Engineering plastic pipe trepanning positioning device

Abstract

The engineering plastic pipe trepanning positioning device comprises a positioning mechanism, a bandage and a measuring scale, and the measuring scale is located at the edge of the end face of one side of the positioning mechanism; an output port is formed in the edge of the bottom end of one side of the positioning mechanism, and the bandage is inserted into the output port in a penetrating mode; the positioning mechanism comprises a winding mechanism and a first measuring mechanism, one end of the bandage surrounds the winding mechanism, the first measuring mechanism is located on one side of the winding mechanism, the surface of the bandage is attached to the outer portion of the first measuring mechanism, and the first measuring mechanism measures the moving length of the bandage. According to the invention, holes with specific included angles on the same pipeline can be positioned, the problem of angle measurement of the pipeline before trepanning operation is solved, the positions of the holes are more accurate, and the requirements of practical application are met.

Description

Technical Field

[0001] The invention relates to the technical field of plastic pipe processing, in particular to a hole-opening positioning device for an engineering plastic pipe. Background Art

[0002] Engineering plastic pipes are a type of pipe made of high-performance polymer materials, with polypropylene, polyethylene, polybutylene, chlorinated polyvinyl chloride, polyvinylidene fluoride and other materials as the main raw materials. They have the advantages of excellent chemical corrosion resistance, light weight, excellent fluid conveying characteristics, good mechanical properties, etc. They are widely used in modern industry, construction, infrastructure and other fields, and are gradually replacing traditional metal pipes.

[0003] During the processing or actual construction of engineering plastic pipes, it may be necessary to drill holes in the pipe surface to add flow channels or install testing equipment. Existing pipe drilling operations typically require measuring the pipe's outer wall to locate the hole and facilitate subsequent drilling operations.

[0004] However, when performing multiple hole drilling operations on the same pipeline, due to the special shape of the pipeline, operators can only quickly measure the spacing of the hole drilling positions along the pipeline axis. If the hole drilling axis is at a specific angle with the pipeline radial direction, operators need to perform multiple measurements and calculations to obtain the required angle data. For example, operators need to first measure the diameter of the pipeline outer wall, then measure the required deflection arc length along the pipeline wall, and then calculate the deflection angle corresponding to the arc length; or calculate the corresponding arc length along the pipeline wall from the required angle. Traditional measuring tools are prone to errors when measuring arc length on smooth pipeline walls, which can easily lead to calculation deviations, resulting in deviations from the expected position of subsequent holes, affecting the actual use of the pipeline. The measurement and calculation operations also increase the difficulty of hole positioning. Summary of the Invention

[0005] The object of the present invention is to provide a device for positioning a hole in an engineering plastic pipe to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solutions: a device for positioning a hole in an engineering plastic pipe, comprising a positioning mechanism, a binding strap, and a measuring ruler, wherein the measuring ruler is located at an edge of one end face of the positioning mechanism;

[0007] An output port is provided on the bottom edge of one side of the positioning mechanism, and the binding strap is inserted into the output port;

[0008] The positioning mechanism includes a winding mechanism and a first measuring mechanism, one end of the strap is wrapped around the outside of the winding mechanism, the first measuring mechanism is located on one side of the winding mechanism, and the surface of the strap is attached to the outside of the first measuring mechanism, and the first measuring mechanism measures the moving length of the strap;

[0009] The first measuring mechanism includes a first rotary encoder and a plurality of first measuring wheels;

[0010] The first measuring wheels are respectively connected to the first rotary encoders, and the binding belts are wrapped around the surfaces of the first measuring wheels;

[0011] The positioning mechanism further includes a processor, and the first rotary encoder is electrically connected to the processor.

[0012] Preferably, the bottom surface of the positioning mechanism is a curved surface;

[0013] The binding strap is made of non-elastic flexible material.

[0014] Preferably, the winding mechanism comprises a winding wheel, a torsion spring and a rotating shaft, the winding wheel is sleeved on the outside of the rotating shaft, and both ends of the rotating shaft are rotatably arranged on the side wall of the positioning mechanism;

[0015] The two ends of the torsion spring are respectively connected to the inner wall of the reel and the outer wall of the rotating shaft;

[0016] One end of the binding belt is fixed and wrapped around the surface of the winding wheel, and the width of the binding belt is less than or equal to the width of the winding space on the outer wall of the winding wheel.

