Composite insulator tension test system

Abstract

The invention relates to a composite insulator tension test system, which comprises a test box, a test cavity is arranged in the test box, and an insulator assembly unit and a test unit are arranged in the test cavity; the insulator assembling unit comprises a tension trolley, a tension head, an adjusting trolley, an adjusting head and a supporting trolley. The adjusting trolley is driven by an adjusting motor to horizontally move on the guide rail, and a locking mechanism is further arranged between the adjusting trolley and the test box; a supporting rod and a bracket are installed on the supporting trolley, and the supporting trolley is driven by a supporting motor to horizontally move on the guide rail. The test unit comprises a test oil cylinder; a control unit is further arranged beside the test box and comprises a control box, a position sensor, a proximity switch and a time relay. According to the tension test system, through joint cooperation of the test box, the insulator assembling unit, the test unit and the control unit, automatic adjustment of the adjusting trolley and the supporting trolley can be achieved according to composite insulators of different lengths, manual adjustment is not needed any more, and great convenience is achieved.

Description

Technical Field

[0001] The invention relates to the field of insulator testing, and in particular to a composite insulator tension testing system. Background Art

[0002] Insulators are a special type of insulating control that can play an important role in overhead transmission lines. In the early years, insulators were mostly used on utility poles. Gradually, they were developed into high-type high-voltage power lines. Many disc-shaped insulators are hung on one end of the tower to increase the creepage distance. They are usually made of glass or ceramics and are called insulators. Insulators should not fail due to various electromechanical stresses caused by changes in environmental and electrical load conditions, otherwise the insulators will not play a significant role and will damage the use and operation life of the entire line.

[0003] In the existing production process of composite insulators, tensile tests are required for insulators, and the voltage levels of composite insulators range from AC 10kV to 1000kV and DC 500kV to 800kV. The shortest length is 310mm, and the longest can reach 11000mm. Therefore, in the existing tensile tests, horizontal tensile testing machines are mostly used to perform tensile tests on composite insulators.

[0004] For example, the horizontal tensile testing machine mentioned in patent CN203672719U belongs to the field of composite insulator tensile testing equipment. It includes two load beams horizontally arranged front and back, a left pull head and a right pull head. The left pull head is slidably fixed to the left end of the load beam and connected to the oil cylinder. The right pull head is slidably fixed to the right part of the load beam through an adjusting trolley. The side wall of the load beam is provided with a plurality of trolley positioning holes. The adjusting trolley is provided with two front and rear positioning pins. A rack is fixed at the opposite end of the two positioning pins. A gear is provided in the adjusting trolley. The two racks are meshed on both sides of the gear. The gear is connected to a rotating operating mechanism located outside the adjusting trolley through a gear shaft.

[0005] The tensile testing machine in the above patent, when conducting a tensile test on a composite insulator, realizes the assembly of the composite insulator by the cooperation of the left pull head and the right pull head. Since the specifications of the composite insulators are various, that is, the lengths of the composite insulators are inconsistent, an adjusting trolley is added to adjust the position of the right pull head so as to test composite insulators of different lengths. In the above patent, the movement of the adjusting trolley needs to be manually controlled to move the adjusting trolley to the desired position, and the trolley is fixed by manually turning the hand wheel, which is very troublesome. In addition, the composite insulator is realized by a fixed support bracket. The support of the insulator, that is, the position of the support point is fixed, and in order to meet the support of composite insulators of different lengths, it is necessary to set up multiple support brackets for support, which is very troublesome. In addition, the composite insulator is composed of a core rod, an umbrella skirt arranged on the outside of the core rod, and connecting hardware connected to both sides of the core rod. When conducting a tensile test, some composite insulators are tested with umbrella skirts, which easily leads to the use of a fixed-position support bracket to support the composite insulator. The support point is located at the umbrella skirt, which easily causes the umbrella skirt to be crushed or even broken during the tensile test, resulting in the need to clean the umbrella skirt and re-injection mold it later, which is very troublesome. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a composite insulator tension test system which can be adjusted according to the lengths of different composite insulators.

[0007] In order to solve the above technical problems, the technical solution of the present invention is: a composite insulator tension test system, the composite insulator comprises a core rod, two connection fittings connected to both sides of the core rod and a shed arranged on the outer wall of the core rod, and its innovation lies in: the tension test system comprises

[0008] A test box, which is a hollow rectangular box with an upper end open, has a test cavity in the test box, and an insulator assembly unit and a test unit are arranged in the test cavity;

[0009] The insulator assembly unit includes a tension trolley, a tension head, an adjustment trolley, an adjustment head and a support trolley. The tension trolley, the support trolley and the adjustment trolley are sequentially distributed on both sides of the test cavity and move horizontally along the test cavity. At the same time, guide rails are provided on both sides of the inner wall of the test box to provide support and movement basis for the tension trolley, the support trolley and the adjustment trolley.

