CN219512326U - Loop resistance tester - Google Patents

Abstract

The utility model relates to the field of resistance testing equipment, in particular to a loop resistance tester, which comprises a shell, wherein a tester body is arranged in the shell, a contact electrode used for being contacted with a resistance to be tested is arranged on the tester body, the contact electrode comprises an upper chuck and a lower chuck which are matched for use, an arc clamping groove is formed in the contact electrode, the arc clamping groove is respectively arranged at one side of the upper chuck and one side of the lower chuck, which are close to each other, the resistance to be tested is clamped in the arc clamping groove between the upper chuck and the lower chuck, an serration plate is slidably arranged on the inner wall of each arc clamping groove, an accommodating groove for accommodating the serration plate is formed in the inner wall of each arc clamping groove, and saw teeth of the serration plate penetrate into an oil film and an oxidation layer of the resistance to be tested. The utility model has the effect of improving the accuracy of the measured value.

Description

Loop resistance tester

Technical Field

The utility model relates to the field of resistance testing equipment, in particular to a loop resistance tester.

Background

The loop resistance tester is also called a contact resistance tester, and is a special instrument for measuring the contact resistance and the loop resistance of the switch control equipment.

The loop resistance tester comprises a shell, wherein a tester body is arranged in the shell, a testing module is arranged in the tester body and comprises an excitation generation module, a signal switching module, an input module, an ADC (analog to digital converter) module, a digital signal processing module and a display module which are electrically connected in sequence. The panel of the tester body is provided with a current input interface, a current output interface, a measurement input interface, a measurement output interface, a current display screen, a resistance display screen, a power switch, a measurement switch, a current adjusting knob, a power socket and a grounding interface. The current input interface, the current output interface, the measurement input interface and the measurement output interface are respectively and correspondingly and electrically connected with the input module. The current display screen and the resistance display screen are respectively and correspondingly electrically connected with the display module. The measuring switch and the current adjusting knob are electrically connected with the digital signal processing module.

The tester comprises a tester body, and is characterized in that a test connecting wire is arranged on the tester body and comprises at least one connecting wire, the connecting wire is electrically connected to a corresponding current input interface and a corresponding current output interface, a contact electrode which is in contact with a resistor to be tested is arranged on the connecting wire and is in contact with the resistor to be tested, the contact electrode comprises a lower chuck which is electrically connected with the connecting wire and an upper chuck which is adapted with the lower chuck, an arc clamping groove is formed in the contact electrode, the arc clamping groove is respectively formed in one side, close to the upper chuck and the lower chuck, of the upper chuck, the lower chuck is connected with the upper chuck through screw adaptation which is provided with two ends of the contact electrode, and the resistor to be tested is clamped in the arc clamping groove between the upper chuck and the lower chuck.

In view of the above related art, the inventors found that, when measuring the contact resistance of the high-voltage switch conductive circuit, an oil film and an oxide layer exist on the surface of the resistor to be measured, and direct contact is difficult to form between the contact electrode and the resistor to be measured by the oil film and the oxide layer, which reduces the accuracy of the measured value.

Disclosure of Invention

In order to improve the accuracy of measured values, the utility model provides a loop resistance tester.

The utility model provides a loop resistance tester which adopts the following technical scheme:

the utility model provides a return circuit resistance tester, includes the casing, be provided with the tester body in the casing, be provided with the contact electrode that is used for with the resistance to be tested contact on the tester body, the contact electrode is including last chuck and the lower chuck that the cooperation was used, be equipped with the arc double-layered groove on the contact electrode, the arc double-layered groove is located one side that upper chuck and lower chuck are close to each other respectively, the resistance to be tested centre gripping in the arc double-layered inslot between upper chuck and the lower chuck, every all slide on the inner wall in arc double-layered groove and be provided with the serration board, offer the holding tank that supplies the serration board to hold on the inner wall in arc double-layered groove, the sawtooth of serration board penetrates oil film and the oxide layer of the resistance to be tested.