[0017] Preferably, the surface of the first measuring wheel is provided with evenly distributed first anti-slip strips.

[0018] Preferably, a limiting rod is provided at one end of the strap away from the winding mechanism, and the length of the limiting rod is greater than the width of the output port.

[0019] Preferably, limit buckles are respectively provided at both ends of the output port, and a slot for placing the limit rod is formed between the limit buckles and the outer wall of the positioning mechanism;

[0020] A groove is formed on the bottom surface of the positioning mechanism, and the depth of the groove is greater than or equal to the thickness of the strap;

[0021] The groove is provided with limiting grooves for placing limiting rods on both sides of one end close to the output port;

[0022] The inner wall widths of the clamping slot and the limiting slot are greater than or equal to the outer wall diameter of the limiting rod;

[0023] A plurality of notches are formed on the bottom surface of the positioning mechanism, and the notches are respectively located on both sides of the groove.

[0024] Preferably, the positioning mechanism further comprises a second measuring mechanism, wherein the measuring portion of the second measuring mechanism protrudes from the outer wall of the bottom end of the positioning mechanism;

[0025] The second measuring mechanism includes a second rotary encoder and a plurality of second measuring wheels;

[0026] The second measuring wheels are respectively connected to the second rotary encoders, the second measuring wheels are respectively located inside the slots, and the outer walls of the second measuring wheels protrude from the openings of the slots;

[0027] The surfaces of the second measuring wheels are respectively provided with evenly distributed second anti-slip strips.

[0028] Preferably, the positioning mechanism further includes a power supply module and an interaction module;

[0029] The interaction module is arranged on the surface of the positioning mechanism, and the processor and the interaction module are electrically connected to the power supply module respectively;

[0030] The second rotary encoder is electrically connected to the processor, and both the first rotary encoder and the second rotary encoder are electrically connected to the power supply module.

[0031] Preferably, a charging port is provided on one side of the power supply module.

[0032] Preferably, the interaction module includes a display screen and a plurality of buttons, and the display screen and the buttons are electrically connected to the processor respectively.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] 1. The present invention achieves the effects of accurate measurement of radial angles and arc lengths and automatic calculation by providing a positioning mechanism. The pipe diameter and deflection angle can be measured by the first measuring mechanism and the second measuring mechanism respectively. The processor automatically brings the measured data into the calculation formula for automatic calculation, and the required data can be quickly obtained. The radial deflection angle of the pipe between the opening axes can be accurately and quickly located, providing accurate positioning data for subsequent pipe opening, reducing the difficulty of the opening operation while also ensuring the accuracy of the pipe opening.

[0035] 2. The present invention achieves the effect of improving the convenience of use by setting a winding mechanism. The winding mechanism can store the straps, avoiding the impact of the straps on people carrying them when not in use. In actual use, the positioning mechanism is small in size, which is convenient for people to operate by hand. It can not only be used for pipes of different diameters, but also for pipes placed in different positions, and has greater flexibility in actual application. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic diagram of the appearance structure of the present invention;

[0037] Figure 2 This is a schematic diagram of the appearance structure of the positioning mechanism of the present invention;

[0038] Figure 3 This is a schematic diagram of the cross-sectional structure of the output port of the present invention;

[0039] Figure 4 This is a schematic diagram of the exploded structure of the components of the present invention;

[0040] Figure 5 This is a schematic diagram of the connection structure between the limiting rod and the binding strap of the present invention;

[0041] Figure 6 This is a schematic diagram of the exploded structure of the positioning mechanism components of the present invention;

[0042] Figure 7 Schematic diagram of the internal structure of the positioning mechanism of the present invention;

[0043] Figure 8 It is a partially enlarged structural schematic diagram of the winding mechanism of the present invention;

[0044] Figure 9 This is a schematic diagram of the internal top view of the positioning mechanism of the present invention;

[0045] Figure 10 It is a bottom view structural diagram of the positioning mechanism of the present invention;

[0046] Figure 11 This is a schematic diagram of the main cross-sectional structure of the positioning mechanism of the present invention;

[0047] Figure 12 This is a schematic diagram of the cross-sectional structure of the notch of the present invention;

[0048] Figure 13 This is a schematic diagram of the combination structure of the limiting rod and the card slot of the present invention;

[0049] Figure 14 It is a schematic diagram of the combined structure of the limiting rod and the limiting groove of the present invention.