[0010] The tension trolley is connected to the test unit and is pulled by the test unit to reciprocate on the guide rail. A tension head is installed on the side of the tension trolley close to the supporting trolley. A through hole is opened on the tension head for a connecting hardware to pass through up and down, so that the tension head forms a U-shaped structure. When the connecting hardware is placed in the through hole of the tension head, the relative fixation between the connecting hardware and the tension head is achieved by the first latch. A through hole is also opened on the tension head for the first latch to pass through horizontally. The first latch is driven by a first electric push rod installed on the tension head to reciprocate horizontally, so as to lock or unlock the connecting hardware.

[0011] The adjusting trolley is driven by an adjusting motor to move horizontally on the guide rail, and a locking mechanism is also provided between the adjusting trolley and the test box. An adjusting head is installed on the side of the adjusting trolley close to the supporting trolley. A through hole is provided on the adjusting head to allow another connecting hardware to pass through up and down, so that the adjusting head also forms a U-shaped structure. When the connecting hardware is placed in the through hole of the adjusting head, the second latch is used to achieve relative fixation between the connecting hardware and the adjusting head. A through hole is also provided on the adjusting head to allow the second latch to pass horizontally. The second latch is driven by a second electric push rod installed on the adjusting head to move back and forth horizontally, so as to achieve locking or unlocking of another connecting hardware.

[0012] A vertical support rod is installed on the upper end surface of the support trolley, and a bracket is installed on the top of the support rod. The upper end surface of the bracket has an arc-shaped opening for supporting the core rod. The support trolley is driven by a support motor to move horizontally on the guide rail;

[0013] The test unit includes a test oil cylinder installed in the test box, the piston rod of the test oil cylinder is connected to the side of the pulling trolley away from the adjusting trolley, and pulls the pulling trolley to move horizontally in the test cavity;

[0014] A control unit is also provided on the side of the test box, and the control unit includes a control box, a position sensor, a proximity switch and a time relay. The control box is installed on the side of the test box, and the control box is equipped with at least one controller and a display screen for personnel operation. There are two position sensors, namely a first position sensor installed on the adjusting trolley and a second position sensor installed on the supporting trolley. At the same time, several calibration rods for cooperating with the first position sensor and the second position sensor are also provided on the inner wall of the test box. There are two proximity switches, namely a first proximity switch installed on the tension head and a second proximity switch installed on the adjusting head. The position sensor, the proximity switch and the time relay are all connected to the input end of the controller, and the output end of the controller is connected to the first electric push rod, the second electric push rod, the adjusting motor, the locking mechanism, the supporting motor and the test cylinder.

[0015] Furthermore, the test method of the tensile test system comprises the following steps:

[0016] S1: First, number each calibration rod respectively, and input the numbers of the calibration rods where the adjustment trolleys and support trolleys corresponding to various composite insulators are located when conducting tension tests on composite insulators of different specifications in the controller, as well as the different tension requirements of the test cylinder when conducting tension tests on composite insulators of different specifications, to form a test database;

[0017] S2: Secondly, the specifications of the composite insulators to be subjected to the tensile test are manually input on the display screen of the control box, so that the corresponding data can be retrieved from the test database;

[0018] S3: Then, the regulating motor drives the regulating trolley to move horizontally in a random direction on the guide rail, and the first position sensor detects the number of the first calibration rod that passes through, and transmits the detection data to the controller, and the controller makes a judgment based on the number of the calibration rod and the number information of the calibration rod required for the test, and controls the regulating motor to drive the regulating trolley to move horizontally in a specified direction on the guide rail, and the first position sensor continues to detect the calibration rod that passes through, and transmits the detection result to the controller;

[0019] S4: The controller compares the number information of the calibration rod transmitted by the first position sensor with the number in the test database. If the number information of the calibration rod is the required number, the process proceeds to step S5. If the number information of the calibration rod is not the required number, the process proceeds to step S6.

[0020] S5: The adjusting motor drives the adjusting trolley to stop moving, and the controller drives the locking mechanism to lock the adjusting trolley with the test chamber, thus completing the position adjustment of the adjusting trolley.

