Corrugated pipe fixed length measuring device, cutting equipment and method

Abstract

The invention discloses a corrugated pipe fixed-length measuring device, cutting equipment and a method, the corrugated pipe fixed-length measuring device comprises a floating mounting rack capable of floating up and down and at least one roller rotatably mounted on the floating mounting rack, and the roller is in rolling contact with a to-be-cut corrugated pipe to support and measure the movement of the to-be-cut corrugated pipe. An inductive switch and a triggering piece are further installed on the floating installation frame, the triggering piece is hinged to the floating installation frame, and the first end of the triggering piece is configured to be in contact with the peripheral face of the corrugated pipe all the time under the action of the elastic piece so as to move up and down along with wave crests and wave troughs of the corrugated pipe; the inductive switch is configured to send a pulse signal to the outside when the trigger piece moves to a specific position corresponding to the wave crest or the wave trough. The corrugated pipe fixed-length cutting equipment is provided with a control system, pulse signals can be received, the moving length of the corrugated pipe is calculated by counting the pulse signals, and the cutting mechanism is controlled to conduct cutting when the moving length of the corrugated pipe reaches a set value.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of corrugated pipe processing equipment, in particular to a corrugated pipe fixed-length measuring device, cutting equipment and method. BACKGROUND

[0002] Corrugated pipes have a wide range of applications in fluid transportation, mechanical sealing, cable protection, etc. due to their good flexibility and stretchability. As shown in the structure of the corrugated pipe, the corrugated pipe is continuously extruded by an extruder, and each unit contains a flared section, a small corrugated section and a normal corrugated section. The fixed-length cutting of the corrugated pipe is to cut the continuously formed corrugated pipe into a certain length so as to be shipped. The flared section and the small corrugated section at the front end of each unit need to be removed, leaving the normal corrugated section and the flared section at the rear end, so that the length and structure of each finished corrugated pipe meet the requirements. Figure 1

[0003] Referring to CN202222072499.X, the existing cutting equipment usually adopts a double-disc cutting mechanism for cutting. The cutting mechanism has front and rear clamping discs with multiple pairs of telescopic clamps spaced 180 degrees on the clamping discs for clamping and fixing the pipe, and a cutting blade rotates around the pipe to cut the pipe. In the past, the length was indirectly calculated by measuring the number of rotations of the feeding roller by an encoder, but this method cannot eliminate the errors caused by belt slippage or wheel diameter wear, and the precision is limited.

[0004] In addition, the conventional cutting process usually only focuses on the length dimension and does not care about the position of the cutting edge falling on the corrugated pipe in the axial direction. Since the corrugated pipe has a periodic wavy structure, burrs are easily generated at the cutting edge when cutting at the wave peak position where the pipe wall is thin, and the structural strength at this position is relatively low. If subsequent connection (such as welding or sleeving) is performed at this position, it may affect the firmness and sealing of the connection. On the other hand, for a micro corrugated pipe with a small wave height, the profile fluctuation is not obvious, and the existing mechanical contact type measurement or ordinary photoelectric detection mechanism cannot accurately and stably identify the wave peak and wave valley position due to insufficient sensitivity, which makes it difficult to achieve cutting based on position optimization.

[0005] Therefore, there is an urgent need in the art for an equipment that can directly and accurately measure the actual length of the corrugated pipe, automatically identify and optimize the cutting position, and at the same time has good adaptability and stability. SUMMARY

[0006] The present application aims to solve the problems of insufficient cutting precision and unstable cutting position in the prior art. The present application provides a corrugated pipe fixed-length measuring device, cutting equipment and method.

[0007] ​To achieve the above object, the application adopts the following technical scheme: A corrugated pipe fixed-length measuring device comprises a floating mounting frame capable of floating up and down, at least one roller rotatably mounted on the floating mounting frame, the roller being in rolling contact with a corrugated pipe to be cut to support and measure the movement of the corrugated pipe, and a sensing switch and a trigger being further mounted on the floating mounting frame, the trigger being hingedly connected to the floating mounting frame and being configured such that a first end thereof is always in contact with the outer circumferential surface of the corrugated pipe under the action of an elastic member to follow the fluctuation of the corrugated pipe, and the sensing switch being configured to send an impulse signal to the outside when the trigger moves to a specific position corresponding to a wave crest or a wave trough.

[0008] In a possible implementation, the fixed-length measuring device further comprises a fixed mounting frame and a pneumatic cylinder fixedly assembled on the mounting frame, and the floating mounting frame is fixedly connected to the piston rod of the pneumatic cylinder.

