inner wall of the steel pipe and presses the hydraulic oil in the fourth oil storage tank 709 into the third oil storage tank 115. The third piston block 117 moves to the right under the action of the oil pressure, and the locking block 118 moves to the right accordingly and unlocks the movable block 111. The movable block 111 and the locking plate 113 automatically spring down and lock the push rod 102. Then, the rotation angle of the rotating rod 708 can be understood by observing the scale 103. Fixing the push rod 102 and then reading the reading can make the reading result more accurate. The surrounding pipe column 119 plays the role of winding and storing the redundant second connecting pipe 713.

[0048] The use method and advantages of the present invention: The inner diameter measuring device for steel pipe production has the following working process:

[0049] like Figures 1 to 7As shown: First, assemble the corresponding number of extension rods 2 between the handle 101 and the support rod 701 according to the needs, then wrap the redundant second connecting pipe 713 around the pipe winding column 119, put the pressing plate 120 on the outside of the pipe winding column 119 and use the limiting column 121 to limit the second connecting pipe 713 on the pipe winding column 119, then clamp the limiting column 121 on the handle 101, extend the four rotating rods 708 to the specified depth of the steel pipe, hold the handle 101 with one hand and the other hand The hand pushes the push rod 102 to the right, the first piston block 105 moves to the right, and the second piston block 108 moves to the right under the action of oil pressure. The moving distance of the first piston block 105 is long, and the moving distance of the second piston block 108 is short. The right movement of the second piston block 108 drives the first extrusion rod 109 to move to the right, thereby squeezing the second extrusion rod 5 to move to the right. The limit block 6 slides in the limit groove 4 to play a role in limiting. The slider 704 and the movable plate 705 squeeze the second extrusion rod 5. Under the action, it moves to the right. Since the rack 706 is meshed with the incomplete gear 707, the rotation of the incomplete gear 707 drives the rotating rod 708 to rotate. The four rotating rods 708 are opened. The four rotating rods 708 finally all come into contact with the inner wall of the steel pipe. The handle 101, the extension rod 2 and the support rod 701 are automatically centered. The rubber gasket 710 is squeezed and deformed by the inner wall of the steel pipe, thereby pressing the hydraulic oil in the fourth oil storage tank 709 into the third oil storage tank 115. The third piston block 117 Under the action of oil pressure, it moves to the right, and the blocking block 118 moves to the right and unlocks the movable block 111. The movable block 111 and the tooth plate 113 automatically bounce down under the action of the first compression spring 114. The tooth plate 113 is stuck in the corresponding tooth groove 104, and the push rod 102 is locked. The scale 103 marks the rotation angle of the rotating rod 708. By observing the scale 103, the rotation angle of the rotating rod 708 can be understood. Since the length of the rotating rod 708 is known, the inner diameter of the steel pipe can be calculated.

[0050] In summary, the inner diameter measuring device for steel pipe production achieves the purpose of fast and accurate measurement, accurate reading through locking, deep measurement through splicing and assembly, and convenient storage, meeting people's usage needs.

[0051] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and modifications fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

[0052] The directions or positional relationships indicated by terms such as "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings. They are merely simplified descriptions for the convenience of describing the present invention, and do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the protection content of the present invention.

[0053] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An inner diameter measuring device for steel pipe production, comprising a handheld pushing mechanism (1), characterized in that: The handheld pushing mechanism (1) comprises a handle (101), one end of the handle (101) is penetrated by a pushing rod (102), one end of the pushing rod (102) is fixed with a first piston block (105), a first oil storage tank (106) is provided in the handle (101), the first piston block (105) is slidably connected in the first oil storage tank (106), and a second oil storage tank (107) is provided in the handle (101). The second oil storage tank (107) is connected to the end of the first oil storage tank (106), and a second piston block (108) is slidably connected in the second oil storage tank (107). A first extrusion rod (109) is fixed on one side of the second piston block (108), and the first extrusion rod (109) passes through the other end of the handle (101). A third oil storage tank (115) is provided in the handle (101), and a second compression spring (116) is fixed in the third oil storage tank (115). A third piston block (117) is fixed on one end of the second compression spring (116), and the third piston block (117) is slidably connected in the third oil storage tank (115). A clamping block (118) is fixed on one side of the third piston block (117), and the clamping block (118) is clamped and connected to the movable block (111); The other end of the handle (101) is fixed with an extension rod (2) through a fixing bolt (3), and one end of the extension rod (2) is fixed with an inner diameter measuring mechanism (7) through a fixing bolt (3). The inner diameter measuring mechanism (7) includes a support rod (701), one end of the support rod (701) is rotatably connected to an incomplete gear (707), and a rotating rod (708) is fixed on one side of the incomplete gear (707). A fourth oil storage tank (709) is opened at one end of the rotating rod (708), and a rubber gasket (710) is fixed in the fourth oil storage tank (709). An annular pipe (712) is fixed in the support rod (701), and the four fourth oil storage tanks (709) are all connected to the annular pipe (712) through a first connecting pipe (711). The top of the annular pipe (712) is connected to the third oil storage tank (115) through a second connecting pipe (713). The two connecting pipes (713) are interconnected, and the second connecting pipe (713) is wound around the pipe column (119).

2. The inner diameter measuring device for steel pipe production according to claim 1, characterized in that: A scale (103) is fixed on the upper end surface of the push rod (102), and a tooth groove (104) is provided on the upper end surface of the push rod (102), and the tooth grooves (104) are distributed at equal intervals on the push rod (102).

3. The inner diameter measuring device for steel pipe production according to claim 1, characterized in that: A first sliding groove (110) is provided in the handle (101), and a movable block (111) is slidably connected in the first sliding groove (110), a lifting ring (112) is fixed on the top of the movable block (111), and the lifting ring (112) passes through the top of the handle (101), and a tooth plate (113) is fixed on the bottom of the movable block (111), and the tooth plate (113) is connected to the handle (101) through a first compression spring (114).

4. The inner diameter measuring device for steel pipe production according to claim 1, characterized in that: A winding column (119) is fixed on the top of the handle (101), and a pressure plate (120) is sleeved on the outside of the winding column (119). A limiting column (121) is fixed on the bottom of the pressure plate (120), and the limiting column (121) is snap-connected to the top of the handle (101). The bottom of the limiting column (121) is made of rubber. Four limiting columns (121) are provided, and the four limiting columns (121) are evenly distributed circumferentially on the pressure plate (120).

5. The inner diameter measuring device for steel pipe production according to claim 1, characterized in that: The extension rod (2) is penetrated by a second extrusion rod (5), and a limiting block (6) is fixed on the outer side of the second extrusion rod (5). A limiting groove (4) is provided in the extension rod (2), and the limiting block (6) is slidably connected in the limiting groove (4).

6. The inner diameter measuring device for steel pipe production according to claim 1, characterized in that: A second sliding groove (702) is provided in the support rod (701), and a third compression spring (703) is fixed in the second sliding groove (702). A slider (704) is fixed to one end of the third compression spring (703), and the slider (704) is slidably connected in the second sliding groove (702). The slider (704) passes through one end of the support rod (701).

7. The inner diameter measuring device for steel pipe production according to claim 6, characterized in that: A movable plate (705) is fixed to one side of the slider (704), and the movable plate (705) passes through the other end of the support rod (701). A rack (706) is fixed to the outer side of the movable plate (705), and the rack (706) is meshed and connected to the inner side of the incomplete gear (707). Four incomplete gears (707) are provided, and the four incomplete gears (707) are evenly distributed circumferentially on the support rod (701).

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