[0021] S6: the adjusting motor drives the adjusting trolley to continue to move horizontally in the specified direction, and repeats step S4;

[0022] S7: the support motor drives the support trolley to move, and the position of the support trolley is adjusted by referring to steps S3-S6. The difference is that after the support trolley stops moving, the locking mechanism is not required to lock the position;

[0023] S8: After the adjustment trolley and the support trolley are adjusted into place, the composite insulator that needs to be subjected to the tensile test is manually hoisted into the test box by means of a crane, and the composite insulator is lowered, and the positions of the two connection fittings on both sides of the composite insulator are detected by the first proximity switch and the second proximity switch respectively;

[0024] S9: When the first proximity switch detects a proximity signal, it means that the connection fittings have reached the specified position of the tension head, and the traveling crane is controlled to stop the lowering of the composite insulator. At the same time, the time relay performs timing, and the first proximity switch keeps detecting. After the set time is reached, if the first proximity switch continues to detect the proximity signal, the controller controls the first electric push rod to drive the first pin to perform horizontal movement to achieve the fixation between the connection fittings and the tension head. If the proximity signal of the first proximity switch is interrupted before the set time is reached, the traveling crane is used to control the composite insulator to move until the first proximity switch detects the proximity signal again, and the time relay restarts the timing;

[0025] S10: When the second proximity switch detects a proximity signal, it indicates that the connecting fitting has reached the designated position of the adjusting head, and referring to step S9, the fixation between another connecting fitting and the adjusting head is completed;

[0026] S11: After the two connection fittings are fixed, the overhead crane releases the composite insulator, and then the controller controls the test cylinder to move and start the tensile test. After the test, the test results are transmitted to the controller for storage.

[0027] Furthermore, the locking mechanism is as follows: a pair of locking shafts are arranged in the adjusting trolley, and the two locking shafts are driven by a driving assembly to extend out of the adjusting trolley from both sides thereof respectively, and an array of locking hole groups corresponding to each calibration rod is opened on the inner wall of the test box, and each group of locking hole groups is composed of two locking holes distributed on both sides of the inner wall of the test box, and the locking between the adjusting trolley and the test box is achieved by inserting the locking shaft into the locking hole.

[0028] Furthermore, the driving assembly is as follows: a pair of mutually meshing driving gears are installed in the adjusting trolley, and racks that mesh with the two driving gears one by one are arranged on the sides of the two locking shafts. Any one of the driving gears is driven to rotate by a locking motor installed on the adjusting trolley, and the synchronous reverse movement of the two locking shafts is realized. The locking motor is connected to the output end of the controller.

[0029] Furthermore, a chamfer is provided on one end of the locking shaft inserted into the locking hole.

[0030] Furthermore, the guide rail has a first plane located in the horizontal direction and a second plane located in the vertical direction, and the first plane and the second plane are distributed in an inverted L shape. The two guide rails in the test box are symmetrically distributed, and the tension trolley, the adjustment trolley and the support trolley are all equipped with movable rollers that roll back and forth on the guide rails. The movable rollers include a main roller that rolls on the first plane and a limit plate connected to the main roller and located beside the second plane.

[0031] Furthermore, a cover plate covering the test cavity is connected to the upper end of the test box, and the cover plate is composed of a plurality of plate bodies distributed in parallel, and one side of each plate body is hinged to the test box, and is driven to swing by an independent swing cylinder to achieve the sealing and opening of the test cavity.

[0032] Furthermore, the plate body is provided with a plurality of hollow holes arranged in a rectangular array.

[0033] The advantages of the present invention are as follows: the tension test system of the present invention, through the cooperation of the test box, the insulator assembly unit, the test unit and the control unit, can realize automatic adjustment of the adjustment trolley and the support trolley according to the composite insulators of different lengths, without the need for manual adjustment, which is very convenient; and the support trolley is designed to be mobile, so only two or even one trolley are needed to support the composite insulators, which greatly reduces the number of supports required.

[0034] The test method of the present invention is based on a special tension test system. First, the positions of the adjustment trolley and the support trolley are adjusted according to the length of the composite insulator to be tested to complete the preparation work, and then the composite insulator is suspended and fixed by a crane. Finally, the test is carried out. The entire test process requires very little manual labor, which greatly reduces manual operation, and also reduces the occurrence of mistakes, repeated adjustments, deviations and other problems caused by manual operation, thereby improving the test efficiency and accuracy.

[0035] The design of the locking mechanism adopts a method of inserting the locking shaft into the locking hole to achieve locking and unlocking between the adjusting trolley and the test box. The action process is simple and can achieve stable locking between the adjusting trolley and the test box. The design of the driving component adopts a pair of mutually meshing driving gears and the rack on the locking shaft. Only one motor is needed to achieve the synchronous reverse movement of the two locking shafts, which reduces the driving components and makes the structure simpler.

[0036] As for the coordination between the guide rail and the movable roller, two planes of the guide rail in the horizontal direction and the vertical direction are used to coordinate with the main roller and the limit plate of the movable roller. The rolling of the main roller on the first plane ensures the smooth translation of the trolley, and the coordination between the limit plate and the second plane is used to achieve a limit on the position of the trolley to prevent the trolley from running off the track during movement.

[0037] The hinged cover on the test box is designed to provide protection to prevent the composite insulator from being ejected from the test box due to the connection fittings and core rods on both sides of the composite insulator being detached during the test, thereby avoiding safety accidents. The hollow holes designed on the plate body can reduce the weight of the entire plate body while ensuring the structural strength of the plate body, and on the other hand, it is convenient for personnel to observe the test process from the hollow holes. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the composite insulator tension test system of the present invention.