[0009] In a possible implementation, a pair of the rollers are symmetrically mounted on the floating mounting frame, and the trigger is located between the pair of rollers.

[0010] In a possible implementation, the fixed-length measuring device further comprises a spring for providing a pulling force to make one end of the trigger always in contact with the surface of the corrugated pipe.

[0011] In a possible implementation, the trigger is a rod-shaped member, a first end of which constitutes a detection end capable of fitting the profile of a wave trough of the corrugated pipe, and a second end of which constitutes a shielding end with an increased surface area, and the sensing switch is a photoelectric switch, a light path of which intersects the movement track of the shielding end.

[0012] In a possible implementation, the floating mounting frame further has an arc-shaped groove plate, an arc-shaped groove is formed in the arc-shaped groove plate, the sensing switch is slidably mounted in the arc-shaped groove, the arc-shaped groove is located at the side of the trigger, and the arc-shaped groove is opposite to the movement track of the shielding end of the trigger.

[0013] In a possible implementation, the trigger is rotatably mounted on the floating mounting frame through a hinge shaft, the hinge shaft is close to the lower part of the floating mounting frame, one end of the spring is connected to the trigger through a first pin, the other end of the spring is fixedly connected to the upper part of the floating mounting frame, the hinge shaft is located between the detection end and the first pin, and the distance from the detection end to the hinge shaft is less than the distance from the hinge shaft to the first pin.

[0014] The application further provides a corrugated pipe fixed-length cutting device, which comprises:

[0015] a rack;

[0016] A cutting mechanism is installed on the frame, having a clamping mechanism for clamping the bellows and a cutting knife;

[0017] The length measuring device is located upstream of the cutting mechanism;

[0018] A control system is connected to the inductive switch and the cutting mechanism, configured to receive the pulse signal, calculate the moving length of the bellows by counting the pulse signal, and control the cutting mechanism to cut when the moving length reaches a set value.

[0019] In a possible implementation, the control system is configured to control the cutting mechanism to cut when the set length is reached according to the pulse signal counting, and the current pulse signal corresponds to the valley position determined by the trigger position.

[0020] The application also provides a cutting method of the bellows length cutting device, comprising the following steps:

[0021] The first end of the trigger is in floating contact with the outer circumferential surface of the continuously conveyed bellows under the action of elasticity, and follows the fluctuation of the bellows crest and valley, the movement of the first end of the trigger to a specific position of the bellows crest or valley is detected by the inductive switch, and a periodic pulse signal is generated correspondingly;

[0022] The control system receives the pulse signal, and calculates the moving length of the bellows based on the counting result of the pulse signal;

[0023] When the moving length reaches a set value, it is further judged whether the current pulse signal corresponds to the valley position, if yes, the cutting is triggered immediately, if not, the cutting of the bellows by the cutting mechanism is triggered when the next pulse signal corresponding to the valley position arrives. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 A perspective view of a length measuring device provided by an embodiment of the application.

[0025] Figure 2 A schematic view of a length measuring device provided by an embodiment of the application (initial measurement position).

[0026] Figure 3 A schematic view of the bellows in a cutting position.

[0027] Figure 4 A schematic view of the detection end of the trigger in a valley position.

[0028] Figure 5A schematic view for the detection end of the trigger being at a wave peak position.

[0029] Figure 6 A schematic view of a cutting device provided by an embodiment of the present application.

[0030] 100, finished corrugated pipe; 10, front flared section; 11, small corrugated section; 12, normal corrugated section; 121, wave peak; 122, wave trough; 13, rear flared section; 200, fixed-length measuring device; 201, floating mounting frame; 2011, arc-shaped slot plate; 2012, fixed mounting frame; 2013, arc-shaped slot; 202, roller; 203, inductive switch; 204, trigger; 2041, detection end; 2042, shielding end; 205, air cylinder; 2051, piston rod; 206, spring; 207, hinge shaft; 208, first pin; 300, cutting mechanism; 301, first cutting knife; 302, second cutting knife; 400, rack; 401, carrier roller; 402, bracket; 403, first clamping mechanism; 404, second clamping mechanism. DETAILED DESCRIPTION

[0031] To clearly illustrate the technical content, structural features, purposes and effects of the present application, the technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. In the following description, for the purpose of explanation, many specific details are set forth in order to provide a thorough understanding of various exemplary embodiments or implementations of the present application. However, various exemplary embodiments can also be implemented without these specific details or in one or more equivalent arrangements. In addition, various exemplary embodiments can be different, but not necessarily exclusive. For example, the specific shape, structure and characteristics of an exemplary embodiment can be used or implemented in another exemplary embodiment without departing from the inventive concept.