Through adopting above-mentioned technical scheme, put into the resistance that awaits measuring along the axial of arc double-layered groove between upper chuck and the lower chuck, the sawtooth on the sawtooth board penetrates and lacerates oil film and the oxide layer of resistance that awaits measuring along the axial of arc double-layered groove, reduces the oil film and the oxide layer on resistance surface that awaits measuring and disturbs the possibility of test value, when beginning the test, slides the sawtooth board to the holding tank in, reduces the sawtooth on the sawtooth board and disturbs the possibility of test value to the accuracy of measured value has been improved.

Optionally, be provided with the slip subassembly that is used for driving the sawtooth plate to slide on the contact, a block the sawtooth plate corresponds a set of slip subassembly, slip subassembly includes first wedge pole, second wedge pole and first spring, first wedge pole and second wedge pole slip setting, one side that first wedge pole has the wedge face and two sawtooth plates one side that keep away from each other are connected, one side that the sawtooth plate was kept away from to first wedge pole and first spring coupling, the wedge face looks adaptation and the looks butt of second wedge pole of first wedge pole, the wedge face of first wedge pole and the wedge face slope setting of direction slope that keeps away from the sawtooth plate of second wedge pole, the one end that the first wedge pole was kept away from to the second wedge pole wears out the contact pole and is fixed through fixed subassembly.

By adopting the technical scheme, the second wedge rod is slid towards the direction close to the first wedge rod, so that the wedge surface of the second wedge rod is abutted with the wedge surface of the first wedge rod, the second wedge rod is continuously slid towards the direction close to the first wedge rod, the second wedge rod pushes the first wedge rod to drive the serration plate to slide towards the direction away from each other, the serration plate is slid into the accommodating groove, at the moment, the first spring is compressed, and the second wedge rod is fixed through the fixing component, so that the serration plate can be fixed in the accommodating groove;

when the sawtooth plate is required to slide out of the accommodating groove, the second wedge rod slides towards the direction far away from the first wedge rod, so that the wedge surface of the second wedge rod is separated from the wedge surface of the first wedge rod, the first wedge rod drives the sawtooth plate to reset under the action of the first spring, and the sawtooth plate can be fixed outside the accommodating groove by fixing the second wedge rod through the fixing component.

Optionally, one the second wedge corresponds a set of fixed subassembly, fixed subassembly is including sliding the dead lever that sets up on the contact pole outer wall, be equipped with first fixed orifices and second fixed orifices on the second wedge, first fixed orifices Xiang Jiao is closer to first wedge in the second fixed orifices, works as the serration board is located the holding tank outside, the dead lever passes first fixed orifices, works as the serration board is located the holding tank in, the dead lever passes the second fixed orifices.

By adopting the technical scheme, when the sawtooth plate is positioned outside the accommodating groove, the fixing rod passes through the first fixing hole, when the sawtooth plate is positioned in the accommodating groove, namely, when the second wedge rod needs to be slid, the fixing rod is slid until the second wedge rod is separated from the first fixing hole, then the second wedge rod slides in place towards the direction close to the first wedge rod, and then the fixing rod slides to pass through the second fixing hole;

when the serration plate needs to be reset, the fixing rod is slid to be separated from the second fixing hole, then the second wedge rod is slid in place towards the direction away from the first wedge rod, and the fixing rod is slid to pass through the first fixing hole, so that the second wedge rod is fixed.

Optionally, the fixed subassembly still includes the second spring, the dead lever passes through connecting plate and second spring coupling, the effort of keeping away from the connecting plate is applyed to the dead lever to the second spring, offer on the outer wall of contact pole and supply the gliding spacing groove of connecting plate, the one end and the connecting plate of second spring are connected, the other end and the inner wall connection of spacing groove of second spring.

Through adopting above-mentioned technical scheme, the effort of keeping away from the connecting plate is applyed to the dead lever to the second spring for the dead lever is difficult for breaking away from in first fixed orifices, the second fixed orifices, has improved the stability that the dead lever is arranged in first fixed orifices or second fixed orifices.