[0039] Figure 2 It is a top view of the tension head in the present invention.

[0040] Figure 3 It is a top view of the adjusting head in the present invention.

[0041] Figure 4 It is a schematic diagram of the locking mechanism in the present invention.

[0042] Figure 5 It is a schematic diagram of the cooperation between the moving roller and the guide rail in the present invention. DETAILED DESCRIPTION

[0043] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0044] like Figure 1-Figure 5 A composite insulator tension test system is shown, the composite insulator comprises a core rod, two connection fittings connected to both sides of the core rod, and a shed arranged on the outer wall of the core rod. The tension test system comprises

[0045] A test box 1 is a hollow rectangular box with an upper end open. A test cavity is provided in the test box 1. An insulator assembly unit and a test unit are arranged in the test cavity.

[0046] A cover plate covering the test cavity is also connected to the upper end of the test box 1. The cover plate is composed of several parallel plate bodies 8, and one side of each plate body 8 is hinged to the test box 1, and each plate body 8 is driven by an independent swing cylinder installed on the side wall of the test box 1 to swing, so as to cover and open the test cavity. The design of the hinged cover plate on the test box 1 is used to play a protective role, to avoid the composite insulator popping out of the test box 1 due to the separation between the connection fittings and the core rod on both sides of the composite insulator during the test, and to avoid safety accidents; and the entire cover plate is designed as a split structure composed of multiple plate bodies 8. On the one hand, different plate bodies 8 are driven by different swing cylinders to swing, which reduces the power required by a single swing cylinder. On the other hand, the number of plate bodies 8 to be moved can be selected according to the length of the composite insulator, without the need to seal the entire cover plate every time.

[0047] The plate body 8 is also provided with a plurality of hollow holes 81 arranged in a rectangular array. The hollow holes 81 designed on the plate body 8 can reduce the weight of the entire plate body 8 on the basis of ensuring the structural strength of the plate body 8, and can also facilitate personnel to observe the test process from the hollow holes 81.

[0048] The insulator assembly unit includes a tension trolley 2, a tension head 21, an adjustment trolley 3, an adjustment head 31 and a support trolley 4. The tension trolley 2, the support trolley 4 and the adjustment trolley 3 are sequentially distributed on both sides of the test cavity and move horizontally along the test cavity. At the same time, guide rails 5 are provided on both sides of the inner wall of the test box 1 to provide support and a moving basis for the tension trolley 2, the support trolley 4 and the adjustment trolley 3.

[0049] The tension trolley 2 is connected to the test unit and is pulled by the test unit to reciprocate on the guide rail 5. A tension head 21 is installed on the side of the tension trolley 2 close to the support trolley 4. Figure 2 As can be seen from the schematic diagram shown, a through hole 211 is provided on the tension head 21 for accommodating a connecting hardware to pass through up and down, so that the tension head 21 forms a U-shaped structure, and when the connecting hardware is placed in the through hole of the tension head 21, the relative fixation between the connecting hardware and the tension head 21 is achieved by the first pin 22, and a through hole 212 is also provided on the tension head 21 for accommodating the first pin 22 to pass horizontally, and the first pin 22 is driven by a first electric push rod 24 installed on the tension head 21 to perform horizontal reciprocating movement, thereby locking or unlocking the connecting hardware.

[0050] The first electric push rod 24 is installed on the side of the pulling head 21 through a first bracket 23. The first bracket 23 is an L-shaped bracket. One side of the first bracket 23 is directly fixed on the pulling head 21. The first electric push rod 24 is fixed on the first bracket 23. The push rod of the first electric push rod 24 is connected to the first pin 22 and drives the first pin 22 to move horizontally in the through hole 212.

[0051] The adjusting trolley 3 is driven by an adjusting motor to move horizontally on the guide rail 5, and a locking mechanism is also provided between the adjusting trolley and the test box 1. Figure 4 As can be seen from the schematic diagram shown, the locking mechanism is as follows: a pair of locking shafts 32 are arranged in the adjusting trolley 3, the locking shafts 32 are cylindrical shafts, and the two locking shafts 32 are driven by a driving assembly to extend out of the adjusting trolley 3 from both sides of the adjusting trolley 3, and an extension hole for accommodating the extension of the locking shaft 32 is opened on the adjusting trolley 3. At the same time, a mounting sleeve 34 for supporting and guiding the locking shaft 32 is also arranged on the inner wall of the adjusting trolley 3 at the extension hole, and the outer wall of the locking shaft 32 is in contact with the inner wall of the mounting sleeve 34.