[0050] In the picture:

[0051] 100, positioning mechanism; 101, output port; 102, limit buckle; 1021, card slot; 103, notch; 104, groove; 105, limit slot;

[0052] 110. Winding mechanism; 111. Winding wheel; 112. Torsion spring; 113. Rotating shaft;

[0053] 120, first measuring mechanism; 121, first rotary encoder; 122, first measuring wheel; 1221, first anti-slip strip;

[0054] 130. Second measuring mechanism; 131. Second rotary encoder; 132. Second measuring wheel; 1321. Second anti-slip strip;

[0055] 140, processor; 150, power supply module; 151, charging port; 160, interaction module; 161, display screen; 162, button;

[0056] 200, strap; 201, limit rod;

[0057] 300. Measuring ruler. DETAILED DESCRIPTION

[0058] 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. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0059] See also Figures 1 to 14 , the present invention provides the following two embodiments:

[0060] Example 1:

[0061] See also Figure 1 A device for positioning holes in an engineering plastic pipe includes a positioning mechanism 100, a binding strap 200, and a measuring ruler 300. The measuring ruler 300 is located at the edge of one end face of the positioning mechanism 100. The measuring ruler 300 is used to measure the axial distance of the pipe and control the spacing of multiple holes in the axial direction of the pipe.

[0062] It is worth noting that the edge of the measuring ruler 300 is flush with the edge of the housing of the positioning mechanism 100 , and a scale is provided on the surface of the measuring ruler 300 .

[0063] Secondly, the bottom surface of the positioning mechanism 100 is a curved surface, which is used to fit the circular surface of the pipe and improve the fit. The bandage 200 is made of non-elastic flexible material, which allows the bandage 200 to completely fit the outer wall of the pipe, accurately measuring the arc length of the pipe outer wall and improving the fit.

[0064] See also Figures 2 to 4 An output port 101 is provided at the bottom edge of one side of the positioning mechanism 100 , and the strap 200 is inserted into the output port 101 .

[0065] Specifically, one end of the strap 200 extends out of the positioning mechanism 100 through the output port 101, making it easy for the operator to pull out the strap 200 and measure the length of the strap 200 pulled out, which is used to measure the arc length of the positioning mechanism 100 deflected along the pipe surface and calculate the deflection angle.

[0066] The positioning mechanism 100 includes a winding mechanism 110 and a first measuring mechanism 120 . One end of the strap 200 is wrapped around the outside of the winding mechanism 110 . The first measuring mechanism 120 is located on one side of the winding mechanism 110 , and the surface of the strap 200 is attached to the outside of the first measuring mechanism 120 .

[0067] The positioning mechanism 100 stores the strap 200 through the reeling mechanism 110, and the resilient force of the reeling mechanism 110 retracts the extended strap 200, minimizing the risk of the strap 200 extending beyond the positioning mechanism 100 and hindering portability. Furthermore, when the strap 200 extends beyond the positioning mechanism 100, the first measuring mechanism 120 measures the distance traveled by the strap 200, thereby obtaining data on the pipeline or the arc length of the deflection of the positioning mechanism 100.

[0068] For details, please refer to Figures 6 to 9 The winding mechanism 110 includes a winding wheel 111, a torsion spring 112 and a rotating shaft 113. The winding wheel 111 is sleeved on the outside of the rotating shaft 113. The two ends of the rotating shaft 113 are rotatably set on the side wall of the positioning mechanism 100. The two ends of the torsion spring 112 are respectively connected to the inner wall of the winding wheel 111 and the outer wall of the rotating shaft 113.

