Inner diameter measuring device for steel pipe production

Abstract

The invention relates to the technical field of steel pipe production, and discloses an inner diameter measuring device for steel pipe production, which comprises a handheld pushing mechanism, the inner diameter measuring device comprises a supporting rod, one end of the supporting rod is rotatably connected with an incomplete gear, and one side of the incomplete gear is fixedly provided with a rotating rod. According to the inner diameter measuring device for steel pipe production, after four rotating rods extend into a steel pipe, a grip can be held by a hand and a push rod is pushed rightwards, a first piston block moves rightwards to drive a second piston block to move rightwards, a first extrusion rod moves rightwards, a second extrusion rod moves rightwards, a sliding block and a moving plate move rightwards, an incomplete gear rotates to drive the rotating rods to rotate, and the four rotating rods rotate to be opened; the four rotating rods finally abut against the inner wall of the steel pipe, the supporting rods are automatically centered, the rotating angles of the rotating rods can be known by observing scales, the distance between the outer ends of the rotating rods and the center of the steel pipe can be calculated due to the fact that the lengths of the rotating rods are known, the inner diameter of the steel pipe is measured accordingly, and the device can conduct centered measurement and is rapid and accurate in measurement.

Description

Technical Field

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

[0002] A steel pipe is a steel product with a hollow cross-section, and its length is much greater than its diameter or circumference. Steel pipes are used in a wide range of applications, including industrial and construction fields. Their main functions are to transport fluids and powdered materials, exchange heat energy, manufacture mechanical parts and containers, etc. They can also be used as economic steel for support. After the steel pipe is processed, for applications in different fields, corresponding precision dimensions are required, and an inner diameter measuring device is needed to measure the inner diameter of the steel pipe.

[0003] It is found that a typical inner diameter measuring device in the prior art is, for example, the one disclosed in Publication No. CN115112029A, an inner diameter measuring device and method for the pipe end of a steel pipe, which includes: a moving mechanism installed at the detection 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 for obtaining data on the inner wall distance and angle of the steel pipe to be measured; a position signal detector for measuring the position signal of the steel pipe to be measured; and a diameter model calculation unit for collecting the data of the sensor and the signal of the position signal detector, performing calculation processing and contour modeling on the data, and calculating the inner diameter of the pipe end of the steel pipe to be measured. The present invention adopts a non-contact on-line diameter measurement method. By combining a laser distance sensor with an angle sensor, data points on the inner wall of the steel pipe end are measured. After measuring the entire circumference, a closed contour line is formed, and the diameter data is calculated through a diameter calculation model, so as to accurately measure 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 extend deep into the steel pipes for measurement. The measurement range is limited, and it is difficult to ensure that the measuring piece is on the central axis of the steel pipe during the inner diameter measurement process. The deviation of the measuring piece will cause deviation in the measurement result, thus affecting the accuracy of the measurement result. Using a laser distance sensor 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 problems in the above background art that 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 extend deep into the steel pipes for measurement. The measurement range is limited, and it is difficult to ensure that the measuring piece is on the central axis of the steel pipe during the inner diameter measurement process. The deviation of the measuring piece will cause deviation in the measurement result, thus affecting the accuracy of the measurement result. Using a laser distance sensor for measurement will increase the measurement cost.

[0006] To achieve the above-mentioned purpose, 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 is provided in the handle, the first piston block is slidably connected in the first oil storage tank, a second oil storage tank is provided in the handle, the second oil storage tank is connected to the end of the first oil storage tank, a second piston block is slidably connected in the second oil storage tank, a first extrusion rod is fixed to one side of the second piston block, and the first extrusion rod passes through the other end of the handle.

[0007] An extension rod is fixed to the other end of the handle via a fixing bolt, an inner diameter measuring mechanism is fixed to one end of the extension rod via 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 and connected together, the rotation of the incomplete gear drives the rotating rod to rotate, and the four rotating rods open. The four rotating rods finally rest on the inner wall of the steel pipe, and 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 accordingly and unlocks the movable block. The movable block and the clamping tooth plate automatically bounce down under the action of the first compression spring, and the clamping tooth plate is clamped into the corresponding tooth groove, so that 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 rotate and open and all abut against the inner wall of the steel pipe, the top push rod will be automatically locked, and the rotation angle of the rotating rod can be understood by observing the scale, and thus the inner diameter of the steel pipe can be calculated.