[0052] The driving assembly is as follows: a pair of mutually meshing driving gears 33 are installed in the adjusting trolley 3, and racks 35 meshing with the two driving gears 33 are arranged on the sides of the two locking shafts 32, wherein any one of the driving gears 33 is driven to rotate by the locking motor installed on the adjusting trolley 3, and the synchronous reverse movement of the two locking shafts 32 is realized. The design of the driving assembly adopts the cooperation of a pair of mutually meshing driving gears 33 and the racks 35 on the locking shafts 32, and only one motor is needed to realize the synchronous reverse movement of the two locking shafts 32, which reduces the number of driving assemblies, makes the structure simpler, and the corresponding action is also simpler.

[0053] There are also several locking hole groups on the inner wall of the test box 1, each of which is composed of two locking holes 11 distributed on both sides of the inner wall of the test box 1. The locking holes 11 are circular holes, and the locking shaft 32 is inserted into the locking hole 11 to achieve the locking between the adjustment trolley 3 and the test box 1. The design of the locking mechanism adopts the method of inserting the locking shaft 32 into the locking hole 11 to achieve the locking between the adjustment trolley 3 and the test box 1 or pulling the locking shaft 32 out of the locking hole 11 to achieve unlocking. The action process is simple and can achieve stable locking between the adjustment trolley 3 and the test box 1.

[0054] A chamfer is also provided at one end of the locking shaft 32 inserted into the locking hole 11. The chamfer at the end of the locking shaft 32 is designed to facilitate the locking shaft 32 to be smoothly inserted into the locking hole 11, and to guide the locking shaft 32 to a certain extent.

[0055] An adjusting head 31 is installed on one side of the adjusting trolley 3 close to the supporting trolley 4. Figure 3 As can be seen from the schematic diagram shown, the adjusting head 31 is provided with a through hole 311 for another connecting hardware to pass through up and down, so that the adjusting head 31 also forms a U-shaped structure, and when the connecting hardware is placed in the through hole 311 of the adjusting head 31, the relative fixation between the connecting hardware and the adjusting head 31 is achieved by the second pin 36, and the adjusting head 31 is also provided with a through hole 312 for the second pin 36 to pass horizontally. The second pin 36 is driven by a second electric push rod 37 installed on the adjusting head 31 to perform horizontal reciprocating movement, thereby locking or unlocking another connecting hardware.

[0056] The second electric push rod 37 is installed on the side of the adjusting head 31 through the cooperation of a second bracket 38. The second bracket 38 is an L-shaped bracket. One side of the second bracket 38 is directly fixed on the adjusting head 31. The second electric push rod 37 is fixed on the second bracket 38. The push rod of the second electric push rod 37 is connected to the second pin 36 and drives the second pin 36 to move horizontally in the through hole 312, thereby locking or unlocking the connecting hardware.

[0057] A vertically arranged support rod 41 is installed on the upper end surface of the support trolley 4, and a bracket 42 is installed on the top end of the support rod 41. The upper end surface of the bracket 42 has an arc-shaped opening for supporting the core rod of the composite insulator. The support trolley 4 is driven by a support motor to move horizontally on the guide rail 5.

[0058] like Figure 5 As can be seen from the schematic diagram shown, the guide rail 5 is a square tube structure extending along the long axis direction of the test box 1, and one side of the guide rail 5 is welded and fixed to the inner wall of the test box 1. The guide rail 5 has a first plane 51 located in the horizontal direction and a second plane 52 located in the vertical direction, and the first plane 51 and the second plane 52 are distributed in an inverted L shape, and the two guide rails 5 in the test box 1 are symmetrically distributed, and movable rollers rolling back and forth on the guide rail 5 are installed on the tension trolley 2, the adjustment trolley 3 and the support trolley 4. The movable rollers include a main roller 6 rolling on the first plane 51 and a limit plate 61 connected to the main roller 6 and located beside the second plane 52, and the size of the limit plate 61 is larger than that of the main roller 6. As for the coordination between the guide rail 5 and the movable roller, two planes of the guide rail 5 in the horizontal direction and the vertical direction are used to coordinate with the main roller 6 and the limit plate 61 of the movable roller. The rolling of the main roller 6 on the first plane 51 ensures the smooth translation of the trolley, and the coordination between the limit plate 61 and the second plane 52 is used to achieve a limit on the position of the trolley to prevent the trolley from running off the track during movement.

[0059] The test unit includes a test cylinder 7 installed in the test box 1. The piston rod of the test cylinder 7 is connected to the side of the tension trolley 2 away from the adjusting trolley 3, and pulls the tension trolley 2 to move horizontally in the test cavity. Different tensions are applied to the tension trolley 2 through the test cylinder 7, thereby performing a tension test.