Optionally, one end of the fixing rod, which is close to the second wedge rod, is arc-shaped.

Through adopting above-mentioned technical scheme, improved the fluency that the dead lever passed second fixed orifices, improved the convenience when staff's operation dead lever.

Optionally, pulleys are arranged at the bottom of the shell, and the pulleys are positioned at four corners of the shell.

By adopting the technical scheme, the tester is convenient for the staff to stably move.

Optionally, the bottom of casing is connected with the installation piece, offer the groove of stepping down on the bottom surface of installation piece, the pulley passes through the connecting rod and the inner wall rotation in groove of stepping down is connected, the connecting rod rotates to the pulley and is located the inslot of stepping down or the pulley is located the inslot of stepping down outward, the inslot of stepping down is provided with the locating component that is used for the location to the connecting rod.

By adopting the technical scheme, when the tester needs to slide, the connecting rod is rotated, so that the pulley is positioned outside the abdication groove and the connecting rod is fixed through the positioning component; when the tester is required to be fixedly placed and tested, the connecting rod is rotated, so that the pulley is positioned in the yielding groove and the connecting rod is fixed through the positioning component, the influence of the pulley on the tester during operation is reduced, and the placement stability of the tester during operation is improved.

Optionally, the locating component includes first locating piece and second locating piece, first locating piece is located the week lateral wall of letting the groove, the second locating piece is located the diapire of letting the groove, first locating groove and second locating groove have been seted up on the connecting rod, first locating piece and first locating groove interference fit, second locating piece and second locating groove interference fit.

By adopting the technical scheme, when the pulley is positioned outside the abdication groove, the first positioning block is clamped in the first positioning groove and is in interference fit with the first positioning groove; when the pulley is located the groove of stepping down, the second locating piece card is located the second constant head tank in and with second constant head tank interference fit, first locating piece and second locating piece cooperation are used in order to realize the location to the connecting rod.

In summary, the present utility model includes at least one of the following beneficial technical effects:

1. the saw teeth on the saw tooth plate penetrate and scratch the oil film and the oxide layer of the resistor to be tested along the axial direction of the arc-shaped clamping groove, so that the possibility that the oil film and the oxide layer on the surface of the resistor to be tested interfere with the test value is reduced, and when the test is started, the saw tooth plate is slid into the accommodating groove, so that the possibility that the saw teeth on the saw tooth plate interfere with the test value is reduced, and the accuracy of the measured value is improved;

2. the second spring applies acting force to the fixing rod far away from the connecting plate, so that the fixing rod is not easy to separate from the first fixing hole and the second fixing hole, and the stability of the fixing rod in the first fixing hole or the second fixing hole is improved;

3. when the tester needs to slide, the connecting rod is rotated, so that the pulley is positioned outside the abdicating groove and the connecting rod is fixed through the positioning component; when the tester is required to be fixedly placed and tested, the connecting rod is rotated, so that the pulley is positioned in the yielding groove and the connecting rod is fixed through the positioning component, the influence of the pulley on the tester during operation is reduced, and the placement stability of the tester during operation is improved.

Drawings

FIG. 1 is a schematic diagram of an overall structure of a loop resistance tester according to an embodiment of the present utility model.

FIG. 2 is a schematic cross-sectional view showing a connection test line in an embodiment of the utility model.

Fig. 3 is a schematic cross-sectional view for showing a sliding assembly in an embodiment of the present utility model.

Fig. 4 is a schematic cross-sectional view for showing a fixing member in an embodiment of the present utility model.

Fig. 5 is an exploded view of an embodiment of the present utility model for showing a positioning assembly.

Fig. 6 is an exploded view for showing the first positioning groove and the second auxiliary groove in the embodiment of the present utility model.