[0069] When the strap 200 is pulled out, the winding wheel 111 is driven to rotate. During the rotation of the winding wheel 111, the torsion spring 112 is driven to contract, increasing the elastic potential energy of the torsion spring 112. When the strap 200 is in a free state, the torsion spring 112 drives the winding wheel 111 to reverse through the stored elastic potential energy, thereby retracting the pulled-out strap 200, reducing the impact on carrying and operation caused by the strap 200 extending out of the positioning mechanism 100.

[0070] One end of the strap 200 is fixed and wrapped around the surface of the winding wheel 111, and the width of the strap 200 is less than or equal to the width of the winding space on the outer wall of the winding wheel 111. Specifically, the width of the winding space of the winding wheel 111 matches the width of the strap 200, which can avoid the problem of deviation of the strap 200 when it is wound on the winding wheel 111.

[0071] It is worth noting that see Figure 5A limiting rod 201 is provided at one end of the strap 200 away from the winding mechanism 110. The length of the limiting rod 201 is greater than the width of the output port 101, and is used to prevent the strap 200 from completely entering the interior of the positioning mechanism 100 and affecting the normal use of the positioning mechanism 100.

[0072] See also Figure 6 、 Figure 7 and Figure 9 The first measuring mechanism 120 includes a first rotary encoder 121 and a plurality of first measuring wheels 122 . The first measuring mechanism 120 is used to measure the moving length of the strap 200 .

[0073] Specifically, the first measuring wheels 122 are respectively connected to the first rotary encoders 121 , and the strap 200 surrounds and clings to the surface of the first measuring wheels 122 .

[0074] After the strap 200 is pulled out, the contact portion of the strap 200 with the first measuring wheel 122 drives the first measuring wheel 122 to rotate due to friction. When the first measuring wheel 122 rotates, it can drive the first rotary encoder 121 to rotate. The first rotary encoder 121 measures the rotation angle and number of rotations of the first measuring wheel 122. Combined with the circumference of the outer wall of the first measuring wheel 122, the length of the strap 200 pulled out is obtained. After the strap 200 is pulled out of the output port 101, it fits the surface of the pipe, and the outer circumference or arc length of the pipe is obtained.

[0075] The surface of the first measuring wheel 122 is provided with evenly distributed first anti-slip strips 1221. The first anti-slip strips 1221 are used to increase the friction between the first measuring wheel 122 and the strap 200, reduce the risk of slipping between the strap 200 and the first measuring wheel 122, and ensure the accuracy of the measurement.

[0076] See also Figure 6 The positioning mechanism 100 also includes a processor 140 , a power supply module 150 , and an interaction module 160 .

[0077] The first rotary encoder 121 is electrically connected to the processor 140 and the power supply module 150. The processor 140 is used to receive the output data of the first rotary encoder 121. At the same time, the operator can input data through the interactive module 160. The processor 140 can process the data and output the result of the preset calculation process. At the same time, the power supply module 150 provides power for the first rotary encoder 121. A charging port 151 is provided on one side of the power supply module 150. The charging port 151 facilitates the replenishment of power to the power supply module 150, freeing it from the constraints of the power cord and improving the flexibility of practical applications.

[0078] The interaction module 160 is disposed on the surface of the positioning mechanism 100 , and the processor 140 and the interaction module 160 are electrically connected to the power supply module 150 , respectively.

[0079] Specifically, the interactive module 160 includes a display screen 161 and a plurality of buttons 162, and the display screen 161 and the buttons 162 are respectively electrically connected to the processor 140. The interactive module 160 can facilitate the operator to input and read data, and facilitate actual operation.

[0080] Specifically, when locating a hole in a pipe with a known diameter:

[0081] The operator inputs the pipe diameter value through the key 162 in the interactive module 160, places the positioning mechanism 100 on the pipe surface, and keeps the edge of the measuring ruler 300 parallel to the pipe axis.

[0082] Then, the limiting rod 201 of the strap 200 is positioned on the surface of the pipe, and the handheld positioning mechanism 100 is deflected along the surface of the pipe. During this process, the strap 200 is released from the winding wheel 111 and drives the first measuring wheel 122 to rotate. The first rotary encoder 121 detects the number of rotations and angles of the first measuring wheel 122 and outputs the number of pulses. Combined with the effective circumference of the first measuring wheel 122 pre-input into the processor 140, the processor 140 multiplies the effective circumference of the first measuring wheel 122 by the number of rotations and adds the effective arc length of the outer wall of the first measuring wheel 122 rotated at a specific angle to obtain the length output by the strap 200, that is, the arc length of the positioning mechanism 100 deflected along the pipe surface.