[0060] A control unit is also provided on the side of the test box 1. The control unit includes a control box, a position sensor, a proximity switch and a time relay. The control box is installed on the side of the test box 1. The control box is equipped with a controller and a display screen for personnel to operate. A central processing unit is provided in the controller. There are two position sensors, namely a first position sensor 39 installed on the adjustment trolley 3 and a second position sensor 43 installed on the support trolley 4. At the same time, several calibration rods for position calibration in coordination with the first position sensor 39 and the second position sensor 43 are also provided on the inner wall of the test box 1. The calibration rod 39 is the first calibration rod, and each first calibration rod corresponds to each group of locking hole groups one by one. The calibration rod matched with the second position sensor 43 is the second calibration rod. There are two proximity switches, namely the first proximity switch installed on the tension head 21 and the second proximity switch installed on the adjustment head 31. The first proximity switch is located at the through hole 211, and the second proximity switch is located at the through hole 311. Each position sensor, proximity switch and time relay is connected to the input end of the controller, and the output end of the controller is connected to the first electric push rod 24, the second electric push rod 37, the adjustment motor, the locking motor, the support motor and the test cylinder 7.

[0061] When the above-mentioned tensile test system is used to perform a tensile test on a composite insulator, the tensile test method includes the following steps:

[0062] S1: First, number each first calibration rod and second calibration rod respectively, and input the numbers of the calibration rods where the adjustment trolley 3 and the support trolley 4 corresponding to various composite insulators are located when conducting tension tests on composite insulators of different specifications in the controller, as well as the different tension requirements of the test cylinder 7 when conducting tension tests on composite insulators of different specifications, to form a test database.

[0063] S2: Secondly, the specifications of the composite insulators that need to be subjected to the tensile test are manually input on the display screen of the control box, so that the corresponding data can be retrieved from the test database.

[0064] S3: Then, the adjusting motor drives the adjusting trolley 3 to move horizontally in a random direction on the guide rail 5. At the same time, the first position sensor 39 detects the number of the first first calibration rod passed through, and transmits the detection data to the controller. The controller makes a judgment based on the number of the first calibration rod and the number information of the first calibration rod required for the test to control the adjusting motor to drive the adjusting trolley 3 to move horizontally in a specified direction on the guide rail so that the adjusting trolley 3 can move to the required position. When the adjusting trolley 3 just starts to move, the actual position of the adjusting trolley 3 is not determined. Therefore, the position of the adjusting trolley 3 is first judged by arbitrarily moving the adjusting trolley 3 to a first calibration rod, and then the number of the first calibration rod is compared with the number of the first calibration rod actually required to be moved to determine whether the adjusting trolley 3 continues to move in the original direction or moves in the opposite direction.

[0065] At the same time, the first position sensor 39 continues to detect the first calibration rod passing through, and transmits the detection result to the controller.

[0066] S4: The controller compares the numbering information of the first calibration rod transmitted by the first position sensor 39 with the numbering information of the required first calibration rod in the test database. If the numbering information of the first calibration rod is the number of the required first calibration rod, the process proceeds to step S5; if the numbering information of the first calibration rod is not the number of the required first calibration rod, the process proceeds to step S6.

[0067] S5: The adjusting motor drives the adjusting trolley 3 to stop moving, and the controller drives the locking motor to operate. The locking motor drives the two locking shafts 32 to extend out of the adjusting trolley 3, and respectively insert them into the two locking holes 11 at the corresponding positions of the test box 1, so as to realize the locking between the adjusting trolley 3 and the test box 1, and complete the adjustment of the position of the adjusting trolley 3. Since the end of the adjusting trolley 3 needs to be used as a fixed end during the test, a locking mechanism must be used to lock the position of the adjusting trolley 3.

[0068] S6: The adjusting motor drives the adjusting trolley 3 to continue to move horizontally in the specified direction, and repeats step S4.

[0069] S7: The support motor drives the support trolley 4 to move, and the position of the support trolley is adjusted by referring to steps S3-S6. The difference is that since the support trolley 4 is only used to support the composite insulator, the position of the support trolley 4 does not need to be fixed. After the support trolley 4 stops moving, the locking mechanism is not required to lock the position.

[0070] S8: After the adjustment trolley 3 and the support trolley 4 are adjusted into place, the composite insulator that needs to be subjected to the tension test is manually hoisted into the test box 1 by means of a crane, and the composite insulator is lowered. The positions of the two connecting fittings on both sides of the composite insulator are detected by the first proximity switch and the second proximity switch respectively.

[0071] S9: When the first proximity switch detects the proximity signal, it means that the connection fitting has reached the specified position of the tension head 21, and the crane is controlled to stop the lowering of the composite insulator. At the same time, the time relay is timing, and the first proximity switch keeps detecting. After the set time is reached, if the first proximity switch continues to detect the proximity signal, the controller controls the first electric push rod 24 to move, and drives the first pin 22 to move horizontally to achieve the fixation between the connection fitting and the tension head 21. If the proximity signal of the first proximity switch is interrupted before the set time is reached, the composite insulator is controlled by the crane to move until the first proximity switch detects the proximity signal again, and the time relay restarts the timing. The time relay is used to control the position between the connection fitting and the tension head 21 in time, so as to ensure that the connection fitting stays at the tension head 2 for a long time and stably, and to avoid the connection fitting staying at the tension head 2 for only a short time, which causes the subsequent first pin 22 to fail to smoothly fix the connection fitting and the tension head 21.