[0011] Preferably, a first sliding groove is formed in the grip, and a movable block is slidably connected in the first sliding groove. A lifting ring is fixed to the top of the movable block, and the lifting ring penetrates through the top of the grip. A toothed plate is fixed to the bottom of the movable block, and the toothed plate is connected to the grip through a first compression spring.

[0012] By adopting the above technical solution, after unlocking the movable block, the movable block and the toothed plate will automatically bounce down, and the toothed plate is stuck in the corresponding tooth groove, and the top push rod is locked.

[0013] Preferably, a third oil storage groove is formed in the grip, and a second compression spring is fixed in the third oil storage groove. One end of the second compression spring is fixed with a third piston block, and the third piston block is slidably connected in the third oil storage groove. A clamping block is fixed to one side of the third piston block, and the clamping block is snap-connected to the movable block.

[0014] By adopting the above technical solution, when pressing oil into the third oil storage groove, the third piston block and the clamping block move rightward to unlock the movable block.

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

[0016] By adopting the above technical solution, after storing the relevant components by using the pipe-winding column, the pressing plate and the limiting column can be used in combination to press and limit the components.

[0017] Preferably, a second extrusion rod penetrates through the extension rod, and a limiting block is fixed to the outside of the second extrusion rod. A limiting groove is formed in the extension rod, and the limiting block is slidably connected in the limiting groove.

[0018] By adopting the above technical solution, during the rightward movement of the second extrusion rod, the limiting block slides in the limiting groove, which is convenient for playing a limiting role.

[0019] Preferably, a second sliding groove is formed in the support rod, and a third compression spring is fixed in the second sliding groove. One end of the third compression spring is fixed with a slider, and the slider is slidably connected in the second sliding groove. The slider penetrates through one end of the support rod.

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

[0021] Preferably, a moving plate is fixed on one side of the slider, and the moving plate penetrates through the other end of the support rod. A rack is fixed on the outer side of the moving 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 circumferentially and evenly distributed on the support rod.

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

[0023] Preferably, a fourth oil storage groove is formed at one end of the rotating rod, and a rubber gasket is fixed in the fourth oil storage groove. An annular pipeline is fixed in the support rod. The four fourth oil storage grooves are all communicated with the annular pipeline through a first connecting pipeline. The top of the annular pipeline is communicated with the third oil storage groove through a second connecting pipeline, and the second connecting pipeline is wound around a winding column.

[0024] By adopting the above technical solution, when the four rotating rods rotate and open and are all pressed against the inner wall of the steel pipe, the rubber gasket is compressed and deformed, so as to press the oil into the third oil storage groove, and the winding column plays a role of winding and storing the redundant second connecting pipeline.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. For the inner diameter measuring device for steel pipe production, through the mutual cooperation of the grip, the top push rod, the scale, the first piston block, the second piston block, the first extrusion rod, the second extrusion rod, the support rod, the slider, the moving plate, the incomplete gear and the rotating rod, the purpose of rapid and accurate measurement can be achieved. After inserting the four rotating rods into the steel pipe, the grip can be held by hand and the top push rod can be pushed rightward. The rightward movement of the first piston block drives the second piston block to move rightward, the first extrusion rod moves rightward, the second extrusion rod moves rightward, the slider and the moving plate move rightward, the incomplete gear rotates to drive the rotating rod to rotate, the four rotating rods rotate and open, and finally the four rotating rods all abut against the inner wall of the steel pipe. The support rod is automatically centered. By observing the scale, the rotation angle of the rotating rod can be known. 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. This device can measure in the center, and the measurement is rapid and accurate.

[0026] 2. For the inner diameter measuring device for steel pipe production, through the mutual cooperation of the top push rod, the movable block, the toothed plate, the third oil storage groove, the third piston block, the block, the rotating rod, the fourth oil storage groove and the rubber gasket, the purpose of accurate reading through locking can be achieved. When the four rotating rods rotate and open and abut against the inner wall of the steel pipe, the rubber gasket is extruded and deformed by the inner wall of the steel pipe, and the hydraulic oil in the four fourth oil storage grooves is all pressed into the third oil storage groove. The third piston block and the block move rightward and unlock the movable block, and the movable block and the toothed plate automatically bounce down and lock the top push rod. Locking first and then reading can make the reading result more accurate.