Reference numerals illustrate: 1. a housing; 11. a handle; 111. a storage groove; 2. a tester body; 21. a current input interface; 22. a current output interface; 23. a measurement input interface; 24. a measurement output interface; 3. a current display screen; 31. a resistive display; 32. a power switch; 33. a measuring switch; 34. a current adjustment knob; 35. a power socket; 36. a ground interface; 4. testing the connecting wire; 41. connecting wires; 42. a contact electrode; 421. an upper chuck; 422. a lower chuck; 423. arc-shaped clamping grooves; 424. a screw; 425. a guide post; 43. a placement groove; 5. a serrated plate; 51. a receiving groove; 6. a sliding assembly; 61. a first wedge bar; 611. a first slip groove; 62. a second wedge bar; 621. a second slip groove; 622. a first fixing hole; 623. a second fixing hole; 63. a first spring; 7. a fixing assembly; 71. a fixed rod; 72. a second spring; 73. a connecting plate; 74. a limit groove; 8. a mounting block; 81. a relief groove; 82. a pulley; 83. a connecting rod; 9. a positioning assembly; 91. a first positioning block; 911. a first positioning groove; 92. a second positioning block; 921. a second positioning groove; 93. a first auxiliary block; 931. a first auxiliary groove; 94. a second auxiliary block; 941. and a second auxiliary groove.

Detailed Description

The utility model is described in further detail below with reference to fig. 1-6.

The embodiment of the utility model discloses a loop resistance tester. Referring to fig. 1 and 2, the loop resistance tester includes a housing 1, a tester body 2 is provided in the housing 1, and a current input interface 21, a current output interface 22, a measurement input interface 23, a measurement output interface 24, a current display 3, a resistance display 31, a power switch 32, a measurement switch 33, a current adjustment knob 34, a power socket 35, and a ground interface 36 are provided on a panel of the tester body 2. The tester body 2 is electrically connected with a test connecting wire 4, the test connecting wire 4 comprises a plurality of connecting wires 41, the connecting wires 41 are electrically connected to the corresponding current input interface 21 and current output interface 22, one end, away from the tester body 2, of the connecting wires 41 is connected with a contact electrode 42 used for being contacted with a resistor to be tested, and the contact electrode 42 is electrically connected with the tester body 2 through the connecting wires 41. The tester body 2 is provided with a placement groove 43 for placing the test connection wire 4.

Referring to fig. 3, the contact electrode 42 includes an upper chuck 421 and a lower chuck 422 that are cooperatively used, the contact electrode 42 is provided with an arc-shaped clamping groove 423, the arc-shaped clamping groove 423 is respectively disposed on one side of the upper chuck 421 and the lower chuck 422 that are close to each other, the resistor to be tested is clamped in the arc-shaped clamping groove 423 between the upper chuck 421 and the lower chuck 422, four screws 424 are disposed on the contact electrode 42, and the screws 424 penetrate through the upper chuck 421 and the lower chuck 422 and are in threaded connection with the upper chuck 421 and the lower chuck 422, so that the distance between the upper chuck 421 and the lower chuck 422 can be conveniently adjusted, and the resistor to be tested with different diameters can be adapted. Four guide posts 425 are oppositely arranged between the upper chuck 421 and the lower chuck 422, and the guide posts 425 are symmetrically arranged at two ends of the contact electrode 42 in the length direction. The guide posts 425 are fixedly coupled to the lower jaw 422, and the guide posts 425 pass through the upper jaw 421 and are slidably coupled to the upper jaw 421 such that the upper and lower jaws 421, 422 are maintained in alignment when the upper and lower jaws 421, 422 are moved when the distance between the upper and lower jaws 421, 422 is adjusted.