[0083] The processor 140 then divides the arc length of the positioning mechanism 100 deflected on the pipe surface by the radius to obtain the radian angle, and then calculates the radian angle to obtain the degree.

[0084] That is, angle = radian angle * (180 / π), thereby obtaining the angle of deflection of the positioning mechanism 100 along the pipe surface. The operator can mark the edge of the measuring ruler 300 and measure the distance between adjacent openings to obtain the opening position axis at a specific angle.

[0085] After drilling, multiple holes with specific angles along the radial direction of the pipeline are obtained. After subsequent drilling operations, multiple holes can be formed on the pipeline surface, and the holes form expected angles in the radial direction of the pipeline.

[0086] It is worth noting that when the pipe diameter and the required deflection angle are known, the pipe wall diameter, pipe wall thickness and deflection angle data can be directly input into the processor 140 , and the arc length data can be output through the processor 140 .

[0087] The operator aligns the edge of the measuring ruler 300 with the required reference point. Specifically, the required reference point is the intersection of the axis of the specific hole position and the surface of the pipe wall. The operator keeps the edge of the measuring ruler 300 parallel to the axis of the pipe. Then, the operator manually pulls out the strap 200 to move it along the pipe wall. The first measuring mechanism 120 detects the length output by the strap 200 in real time until the length output by the strap 200 is the arc length data calculated by the above-mentioned processor 140. A line is drawn on the end of the upper limit rod 201 on the strap 200 to obtain the positioning line of the corresponding deflection angle.

[0088] Example 2:

[0089] Based on the content of the above embodiment 1, another embodiment is proposed:

[0090] See also Figure 2 , limit buckles 102 are respectively provided at both ends of the output port 101, and a slot 1021 for placing the limit rod 201 is formed between the limit buckle 102 and the outer wall of the positioning mechanism 100. The slot 1021 is used to fix the end of the strap 200 through the limit rod 201 after the strap 200 is wrapped around the pipe, so that the strap 200 is sleeved on the surface of the pipe, and cooperates with the first measuring mechanism 120 to measure the moving length of the strap 200 to obtain the circumference of the pipe. The processor 140 obtains the diameter of the pipe by calculation, which is suitable for measuring pipes of unknown diameter.

[0091] See also Figure 10 The bottom surface of the positioning mechanism 100 is provided with a groove 104, the depth of which is greater than or equal to the thickness of the bandage 200. Specifically, the groove 104 is used to receive the bandage 200 to prevent the bandage 200 from affecting the fit between the bottom surface of the positioning mechanism 100 and the surface of the pipe when the bandage 200 is sleeved on the pipe.

[0092] Limiting grooves 105 for placing the limiting rod 201 are provided on both sides of one end of the groove 104 close to the output port 101. The inner wall width of the card slot 1021 and the limiting groove 105 is greater than or equal to the outer wall diameter of the limiting rod 201. The limiting groove 105 is used in conjunction with the limiting rod 201 to prevent the strap 200 from entering the interior of the positioning mechanism 100.

[0093] See also Figure 13 When the bandage 200 is wrapped around the pipe, the limiting rod 201 is placed in the slot 1021 to fix one end of the bandage 200.

[0094] See also Figure 14 When the strap 200 is completely rolled up into the positioning mechanism 100 , the limiting rod 201 is combined with the limiting groove 105 to limit the end of the strap 200 .

[0095] The bottom surface of the positioning mechanism 100 is provided with a plurality of notches 103, which are respectively located on both sides of the groove 104. The notches 103 are used to protrude the second measuring wheel 132 from the bottom surface of the positioning mechanism 100, so that the second measuring wheel 132 can contact the pipe surface for performing measurement operations.

[0096] See also Figure 11 and Figure 12 The positioning mechanism 100 further includes a second measuring mechanism 130 , and a measuring portion of the second measuring mechanism 130 protrudes from the bottom outer wall of the positioning mechanism 100 .