[0072] S10: When the second proximity switch detects a proximity signal, it indicates that the connecting fitting has reached the designated position of the adjusting head 31 , and referring to step S9 , the fixation between another connecting fitting and the adjusting head 31 is completed.

[0073] S11: After the two connection fittings are fixed, the overhead crane releases the composite insulator, and then the controller controls the test cylinder 7 to move and start the tensile test. After the test is completed, the test result is transmitted to the controller for storage.

[0074] The test method of the present invention is based on a dedicated tension test system. First, the positions of the adjustment trolley 3 and the support trolley 4 are adjusted according to the length of the composite insulator to be tested to complete the preparation work, and then the composite insulator is suspended and fixed by a crane. Finally, the test is carried out. The entire test process requires very little manual labor, which greatly reduces manual operation, and also reduces the occurrence of errors, repeated adjustments, deviations and other problems caused by manual operation, thereby improving the test efficiency and accuracy.

[0075] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A composite insulator tension test system, the composite insulator comprises a core rod, two connection fittings connected to both sides of the core rod, and a shed arranged on the outer wall of the core rod, characterized in that: Tensile test system includes A test box, which is a hollow rectangular box with an upper end open, has a test cavity in the test box, and an insulator assembly unit and a test unit are arranged in the test cavity; The insulator assembly unit includes a tension trolley, a tension head, an adjustment trolley, an adjustment head and a support trolley. The tension trolley, the support trolley and the adjustment trolley are sequentially distributed on both sides of the test cavity and move horizontally along the test cavity. At the same time, guide rails are provided on both sides of the inner wall of the test box to provide support and movement basis for the tension trolley, the support trolley and the adjustment trolley. The tension trolley is connected to the test unit and is pulled by the test unit to reciprocate on the guide rail. A tension head is installed on the side of the tension trolley close to the supporting trolley. A through hole is opened on the tension head for a connecting hardware to pass through up and down, so that the tension head forms a U-shaped structure. When the connecting hardware is placed in the through hole of the tension head, the relative fixation between the connecting hardware and the tension head is achieved by the first latch. A through hole is also opened on the tension head for the first latch to pass through horizontally. The first latch is driven by a first electric push rod installed on the tension head to reciprocate horizontally, so as to lock or unlock the connecting hardware. The adjusting trolley is driven by an adjusting motor to move horizontally on the guide rail, and a locking mechanism is also provided between the adjusting trolley and the test box. An adjusting head is installed on the side of the adjusting trolley close to the supporting trolley. A through hole is provided on the adjusting head to allow another connecting hardware to pass through up and down, so that the adjusting head also forms a U-shaped structure. When the connecting hardware is placed in the through hole of the adjusting head, the second latch is used to achieve relative fixation between the connecting hardware and the adjusting head. A through hole is also provided on the adjusting head to allow the second latch to pass horizontally. The second latch is driven by a second electric push rod installed on the adjusting head to move back and forth horizontally, so as to achieve locking or unlocking of another connecting hardware. A vertical support rod is installed on the upper end surface of the support trolley, and a bracket is installed on the top of the support rod. The upper end surface of the bracket has an arc-shaped opening for supporting the core rod. The support trolley is driven by a support motor to move horizontally on the guide rail; The test unit includes a test oil cylinder installed in the test box, the piston rod of the test oil cylinder is connected to the side of the pulling trolley away from the adjusting trolley, and pulls the pulling trolley to move horizontally in the test cavity; A control unit is also provided on the side of the test box, and the control unit includes a control box, a position sensor, a proximity switch and a time relay. The control box is installed on the side of the test box, and the control box is equipped with at least one controller and a display screen for personnel operation. There are two position sensors, namely a first position sensor installed on the adjusting trolley and a second position sensor installed on the supporting trolley. At the same time, several calibration rods for cooperating with the first position sensor and the second position sensor are also provided on the inner wall of the test box. There are two proximity switches, namely a first proximity switch installed on the tension head and a second proximity switch installed on the adjusting head. The position sensor, the proximity switch and the time relay are all connected to the input end of the controller, and the output end of the controller is connected to the first electric push rod, the second electric push rod, the adjusting motor, the locking mechanism, the supporting motor and the test cylinder.