Referring to fig. 3, the inner walls of the two arc-shaped clamping grooves 423 are slidably provided with a serration plate 5, the inner walls of the arc-shaped clamping grooves 423 are provided with a containing groove 51 for containing the serration plate 5, the serration plate 5 can slide until the saw teeth of the serration plate 5 penetrate into an oil film and an oxide layer of the resistor to be measured, and the serration plate 5 can also slide until the saw teeth of the serration plate 5 are completely located in the containing groove 51. The resistor to be measured is placed between the upper chuck 421 and the lower chuck 422 along the axial direction of the arc-shaped clamping groove 423, and the saw teeth on the saw tooth plate 5 penetrate into and scratch the oil film and the oxide layer of the resistor to be measured along the axial direction of the arc-shaped clamping groove 423, so that the possibility that the oil film and the oxide layer on the surface of the resistor to be measured interfere with the test value is reduced. When the test is started, the serration plate 5 is slid into the accommodation groove 51, reducing the possibility of the serration on the serration plate 5 interfering with the test value, thereby improving the accuracy of the measured value.

Referring to fig. 3, a sliding assembly 6 for driving the serrated plate 5 to slide is disposed on the contact electrode 42, one serrated plate 5 corresponds to one group of sliding assemblies 6, the sliding assemblies 6 include a first wedge rod 61, a second wedge rod 62 and a first spring 63, the first wedge rod 61 and the second wedge rod 62 are slidably disposed and have a sliding direction perpendicular to each other, a first sliding groove 611 for sliding the first wedge rod 61 and a second sliding groove 621 for sliding the second wedge rod 62 are disposed on the contact electrode 42, an inner wall of the first sliding groove 611 is attached to a peripheral side wall of the first wedge rod 61, and an inner wall of the second sliding groove 621 is attached to a peripheral side wall of the second wedge rod 62, so that sliding stability of the first wedge rod 61 and the second wedge rod 62 is improved. One side of the first wedge rod 61 with a wedge surface is fixedly connected with one surface of the two sawtooth plates 5 far away from each other, one side of the first wedge rod 61 far away from the sawtooth plates 5 is fixedly connected with the first spring 63, and one end of the first spring 63 far away from the first wedge rod 61 is fixedly connected with the inner wall of the first sliding groove 611. The wedge surface of the first wedge rod 61 is matched with and abutted against the wedge surface of the second wedge rod 62, the wedge surface of the first wedge rod 61 and the wedge surface of the second wedge rod 62 are obliquely arranged towards the direction away from the serration plate 5, and one end of the second wedge rod 62 away from the first wedge rod 61 penetrates out of the contact electrode 42 and is fixed through the fixing assembly 7.

Referring to fig. 3 and 4, one second wedge bar 62 corresponds to one set of fixing members 7, and the fixing members 7 include fixing bars 71 and second springs 72, the fixing bars 71 being slidably disposed on the outer walls of the contact poles 42, the fixing bars 71 being fixedly connected to the second springs 72 through connection plates 73. The second wedge bar 62 is provided with a first fixing hole 622 and a second fixing hole 623, the first fixing hole 622 is closer to the first wedge bar 61 than the second fixing hole 623, the fixing bar 71 passes through the first fixing hole 622 when the serration plate 5 is located outside the receiving groove 51, and the fixing bar 71 passes through the second fixing hole 623 when the serration plate 5 is located inside the receiving groove 51. The outer wall of the contact electrode 42 is provided with a limit groove 74 for sliding the connecting plate 73, one end of the second spring 72 is fixedly connected with the connecting plate 73, and the other end of the second spring 72 is fixedly connected with the inner wall of the limit groove 74. The second spring 72 applies a force to the fixing rod 71 away from the connecting plate 73, so that the fixing rod 71 is not easy to disengage from the first fixing hole 622 and the second fixing hole 623, and the stability of the fixing rod 71 in the first fixing hole 622 or the second fixing hole 623 is improved. The end of the fixing rod 71, which is close to the second wedge rod 62, is arc-shaped, so that the fluency of the fixing rod 71 passing through the second fixing hole 623 and the second fixing hole 623 is improved, and the convenience of a worker in operating the fixing rod 71 is improved.