[0032] Hereinafter, the terms "first", "second", and the like are used only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second", and the like can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0033] The "up", "down" positional relationship described in the specification corresponds to the up, down positional relationship in Figure 2 , in addition, Figures 2-5 The direction indicated by the arrow in is the moving direction of the corrugated pipe, and the direction indicated by the arrow is "front", and vice versa.

[0034] In the present application, unless otherwise explicitly specified and limited, the term "connection" should be understood broadly, for example, "connection" can be fixed connection, or detachable connection, or integral; can be directly connected, or indirectly connected through intermediate medium.

[0035] As shown in Figure 1 、 2 , the corrugated pipe to be cut is usually continuously extruded, and the continuously formed corrugated pipe has a periodically varying structure in the axial direction: from the end, in turn, the front flared section 10, the small corrugated section 11 (transition section), the normal corrugated section 12, and the rear flared section 13. The cutting equipment needs to cut off the front flared section 10 and the small corrugated section 11 of each unit of the corrugated pipe, and retain the normal corrugated section 12 and the rear flared section 13.

[0036] The front flared section 10 has a slightly larger pipe diameter, and the inner wall is relatively smooth. It is connected with the rear flared section 13 of the previous unit during extrusion production, and the first cutting position A is located between the front flared section 10 and the rear flared section 13.

[0037] The small corrugated section 11 has a smaller wave height and wave distance than the normal corrugated section 12, and is a transition area between the flared section and the normal corrugated section. The small corrugated section 11 is finally cut off and not used.

[0038] The normal corrugated section 12 has a wave height and wave distance required by the product standard, and is the main part of the pipe body. During corrugated pipe production, the length of each repeated unit of pipe material is greater than the predetermined production specification, so the front part of the normal corrugated section 12 can be cut off, and the rear part of the normal corrugated section 12 and the rear flared section 13 are retained to achieve fixed-length cutting. In the present application, the second cutting position B is located at a certain trough in the front part of the normal corrugated section 12, so as to avoid the weak part at the wave crest 121 and cut at the relatively stronger trough 122.

[0039] The rear flared section 13 has a slightly larger pipe diameter, and the inner wall is relatively smooth. It is used for the insertion of the normal corrugated section of another pipe, and relies on the internal sealing rubber ring to achieve sealing and realize the connection of the corrugated pipe.

[0040] In order to efficiently achieve the cutting purpose, the present device adopts double-knife cutting: two cutting knives (first cutting knife 301, second cutting knife 302) are fixed to the same cutting mechanism 300, and the distance D between the two cutting knives is accurately set. Through one cutting action, a section of waste containing part of the front flared section 10 and the small corrugated section 11 can be cut off between the two knives, so as to obtain a pipe material with fixed length.

[0041] Referring to Figure 2 、 5As shown, the wave tube fixed-length measuring device 200 of the embodiment includes a fixed mounting frame 2012 fixedly mounted relative to the rack 400, a floating mounting frame 201 that can float up and down, and a pair of rollers 202 rotatably mounted on the floating mounting frame 201. The rollers 202 are in rolling contact with the wave tube to be cut to support and measure the movement thereof. The floating mounting frame 201 is further provided with an inductive switch 203, a trigger 204, and a spring 206. The pair of rollers 202 are in rolling contact with the wave tube and mainly serve to support and measure the reference.

[0042] In the embodiment, the floating mounting frame 201 is kept under a certain downward pressure and can float up and down by means of a pneumatic cylinder 205. The pneumatic cylinder 205 is fixedly mounted on the fixed mounting frame 2012, and the floating mounting frame 201 is fixedly connected to a piston rod 2051 of the pneumatic cylinder 205. The pneumatic cylinder 205 continuously provides controllable downward pressure, so that the rollers and the trigger on the floating mounting frame are stably pressed against the surface of the wave tube and can adaptively float up and down with slight changes or jumps in the diameter of the tube.

[0043] In other embodiments of the present application, the floating pressing function is not limited to the structure of the pneumatic cylinder, but can also be provided by a set of compression springs arranged between the fixed mounting frame 2012 and the floating mounting frame 201 to provide constant elastic downward pressure, or by a gas bag or a gas spring to provide constant force with damping characteristics to provide constant gravitational load for the floating mounting frame.

[0044] Further, the trigger 204 is located between the pair of rollers 202 and is hingedly connected to the floating mounting frame 201 by means of a hinge shaft 207. The trigger 204 is a rod-shaped component, a first end of which constitutes a detection end 2041 capable of fitting the profile of the wave trough 122 of the wave tube, and a second end of which constitutes a shielding end 2042 with an increased surface area.