2. The composite insulator tension test system according to claim 1, characterized in that: The test method of the tensile test system comprises the following steps: S1: First, number each calibration rod respectively, and input the numbers of the calibration rods where the adjustment trolleys and support trolleys corresponding to various composite insulators are located when conducting tension tests on composite insulators of different specifications in the controller, as well as the different tension requirements of the test cylinder when conducting tension tests on composite insulators of different specifications, to form a test database; S2: Secondly, the specifications of the composite insulators to be subjected to the tensile test are manually input on the display screen of the control box, so that the corresponding data can be retrieved from the test database; S3: Then, the regulating motor drives the regulating trolley to move horizontally in a random direction on the guide rail, and the first position sensor detects the number of the first calibration rod that passes through, and transmits the detection data to the controller, and the controller makes a judgment based on the number of the calibration rod and the number information of the calibration rod required for the test, and controls the regulating motor to drive the regulating trolley to move horizontally in a specified direction on the guide rail, and the first position sensor continues to detect the calibration rod that passes through, and transmits the detection result to the controller; S4: The controller compares the number information of the calibration rod transmitted by the first position sensor with the number in the test database. If the number information of the calibration rod is the required number, the process proceeds to step S5. If the number information of the calibration rod is not the required number, the process proceeds to step S6. S5: The adjusting motor drives the adjusting trolley to stop moving, and the controller drives the locking mechanism to lock the adjusting trolley with the test chamber, thus completing the position adjustment of the adjusting trolley. S6: the adjusting motor drives the adjusting trolley to continue to move horizontally in the specified direction, and repeats step S4; S7: the support motor drives the support trolley to move, and the position of the support trolley is adjusted by referring to steps S3-S6. The difference is that after the support trolley stops moving, the locking mechanism is not required to lock the position; S8: After the adjustment trolley and the support trolley are adjusted into place, the composite insulator that needs to be subjected to the tensile test is manually hoisted into the test box by means of a crane, and the composite insulator is lowered, and the positions of the two connection fittings on both sides of the composite insulator are detected by the first proximity switch and the second proximity switch respectively; S9: When the first proximity switch detects a proximity signal, it means that the connection fittings have reached the specified position of the tension head, and the traveling crane is controlled to stop the lowering of the composite insulator. At the same time, the time relay performs timing, and the first proximity switch keeps detecting. After the set time is reached, if the first proximity switch continues to detect the proximity signal, the controller controls the first electric push rod to drive the first pin to perform horizontal movement to achieve the fixation between the connection fittings and the tension head. If the proximity signal of the first proximity switch is interrupted before the set time is reached, the traveling crane is used to control the composite insulator to move until the first proximity switch detects the proximity signal again, and the time relay restarts the timing; S10: When the second proximity switch detects a proximity signal, it indicates that the connection fitting has reached the designated position of the adjustment head, and referring to step S9, the fixation between another connection fitting and the adjustment head is completed; S11: After the two connection fittings are fixed, the overhead crane releases the composite insulator, and then the controller controls the test cylinder to move and start the tensile test. After the test, the test results are transmitted to the controller for storage.

3. The composite insulator tension test system according to claim 1, characterized in that: The locking mechanism is as follows: a pair of locking shafts are arranged in the adjusting trolley, and the two locking shafts are driven by a driving assembly to extend out of the adjusting trolley from both sides thereof respectively. An array of locking hole groups corresponding to each calibration rod is also opened on the inner wall of the test box. Each group of locking hole groups is composed of two locking holes distributed on both sides of the inner wall of the test box. The locking between the adjusting trolley and the test box is achieved by inserting the locking shaft into the locking hole.

4. The composite insulator tension test system according to claim 3, characterized in that: The driving assembly is as follows: a pair of mutually meshing driving gears are installed in the adjusting trolley, and racks that mesh with the two driving gears one by one are arranged on the sides of the two locking shafts. Any one of the driving gears is driven to rotate by a locking motor installed on the adjusting trolley, and the synchronous reverse movement of the two locking shafts is realized. The locking motor is connected to the output end of the controller.

5. The composite insulator tension test system according to claim 3, characterized in that: The end portion of one side of the locking shaft inserted into the locking hole is also provided with a chamfer.

6. The composite insulator tension test system according to claim 1, characterized in that: The guide rail has a first plane located in the horizontal direction and a second plane located in the vertical direction, and the first plane and the second plane are distributed in an inverted L shape. The two guide rails in the test box are symmetrically distributed. The tension trolley, the adjustment trolley and the support trolley are all equipped with movable rollers that roll back and forth on the guide rails. The movable rollers include a main roller that rolls on the first plane and a limit plate connected to the main roller and located beside the second plane.

7. The composite insulator tension test system according to claim 1, characterized in that: The upper end of the test box is also connected to a cover plate covering the test cavity. The cover plate is composed of several parallel plate bodies, and one side of each plate body is hinged to the test box and driven by an independent swing cylinder to swing, thereby achieving the sealing and opening of the test cavity.

8. The composite insulator tension test system according to claim 7, characterized in that: The plate body is also provided with a plurality of hollow holes arranged in a rectangular array.

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