When the serration plate 5 is located outside the accommodation groove 51, the fixing rod 71 passes through the first fixing hole 622, when the serration plate 5 is located inside the accommodation groove 51, the fixing rod 71 is slid to be separated from the first fixing hole 622, then the second wedge rod 62 is slid toward the direction approaching to the first wedge rod 61, so that the wedge surface of the second wedge rod 62 is abutted with the wedge surface of the first wedge rod 61, the second wedge rod 62 is slid toward the direction approaching to the first wedge rod 61, so that the second wedge rod 62 pushes the first wedge rod 61 to drive the serration plate 5 to slide toward the directions away from each other, the serration plate 5 is slid into the accommodation groove 51, at this time, the first spring 63 is compressed, and then the fixing rod 71 is slid to pass through the second fixing hole 623, so that the serration plate 5 is fixed inside the accommodation groove 51. When the serration plate 5 is required to slide out of the receiving groove 51, the fixing rod 71 is slid to be separated from the second fixing hole 623, and then the second wedge rod 62 is slid toward a direction away from the first wedge rod 61, so that the wedge surface of the second wedge rod 62 is separated from the wedge surface of the first wedge rod 61, the first wedge rod 61 drives the serration plate 5 to reset under the action of the first spring 63, and at this time, the fixing rod 71 is slid to pass through the first fixing hole 622, so that the serration plate 5 is fixed out of the receiving groove 51.

Referring to fig. 2 and 5, the bottom fixed mounting of casing 1 has installation piece 8, has seted up four grooves of stepping down 81 on the bottom surface of installation piece 8, and the groove of stepping down 81 is close to the four corners setting of installation piece 8, all is provided with a pulley 82 in every groove of stepping down 81, has improved the convenience that the staff steadily moved the tester. The pulley 82 is rotatably connected with the inner wall of the abdication groove 81 through the connecting rod 83, one end of the connecting rod 83 is rotatably connected with the inner wall of the abdication groove 81, and the other end of the connecting rod 83 is rotatably connected with the pulley 82. The inner wall that the groove 81 of stepping down is located the connecting rod 83 side and the laminating of the week lateral wall of connecting rod 83, the accommodation size that the groove 81 of stepping down is located the pulley 82 side is greater than the accommodation size that the groove 81 of stepping down is located the connecting rod 83 side, and the accommodation size that the groove 81 of stepping down is located the pulley 82 side can hold the pulley 82, and the connecting rod 83 rotates to the pulley 82 and is located the groove 81 of stepping down or the pulley 82 is located the groove 81 of stepping down outward.

Referring to fig. 5 and 6, a positioning assembly 9 for positioning the connection rod 83 is provided in the relief groove 81. The positioning assembly 9 comprises a first positioning block 91 and a second positioning block 92, wherein the first positioning block 91 is fixedly connected to the peripheral side wall of the yielding groove 81, the second positioning block 92 is fixedly connected to the bottom wall of the yielding groove 81, and the peripheral side wall of the connecting rod 83 is provided with a first positioning groove 911 for clamping the first positioning block 91 and a second positioning groove 921 for clamping the second positioning block 92. The first auxiliary block 93 and the second auxiliary block 94 are arranged on the peripheral side wall of the yielding groove 81, the first auxiliary block 93 is arranged adjacent to the first positioning block 91, the second auxiliary block 94 is arranged adjacent to the second positioning block 92, the first auxiliary block 93 and the second auxiliary block 94 are arranged in a staggered mode, and the first auxiliary groove 931 for clamping the first auxiliary block 93 and the second auxiliary groove 941 for clamping the second auxiliary block 94 are formed in the peripheral side wall of the connecting rod 83. The first positioning block 91 and the first auxiliary block 93 are matched for use, two adjacent side walls of the connecting rod 83 are simultaneously positioned and fixed when the pulley 82 is positioned outside the yielding groove 81, the second positioning block 92 and the second auxiliary block 94 are matched for use, two adjacent side walls of the connecting rod 83 are simultaneously positioned and fixed when the pulley 82 is positioned in the yielding groove 81, and stability of the connecting rod 83 in two states is improved. The first positioning block 91, the second positioning block 92, the first auxiliary block 93 and the second auxiliary block 94 are umbrella-shaped, the first positioning block 91 is in interference fit with the first positioning groove 911, the second positioning block 92 is in interference fit with the second positioning groove 921, the first auxiliary block 93 is in interference fit with the first auxiliary groove 931, and the second auxiliary block 94 is in interference fit with the second auxiliary groove 941.