[0045] In the embodiment, the inductive switch 203 is an optical switch, and the floating mounting frame 201 is further provided with an arc-shaped groove plate 2011, in which an arc-shaped groove 2013 is formed. The inductive switch 203 is slidably mounted in the arc-shaped groove 2013, which is located at a side of the trigger 204 and opposite to the movement track of the shielding end 2042 of the trigger. The light path of the inductive switch 203 intersects with the movement track of the shielding end 2042. When the trigger continuously passes through the wave crest and trough surface, the shielding end 2042 will periodically trigger the inductive switch 203, thereby emitting a pulse signal.

[0046] In other embodiments, the inductive switch 203 can also be selected from an optical switch, a proximity switch (such as an inductive or capacitive one), or a micro switch: a signal is generated by a protrusion on the trigger or directly by the shielding end pressing a lever thereof.

[0047] The fixed-length measuring device 200 further comprises a spring 206 for providing tension to keep one end of the trigger 204 in contact with the surface of the bellows. One end of the spring 206 is connected to the trigger 204 via a first pin 208, and the other end is fixedly connected to the upper part of the floating mounting frame 201, that is, the hinge shaft 207 is located between the detection end 2041 and the first pin 208. In order to amplify the detection result, in the present application, the distance from the detection end 2041 to the hinge shaft 207 is less than the distance from the hinge shaft 207 to the first pin 208, so that the displacement of the detection end is amplified by several times on the side of the shielding end. When the bellows moves, the detection end 2041 of the trigger 204 swings around the hinge shaft 207 with the undulation of the bellows, driving the shielding end 2042 to swing up and down synchronously. The detection end 2041 of the trigger 204 can always be in contact with the outer surface of the bellows under the action of the elastic member, so as to follow the undulation of the bellows.

[0048] By adjusting the high-low position of the inductive switch 203 in the arc-shaped groove 2013, it can be set to respond only at the peak position (at this time the trigger is at the highest position) or only at the valley position (at this time the trigger is at the lowest position). Each peak or valley corresponds to generate an electric pulse. In the present application, the inductive switch 203 can be configured to send an impulse signal to the outside when the trigger 204 moves to a specific position corresponding to the peak or valley. In the present application, the inductive switch 203 is triggered when the 2042 of the trigger 204 is just located at the valley.

[0049] Referring to Figure 6 The cutting device of the present application comprises:

[0050] A rack 400;

[0051] A cutting mechanism 300 is mounted on the rack 300 and has a first clamping mechanism 403 and a second clamping mechanism 404 for clamping the bellows, and a cutting knife located between the first clamping mechanism 403 and the second clamping mechanism 404, the cutting knife comprising a first cutting knife 301 and a second cutting knife 302;

[0052] The fixed-length measuring device 200 is located upstream of the first clamping mechanism 403, the second clamping mechanism 404 and the cutting mechanism 300;

[0053] A control system is in signal connection with the first clamping mechanism 403, the second clamping mechanism 404, the inductive switch 203 and the cutting mechanism 300. The control system is configured to receive the impulse signal of the inductive switch 203, calculate the moving length of the bellows by counting the impulse signal, and control the cutting mechanism to cut when the moving length of the bellows reaches a set value.

[0054] The working process of the present application is as follows Figure 2 ,Figure 3 as shown, Figure 2 is the initial counting position of the fixed-length measuring device 200, Figure 3 is the final counting position (i.e. the cutting position):

[0055] 1. Grasping and conveying: the external feeding mechanism (such as a caterpillar feeder) grasps and continuously conveys the corrugated pipe.

[0056] 2. Measuring and counting: the corrugated pipe first passes through the fixed-length measuring device 200. When the trigger 204 continuously passes through a straight section (flared section), the control system counts a complete zero because there is no pulse signal in a period of time. When the corrugated pipe reaches the position shown, the trigger 204 detects the trough of the first small corrugated section, and the inductive switch 203 sends a pulse, and the control system starts counting. When the control system counts to the set value, the corrugated pipe moves to the position shown, and the control system can accurately measure the actual moving length of the corrugated pipe and identify the phase of the wave crest and trough. Figure 2 Figure 3

[0057] 3. Clamping and cutting: when the measured length reaches the preset value, the corrugated pipe stops moving, the first clamping mechanism 403 and the second clamping mechanism 404 clamp the corrugated pipe on both sides respectively, the cutting mechanism 300 rotates around the corrugated pipe for one revolution, and the first cutting knife 301 and the second cutting knife 302 simultaneously complete the cutting of the corrugated pipe.