[0097] The second measuring mechanism 130 includes a second rotary encoder 131 and a plurality of second measuring wheels 132 . The second rotary encoder 131 is electrically connected to the processor 140 , and the second rotary encoder 131 is electrically connected to the power supply module 150 .

[0098] The second measuring wheels 132 are connected to the second rotary encoders 131 , respectively. The second measuring wheels 132 are located inside the slots 103 , and outer walls of the second measuring wheels 132 protrude from the openings of the slots 103 .

[0099] The surface of the second measuring wheel 132 is provided with evenly distributed second anti-slip strips 1321 , which are used to increase the friction between the second measuring wheel 132 and the outer wall of the pipe to prevent slipping and affect measurement accuracy.

[0100] When the pipe diameter is unknown or large, the operator can pull out the strap 200, turn the strap 200 from the output port 101 to the groove 104, and wrap around the pipe surface, and engage the limit rod 201 in the card slot 1021 to form a wrap-around type. During this process, the first measuring mechanism 120 measures the moving length of the strap 200 and inputs it into the processor 140. The processor 140 calculates the pipe diameter based on the pipe circumference and temporarily stores it.

[0101] The operator places the positioning mechanism 100 on the surface of the pipe and deflects the holding positioning mechanism 100 along the surface of the pipe. During this process, the second measuring wheel 132 rolls along the surface of the pipe, and the second rotary encoder 131 measures the number of rotations and angle of the second measuring wheel 132 and outputs the number of pulses. Combined with the effective circumference of the second measuring wheel 132 pre-input into the processor 140, the processor 140 multiplies the effective circumference of the second measuring wheel 132 by the number of rotations and adds the effective arc length of the outer wall of the second measuring wheel 132 rotated by a specific angle to obtain the arc length of the positioning mechanism 100 deflected along the surface of the pipe.

[0102] The processor 140 then divides the arc length of the positioning mechanism 100 deflected on the pipe surface by the radius to obtain the radian angle, and then calculates the radian angle to obtain the degree.

[0103] That is, angle = radian angle * (180 / π), thereby obtaining the angle of deflection of the positioning mechanism 100 along the pipe surface. The operator can mark the edge of the measuring ruler 300 and measure the distance between adjacent openings to obtain the opening position axis at a specific angle.

[0104] After drilling, multiple holes with specific angles along the radial direction of the pipeline are obtained. After drilling, multiple holes with specific angles along the radial direction of the pipeline are obtained. After subsequent drilling operations, multiple holes can be formed on the pipeline surface, and the holes form expected angles in the radial direction of the pipeline.

[0105] In summary of the first and second embodiments, both the first rotary encoder 121 and the second rotary encoder 131 can employ the ZT3806 universal rotary encoder, which detects the number of rotations and angles of the first and second measuring wheels 122, 132, respectively, and emits pulses. Accurate length data is obtained by calculating the number of pulses and combining them with the effective circumferences of the first and second measuring wheels 122, 132. Rotary encoders are a mature technology, and their operating principles are not elaborated upon here. Furthermore, those skilled in the art can flexibly select the model and parameters of the rotary encoder based on their specific implementation.

[0106] Secondly, the processor 140 uses a single chip microcomputer, which stores the calculation formulas in the above-mentioned embodiment 1 and embodiment 2. The above-mentioned formulas are common knowledge, and the single chip microcomputer is also a mature existing technology, which will not be elaborated here.

[0107] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A device for positioning a hole in an engineering plastic pipe, characterized by: It comprises a positioning mechanism (100), a binding belt (200) and a measuring ruler (300), wherein the measuring ruler (300) is located at an edge of one end surface of the positioning mechanism (100); An output port (101) is provided at a bottom edge of one side of the positioning mechanism (100), and the binding belt (200) is inserted into the output port (101); The positioning mechanism (100) comprises a reeling mechanism (110) and a first measuring mechanism (120); one end of the strap (200) is wrapped around the outside of the reeling mechanism (110); the first measuring mechanism (120) is located on one side of the reeling mechanism (110); and the surface of the strap (200) is attached to the outside of the first measuring mechanism (120); the first measuring mechanism (120) measures the moving length of the strap (200); The first measuring mechanism (120) includes a first rotary encoder (121) and a plurality of first measuring wheels (122); The first measuring wheels (122) are respectively connected to the first rotary encoders (121), and the binding belt (200) is wrapped around the surface of the first measuring wheels (122); The positioning mechanism (100) further includes a processor (140), and the first rotary encoder (121) is electrically connected to the processor (140).