When the sliding tester is needed, the connecting rod 83 is rotated, so that the pulley 82 is positioned outside the yielding groove 81, the first positioning block 91 is clamped in the first positioning groove 911, and the first auxiliary block 93 is clamped in the first positioning groove 911; when the tester is required to be fixedly placed and can perform test work stably, the connecting rod 83 is rotated, the pulley 82 is positioned in the yielding groove 81, the second positioning block 92 is positioned in the second positioning groove 921, and the second auxiliary block 94 is positioned in the second auxiliary groove 941. The positioning assembly 9 automatically fixes the connecting rod 83, so that the convenience of opening and containing the pulley 82 is improved, the influence of the pulley 82 on the working of the tester is reduced by positioning of the positioning assembly 9, and the placement stability of the tester in working is improved.

Referring to fig. 1, a handle 11 is rotatably connected to an outer wall of a housing 1, so that a worker can lift the tester conveniently, and a storage groove 111 in which the handle 11 is stored is formed in the outer wall of the housing 1, so that the handle 11 can be stored in the storage groove 111 when the handle 11 is not required to be used.

The implementation principle of the loop resistance tester provided by the embodiment of the utility model is as follows: when the resistor to be measured is installed, the sawtooth plate 5 is positioned outside the accommodating groove 51, the fixing rod 71 penetrates through the first fixing hole 622, the resistor to be measured is placed between the upper chuck 421 and the lower chuck 422 along the axial direction of the arc-shaped clamping groove 423, and the sawtooth on the sawtooth plate 5 penetrates into and cuts through the oil film and the oxide layer of the resistor to be measured along the axial direction of the arc-shaped clamping groove 423. When it is necessary to start the test, the fixing rod 71 is slid to be separated from the first fixing hole 622 and the second wedge rod 62 is slid toward the direction approaching the first wedge rod 61, and after the serration plate 5 is slid into the receiving groove 51, the fixing rod 71 is slid to pass through the second fixing hole 623. When the serration plate 5 is required to be slid out of the receiving groove 51, the fixing rod 71 is slid out of the second fixing hole 623, then the second wedge rod 62 is slid in a direction away from the first wedge rod 61, and after the serration plate 5 is slid out of the receiving groove 51, the fixing rod 71 is slid through the first fixing hole 622.

When the sliding tester is needed, the connecting rod 83 is rotated, so that the pulley 82 is positioned outside the yielding groove 81, the first positioning block 91 is clamped in the first positioning groove 911, and the first auxiliary block 93 is clamped in the first positioning groove 911; when the tester is required to be fixedly placed and can perform test work stably, the connecting rod 83 is rotated, the pulley 82 is positioned in the yielding groove 81, the second positioning block 92 is positioned in the second positioning groove 921, and the second auxiliary block 94 is positioned in the second auxiliary groove 941.

The above embodiments are not intended to limit the scope of the present utility model, so: all equivalent changes in structure, shape and principle of the utility model should be covered in the scope of protection of the utility model.