[0027] 3. The inner diameter measuring device for steel pipe production can achieve the purpose of deep measurement and convenient storage through the combined use of the grip, pipe winding column, pressing plate, limiting column, extension rod, support rod, and second connecting pipe. Multiple extension rods can be installed between the grip and the support rod to facilitate the measurement of the inner diameter of the deep part of the steel pipe. The number of installed extension rods can be determined according to specific requirements. The redundant second connecting pipes can be wound around the pipe winding column for convenient storage. The pressing plate and the limiting column are used in combination to press and limit the second connecting pipes on the pipe winding column. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a three-dimensional structural schematic diagram of the present invention; Figure 2 is a front view sectional structural schematic diagram of the present invention; Figure 3 is a structural schematic diagram of the inner diameter measuring mechanism of the present invention; Figure 4 is a structural schematic diagram of the connection between the pressing plate and the limiting column of the present invention; Figure 5 is a structural schematic diagram of the connection between the support rod, the second sliding groove, the third compression spring, the moving plate, the rack, the first connecting pipe, and the second connecting pipe of the present invention; Figure 6 of the present invention Figure 2 is an enlarged structural schematic diagram at A in; Figure 7 of the present invention Figure 2 is an enlarged structural schematic diagram at B in.

[0029] In the figure: 1. Handheld pushing mechanism; 101. Grip; 102. Push rod; 103. Scale; 104. Tooth groove; 105. First piston block; 106. First oil storage tank; 107. Second oil storage tank; 108. Second piston block; 109. First extrusion rod; 110. First sliding groove; 111. Movable block; 112. Pulling ring; 113. Tooth plate; 114. First compression spring; 115. Third oil storage tank; 116. Second compression spring; 117. Third piston block; 118. Block; 119. Pipe winding column; 120. Pressing plate; 121. Limiting column; 2. Extension rod; 3. Fixed bolt; 4. Limiting groove; 5. Second extrusion rod; 6. Limiting block; 7. Inner diameter measuring mechanism; 701. Support rod; 702. Second sliding groove; 703. Third compression spring; 704. Slide block; 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 OF THE EMBODIMENTS

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0031] Please refer to Figures 1 to 7 , the present invention provides a technical solution: an inner diameter measuring device for steel pipe production, including a hand-held pushing mechanism 1. The hand-held pushing mechanism 1 includes a grip 101. One end of the grip 101 is penetrated by a push rod 102. One end of the push rod 102 is fixed with a first piston block 105. A first oil storage tank 106 is opened in the grip 101. The first piston block 105 is slidably connected in the first oil storage tank 106. A second oil storage tank 107 is opened in the grip 101. The second oil storage tank 107 communicates with the end of the first oil storage tank 106. A second piston block 108 is slidably connected in the second oil storage tank 107. One side of the second piston block 108 is fixed with a first extrusion rod 109. The first extrusion rod 109 penetrates through the other end of the grip 101.

[0032] The other end of the grip 101 is fixed with an extension rod 2 through a fixing bolt 3. 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 with an incomplete gear 707. One side of the incomplete gear 707 is fixed with a rotating rod 708.

[0033] In this embodiment, as Figure 1 , Figure 2 and Figure 6 shown, a scale 103 is fixed on the upper end surface of the push rod 102. A tooth groove 104 is opened on the upper end surface of the push rod 102, and the tooth grooves 104 are equally 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. 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.

[0034] In this embodiment, as Figure 1 , Figure 2 and Figure 6As shown, a first sliding groove 110 is provided in the grip 101, and a movable block 111 is slidably connected in the first sliding groove 110. A lifting ring 112 is fixed to the top of the movable block 111, and the lifting ring 112 penetrates through the top of the grip 101. A toothed plate 113 is fixed to the bottom of the movable block 111, and the toothed plate 113 is connected to the grip 101 through a first compression spring 114. The first compression spring 114 is initially in a compressed state. After unlocking the movable block 111, the movable block 111 and the toothed plate 113 automatically bounce downward under the action of the first compression spring 114, and the toothed plate 113 is stuck into the corresponding tooth groove 104, facilitating the locking of the top push rod 102. When the lifting ring 112 is held by hand and pulled upward to drive the movable block 111 and the toothed plate 113 and make the toothed plate 113 leave the tooth groove 104, the top push rod 102 can be unlocked.

[0035] In this embodiment, as Figure 2 and Figure 6 shown, a third oil storage tank 115 is provided in the grip 101, and a second compression spring 116 is fixed in the third oil storage tank 115. One end of the second compression spring 116 is fixed with a third piston block 117, and the third piston block 117 is slidably connected in the third oil storage tank 115. A clamping block 118 is fixed to one side of the third piston block 117, and the clamping block 118 is snap-connected to the movable block 111. The second compression spring 116 plays a role in propping up 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, facilitating the unlocking of the movable block 111, and the movable block 111 and the toothed plate 113 will automatically bounce downward under the first compression spring 114.