[0058] 4. Reset and cycle: after cutting is completed, the clamping mechanism is loosened, and the cutting mechanism is retracted. The feeding mechanism is restarted to move the cut pipe out, and the next section of the corrugated pipe to be cut is pushed forward into the measuring position to start a new cycle.

[0059] Through the above embodiment, the present application realizes direct and high-precision measurement of the actual length of the corrugated pipe, intelligently controls the cut at the trough position with higher structural strength, and adapts to the specific processing needs of corrugated pipes with complex profiles (flared section, small corrugated section). The alternative solutions of the specific components also show that the core idea of the present application can be realized through various engineering technical means.

[0060] The basic principles, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and the scope of protection of the present application is defined by the appended claims, the specification and their equivalents.​​

Claims

1. A bellows length measuring device, characterized in that, include: The device includes a floating mounting frame that can float up and down, and at least one roller rotatably mounted on the floating mounting frame. The roller makes rolling contact with the corrugated pipe to be cut to support and measure its movement. The floating mounting frame is also equipped with an inductive switch and a trigger. The trigger is hinged to the floating mounting frame and configured such that its first end always remains in contact with the outer circumferential surface of the corrugated pipe under the action of an elastic element, so as to follow the undulating movement of the corrugated pipe's crests and troughs. The inductive switch is configured to send a pulse signal when the trigger moves to a specific position corresponding to a crest or trough.

2. The measuring device according to claim 1, characterized in that, The fixed-length measuring device also includes a fixed mounting frame and a cylinder fixedly mounted on the mounting frame, wherein the floating mounting frame is fixedly connected to the piston rod of the cylinder.

3. The measuring device according to claim 1, characterized in that, A pair of rollers are symmetrically mounted on the floating mounting frame, and the trigger is located between the pair of rollers.

4. The measuring device according to claim 1, characterized in that, The fixed-length measuring device also includes a spring that provides tension so that one end of the trigger element always remains in contact with the surface of the bellows.

5. The measuring device according to claim 4, characterized in that, The trigger is a rod-shaped component, with its first end forming a detection end that can be adapted to the contour of the corrugated pipe trough, and its second end forming a shielding end with increased surface area; the inductive switch is a photoelectric switch, and its optical path intersects with the movement trajectory of the shielding end.

6. The measuring device according to claim 5, characterized in that, The floating mounting bracket also has an arc-shaped groove plate with an arc-shaped groove. The inductive switch is slidably installed in the arc-shaped groove. The arc-shaped groove is located on the side of the trigger element, and the arc-shaped groove is opposite to the movement trajectory of the shielding end of the trigger element.

7. The measuring device according to claim 5, characterized in that, The trigger is rotatably mounted on the floating mounting frame via a hinge. The hinge is located near the lower part of the floating mounting frame. One end of the spring is connected to the trigger via a first pin, and the other end is fixedly connected to the upper part of the floating mounting frame. The hinge is located between the detection end and the first pin. The distance from the detection end to the hinge is less than the distance from the hinge to the first pin.

8. A corrugated pipe fixed-length cutting device, characterized in that, include: frame; A cutting mechanism, mounted on the frame, has a clamping mechanism for holding the corrugated pipe and a cutting blade; The fixed-length measuring device as described in any one of claims 1-7, wherein the fixed-length measuring device is located upstream of the cutting mechanism; The control system is connected to the inductive switch and the cutting mechanism. The control system is configured to receive the pulse signal, calculate the moving length of the bellows by counting the pulse signal, and control the cutting mechanism to cut when the moving length of the bellows reaches a set value.

9. The device according to claim 8, characterized in that, The control system is configured to control the cutting mechanism to perform cutting when a set value is reached based on the pulse signal count and the current pulse signal corresponds to a trough position determined by the position of the trigger element.

10. A cutting method based on the corrugated pipe fixed-length cutting device according to any one of claims 8-9, characterized in that, Includes the following steps: The first end of the trigger element is kept in floating contact with the outer circumference of the continuously conveyed bellows under the action of elasticity, and moves with the undulation of its peaks and troughs. The inductive switch detects the movement of the first end of the trigger element to a specific position of the peak or trough, and generates a periodic pulse signal accordingly. The control system receives the pulse signal and calculates the moving length of the bellows based on the counting result of the pulse signal; When the moving length reaches the set value, it is further determined whether the current pulse signal corresponds to the trough position. If so, cutting is triggered immediately; otherwise, the cutting mechanism is triggered to cut the bellows when the pulse signal corresponding to the next trough position arrives.

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