Claims (8)

1. A loop resistance tester is characterized in that: including casing (1), be provided with tester body (2) in casing (1), be provided with on tester body (2) be used for with the contact pole (42) of resistance contact that awaits measuring, contact pole (42) are including last chuck (421) and lower chuck (422) that the cooperation was used, be equipped with arc clamping groove (423) on contact pole (42), one side that is close to each other is located respectively to arc clamping groove (423) upper chuck (421) and lower chuck (422), the resistance centre gripping that awaits measuring in arc clamping groove (423) between upper chuck (421) and lower chuck (422), every all slide on the inner wall of arc clamping groove (423) and be provided with sawtooth plate (5), holding tank (51) that supply sawtooth plate (5) to hold have been seted up on the inner wall of arc clamping groove (423), the sawtooth of sawtooth plate (5) penetrates oil film and the oxide layer of resistance that awaits measuring.

2. The loop resistance tester of claim 1, wherein: the contact pole (42) is provided with a sliding component (6) for driving the sawtooth plates (5) to slide, one sawtooth plate (5) corresponds to one group of sliding components (6), the sliding component (6) comprises a first wedge rod (61), a second wedge rod (62) and a first spring (63), the first wedge rod (61) and the second wedge rod (62) are arranged in a sliding way, one side of the first wedge rod (61) with a wedge surface is connected with one side of the two sawtooth plates (5) which are far away from each other, the utility model discloses a sawtooth structure, including sawtooth plate (5) and fixed subassembly (7), including first wedge pole (61), one side and first spring (63) that the sawtooth plate (5) was kept away from to first wedge pole (61), the wedge looks adaptation and the looks butt of wedge face of first wedge pole (61) and second wedge pole (62), the wedge face of first wedge pole (61) and second wedge pole (62) is towards the direction slope setting that keeps away from sawtooth plate (5), the one end that first wedge pole (61) was kept away from to second wedge pole (62) wears out contact pole (42) and is fixed through fixed subassembly (7).

3. The loop resistance tester of claim 2, wherein: one second wedge bar (62) corresponds a set of fixed subassembly (7), fixed subassembly (7) are including sliding dead lever (71) that set up on contact pole (42) outer wall, be equipped with first fixed orifices (622) and second fixed orifices (623) on second wedge bar (62), first fixed orifices (622) are closer to first wedge bar (61) than second fixed orifices (623), when serration board (5) are located holding tank (51) outward, dead lever (71) pass first fixed orifices (622), when serration board (5) are located holding tank (51) time, dead lever (71) pass second fixed orifices (623).

4. The loop resistance tester of claim 3 wherein: the fixed assembly (7) further comprises a second spring (72), the fixed rod (71) is connected with the second spring (72) through a connecting plate (73), the second spring (72) applies acting force far away from the connecting plate (73) to the fixed rod (71), a limiting groove (74) for the sliding of the connecting plate (73) is formed in the outer wall of the contact electrode (42), one end of the second spring (72) is connected with the connecting plate (73), and the other end of the second spring (72) is connected with the inner wall of the limiting groove (74).

5. The loop resistance tester of claim 3 wherein: one end of the fixed rod (71) close to the second wedge rod (62) is in an arc shape.

6. The loop resistance tester of claim 1, wherein: the bottom of the shell (1) is provided with pulleys (82), and the pulleys (82) are positioned at four corners of the shell (1).

7. The loop resistance tester of claim 6, wherein: the bottom of casing (1) is connected with installation piece (8), offer on the bottom surface of installation piece (8) groove (81) of stepping down, pulley (82) are connected through connecting rod (83) and the inner wall rotation of groove (81) of stepping down, connecting rod (83) rotate to pulley (82) be located in groove (81) of stepping down or pulley (82) are located outside groove (81) of stepping down, be provided with in groove (81) of stepping down and be used for locating component (9) to connecting rod (83) location.

8. The loop resistance tester of claim 7, wherein: the positioning assembly (9) comprises a first positioning block (91) and a second positioning block (92), the first positioning block (91) is located on the peripheral side wall of the yielding groove (81), the second positioning block (92) is located on the bottom wall of the yielding groove (81), the connecting rod (83) is provided with a first positioning groove (911) and a second positioning groove (921), the first positioning block (91) and the first positioning groove (911) are in interference fit, and the second positioning block (92) and the second positioning groove (921) are in interference fit.