[0036] In this embodiment, as Figure 1 、 Figure 2 and Figure 4 shown, a pipe winding column 119 is fixed to the top of the grip 101, and a pressing plate 120 is sleeved on the outer side of the pipe winding column 119. A limiting column 121 is fixed to the bottom of the pressing plate 120, and the limiting column 121 is snap-connected to the top of the grip 101. The bottom of the limiting column 121 is made of rubber. There are four limiting columns 121, and the four limiting columns 121 are circumferentially and evenly distributed on the pressing plate 120. The pipe winding column 119 can be used to wind and store the storage component. After the storage work is completed, the pressing plate 120 can be sleeved on the outer side of the pipe winding column 119 to press the pipe, and at the same time, the limiting column 121 is stuck on the top of the grip 101, facilitating the fixing of the pressing plate 120.

[0037] In this embodiment, as Figure 2As shown, a second extrusion rod 5 penetrates through the extension rod 2, and a limit block 6 is fixed on the outer side of the second extrusion rod 5. A limit groove 4 is formed in the extension rod 2, and the limit block 6 is slidably connected in the limit groove 4. Multiple extension rods 2 can be installed between the grip 101 and the support rod 701 through the fixing bolt 3. The number of installed extension rods 2 can be determined according to specific requirements. Multiple extension rods 2 can be spliced and assembled together through 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 limit block 6 slides in the limit groove 4, which is convenient for playing a limiting role.

[0038] In this embodiment, as Figure 2 and Figure 7 shown, a second sliding groove 702 is formed in the support rod 701, and a third compression spring 703 is fixed in the second sliding groove 702. One end of the third compression spring 703 is fixed with a slider 704, and the slider 704 is slidably connected in the second sliding groove 702. One end of the slider 704 penetrates through the support rod 701. When the second extrusion rod 5 moves to the right, it will squeeze the slider 704 to move to the right. The third compression spring 703 can assist the slider 704 to reset.

[0039] In this embodiment, as Figure 2 、 Figure 3 and Figure 7 shown, a moving plate 705 is fixed on one side of the slider 704, and the moving plate 705 penetrates through the other end of the support rod 701. A rack 706 is fixed on the outer side of the moving 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 circumferentially and evenly distributed on the support rod 701. When the slider 704 moves to the right, it will drive the moving plate 705 to move to the right. Since the rack 706 is meshed and connected to the incomplete gear 707, the four incomplete gears 707 can rotate as the moving plate 705 moves, thereby driving the rotating rod 708 to rotate. The four rotating rods 708 open and abut against the inner wall of the steel pipe, and the grip 101, the extension rod 2 and the support rod 701 will automatically be centered.

[0040] In this embodiment, as Figure 2 、 Figure 3 、 Figure 5 and Figure 7As shown, one end of the rotating rod 708 is provided with a fourth oil storage tank 709, and a rubber gasket 710 is fixed in the fourth oil storage tank 709. An annular pipeline 712 is fixed in the support rod 701. The four fourth oil storage tanks 709 are all communicated with the annular pipeline 712 through the first connecting pipelines 711. The top of the annular pipeline 712 is communicated with the third oil storage tank 115 through the second connecting pipeline 713, and the second connecting pipeline 713 is wound around the winding column 119. The first connecting pipelines 711, the annular pipeline 712 and the second connecting pipeline 713 play a role in connecting the third oil storage tank 115 and the four fourth oil storage tanks 709. After the four rotating rods 708 rotate and open, the rubber gasket 710 abuts against the inner wall of the steel pipe. The rubber gasket 710 is extruded 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. Under the action of the oil pressure, the third piston block 117 moves to the right, and the latch 118 moves to the right accordingly to unlock the movable block 111. The movable block 111 and the ratchet plate 113 automatically bounce down and lock the push rod 102. Subsequently, the rotation angle of the rotating rod 708 can be understood by observing the scale 103. Fixing the push rod 102 and then taking the reading can make the reading result more accurate. The winding column 119 plays a role in winding and storing the redundant second connecting pipeline 713.