2. The device for positioning a hole in an engineering plastic pipe according to claim 1, characterized in that: The bottom end surface of the positioning mechanism (100) is a curved surface; The binding strap (200) is made of non-elastic flexible material.

3. The device for positioning a hole in an engineering plastic pipe according to claim 2, characterized in that: The winding mechanism (110) comprises a winding wheel (111), a torsion spring (112) and a rotating shaft (113); the winding wheel (111) is sleeved on the outside of the rotating shaft (113); and both ends of the rotating shaft (113) are rotatably arranged on the side wall of the positioning mechanism (100); The two ends of the torsion spring (112) are respectively connected to the inner wall of the winding wheel (111) and the outer wall of the rotating shaft (113); One end of the binding belt (200) is fixed and wrapped around the surface of the winding wheel (111), and the width of the binding belt (200) is less than or equal to the width of the winding space on the outer wall of the winding wheel (111).

4. The device for positioning a hole in an engineering plastic pipe according to claim 3, characterized in that: The surface of the first measuring wheel (122) is provided with evenly distributed first anti-slip strips (1221).

5. The device for positioning a hole in an engineering plastic pipe according to claim 4, characterized in that: A limiting rod (201) is provided at one end of the binding belt (200) away from the winding mechanism (110), and the length of the limiting rod (201) is greater than the width of the output port (101).

6. The device for positioning a hole in an engineering plastic pipe according to claim 5, characterized in that: Limiting buckles (102) are respectively provided at both ends of the output port (101), and a slot (1021) for placing the limiting rod (201) is formed between the limiting buckle (102) and the outer wall of the positioning mechanism (100); A groove (104) is provided on the bottom surface of the positioning mechanism (100), and the depth of the groove (104) is greater than or equal to the thickness of the binding strap (200); Limiting grooves (105) for placing limiting rods (201) are provided on both sides of one end of the groove (104) close to the output port (101); The inner wall widths of the clamping slot (1021) and the limiting slot (105) are greater than or equal to the outer wall diameter of the limiting rod (201); The bottom surface of the positioning mechanism (100) is provided with a plurality of notches (103), and the notches (103) are respectively located on both sides of the groove (104).

7. The device for positioning a hole in an engineering plastic pipe according to claim 6, characterized in that: The positioning mechanism (100) further comprises a second measuring mechanism (130), wherein a measuring portion of the second measuring mechanism (130) protrudes from an outer wall of a bottom end of the positioning mechanism (100); The second measuring mechanism (130) includes a second rotary encoder (131) and a plurality of second measuring wheels (132); The second rotary encoder (131) is electrically connected to the processor (140), the second measuring wheels (132) are respectively connected to the second rotary encoders (131), the second measuring wheels (132) are respectively located inside the notches (103), and the outer walls of the second measuring wheels (132) protrude from the opening of the notches (103); The surface of the second measuring wheel (132) is respectively provided with evenly distributed second anti-slip strips (1321).

8. The device for positioning a hole in an engineering plastic pipe according to claim 7, characterized in that: The positioning mechanism (100) further includes a power supply module (150) and an interaction module (160); The interaction module (160) is arranged on the surface of the positioning mechanism (100), and the processor (140) and the interaction module (160) are electrically connected to the power supply module (150) respectively; The first rotary encoder (121) and the second rotary encoder (131) are both electrically connected to the power supply module (150).

9. The device for positioning a hole in an engineering plastic pipe according to claim 8, characterized in that: A charging port (151) is provided on one side of the power supply module (150).

10. The engineering plastic pipe hole positioning device according to claim 8, characterized in that: The interactive module (160) includes a display screen (161) and a plurality of buttons (162), and the display screen (161) and the buttons (162) are electrically connected to the processor (140) respectively.

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