[0041] The usage method and advantages of the present invention: The inner diameter measuring device for steel pipe production works as follows: As Figures 1 to 7As shown: First, assemble the corresponding number of extension rods 2 between the grip 101 and the support rod 701 according to requirements. Then, wind the redundant second connecting pipe 713 around the pipe winding column 119. Sleeve the pressure plate 120 outside the pipe winding column 119 and use the limit post 121 to limit the second connecting pipe 713 on the pipe winding column 119, and then clamp the limit post 121 on the grip 101. Extend the four rotating rods 708 to the specified depth of the steel pipe. Hold the grip 101 with one hand and push the top push rod 102 to the right with the other hand. The first piston block 105 moves to the right. The second piston block 108 moves to the right under the action of hydraulic 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 rightward 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, which can play a limiting role. The slider 704 and the moving plate 705 move to the right under the extrusion of the second extrusion rod 5. Since the rack 706 is meshed and connected with the incomplete gear 707, the rotation of the incomplete gear 707 drives the rotating rod 708 to rotate. The four rotating rods 708 open, and finally all four rotating rods 708 abut against the inner wall of the steel pipe. The grip 101, the extension rod 2, and the support rod 701 are automatically centered. The rubber gasket 710 is deformed by the extrusion of the inner wall of the steel pipe, so as to press 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 hydraulic pressure, and the latch 118 moves to the right accordingly 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 clamped into the corresponding tooth groove 104, and the top 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.

[0042] In summary, the inner diameter measuring device for steel pipe production achieves the purposes of rapid and accurate measurement, accurate reading through locking, deep measurement through splicing and assembly, and convenient storage, meeting people's usage requirements.

[0043] The above shows and describes the basic principles, main features and advantages of the present invention. Technical staff in this industry should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions in the specification are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

[0044] The orientation or positional relationship indicated by terms such as "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of simplifying the description of the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation on the protected content of the present invention.

[0045] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An inner diameter measuring device for steel pipe production, comprising a hand-held pushing mechanism (1), characterized in that: The handheld pushing mechanism (1) includes a grip (101). One end of the grip (101) is penetrated by a push rod (102). One end of the push rod (102) is fixed with a first piston block (105). A first oil storage tank (106) is formed in the grip (101). The first piston block (105) is slidably connected in the first oil storage tank (106). A second oil storage tank (107) is formed in the grip (101). The second oil storage tank (107) communicates with the end of the first oil storage tank (106). A second piston block (108) is slidably connected in the second oil storage tank (107). One side of the second piston block (108) is fixed with a first extrusion rod (109). The first extrusion rod (109) penetrates the other end of the grip (101). The other end of the grip (101) is fixed with an extension rod (2) through a fixing bolt (3). 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 with an incomplete gear (707). One side of the incomplete gear (707) is fixed with a rotating rod (708).

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). Tooth grooves (104) are formed on the upper end surface of the push rod (102), and the tooth grooves (104) are evenly distributed on the push rod (102) at equal intervals.

3. The inner diameter measuring device for steel pipe production according to claim 1, wherein: A first sliding groove (110) is formed in the grip (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) penetrates the top of the grip (101). A tooth engaging plate (113) is fixed on the bottom of the movable block (111), and the tooth engaging plate (113) is connected with the grip (101) through a first compression spring (114).

4. An inner diameter measuring device for steel pipe production according to claim 3, characterized in that: A third oil storage tank (115) is formed in the grip (101), and a second compression spring (116) is fixed in the third oil storage tank (115). One end of the second compression spring (116) is fixed with a third piston block (117), and the third piston block (117) is slidably connected in the third oil storage tank (115). One side of the third piston block (117) is fixed with a clamping block (118), and the clamping block (118) is clamped and connected to the movable block (111).

5. The inner diameter measuring device for steel pipe production according to claim 4, characterized in that: A pipe winding column (119) is fixed on the top of the grip (101), and a pressing plate (120) is sleeved on the outer side of the pipe winding column (119). A limiting column (121) is fixed on the bottom of the pressing plate (120), and the limiting column (121) is clamped and connected to the top of the grip (101). The bottom of the limiting column (121) is made of rubber material. There are four limiting columns (121), and the four limiting columns (121) are circumferentially and evenly distributed on the pressing plate (120).

6. 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 formed in the extension rod (2), and the limiting block (6) is slidably connected in the limiting groove (4).

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

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

9. The inner diameter measuring device for steel pipe production according to claim 5, characterized in that: A fourth oil storage tank (709) is formed at one end of the rotating rod (708), and a rubber gasket (710) is fixed in the fourth oil storage tank (709). An annular pipeline (712) is fixed in the support rod (701). The four fourth oil storage tanks (709) are all communicated with the annular pipeline (712) through a first connecting pipeline (711). The top of the annular pipeline (712) is communicated with the third oil storage tank (115) through a second connecting pipeline (713), and the second connecting pipeline (713) is wound around a winding column (119).

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