Circuit breaker pull rod adjusting device

Abstract

The invention discloses a circuit breaker pull rod adjusting device, and relates to the technical field of circuit breaker accessories, the circuit breaker pull rod adjusting device comprises a base, a fixed end positioning part and a fixed end screw positioning block, and the fixed end screw positioning block is used for positioning first adjusting screws of a new pull rod and an old pull rod; the adjusting end positioning part comprises a first supporting block and a second supporting block; the first supporting block is used for supporting a second adjusting screw rod of the old pull rod, the second adjusting screw rod on the old pull rod is fixed to the base through a first fixing pin, a second fixing pin is arranged on the second adjusting screw rod on the new pull rod in a penetrating mode, and the second fixing pin is slidably adjusted to the base; the vernier caliper comprises a caliper body and a measuring head, the caliper body is arranged between the two first supporting blocks and the two second supporting blocks in the extension direction of the pull rod, the measuring head is connected to the caliper body in a sliding mode, and a movable limiting plug pin is arranged on one side of the measuring head; a fixing plate is arranged away from the vernier caliper, an elastic piece is fixedly connected between the fixing plate and the measuring head, and the elastic piece pulls the measuring head to slide. The length of new and old pull rods can be accurately positioned, the length of the new pull rod is adjusted to be consistent with that of the old pull rod, and the pull rod adjusting efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of circuit breaker accessories, and in particular to a circuit breaker pull rod adjusting device. Background Art

[0002] The circuit breaker rod, also known as the insulating rod, is an important part of the circuit breaker. It is mainly used to connect with the moving contact of the vacuum interrupter to transmit power. The insulating rod is usually made of new insulating materials and has the characteristics of good sealing, anti-aging, high voltage resistance, and non-combustion. It is widely used in the control and protection of various power equipment and power lines.

[0003] At present, due to existing circuit breaker design defects or after the circuit breaker pull rod has been used for a period of time, the circuit breaker pull rod needs to be replaced. When replacing the circuit breaker pull rod, the center distance of the circular holes at both ends of the new pull rod needs to be adjusted to be consistent with the old pull rod to ensure the normal use of the pull rod. In the absence of fixation, even if the center distance of the circular holes of the adjusting screws at both ends of the new and old pull rods is adjusted to be consistent, when the nuts are tightened, the adjusting screws at both ends will be driven to rotate together, causing the length to change. Therefore, repeated comparisons are required during the installation process, which is time-consuming and laborious. Summary of the invention

[0004] In view of the above shortcomings, the present invention provides a circuit breaker pull rod adjustment device, which can effectively prevent the pull rod from rotating when the nut is tightened, causing the length of the pull rod to change; and the circuit breaker pull rod adjustment device can solve the problem of low work efficiency caused by the overall non-fixation of the pull rod. The specific technical solution is as follows:

[0005] A circuit breaker pull rod adjustment device, comprising:

[0006] Base to support old and new tie rods;

[0007] A fixed end positioning part, comprising a fixed end screw positioning block, wherein the fixed end screw positioning block positions the first adjusting screws of the new pull rod and the old pull rod;

[0008] The adjustment end positioning part includes a first support block and a second support block; the first support block is used to support the second adjustment screw of the old pull rod, the second adjustment screw on the old pull rod is fixed to the base through a first fixing pin, and the second adjustment screw on the new pull rod is penetrated by a second fixing pin, and the second fixing pin can be slidably adjusted on the base;

[0009] A vernier caliper comprises a ruler body and a measuring head, wherein the ruler body is arranged between the two first support blocks and the second support blocks along the extension direction of the pull rod, and the measuring head is slidably connected to the ruler body, and a movable limit pin is provided on one side of the measuring head; a fixed plate is provided away from the vernier caliper, and an elastic member is fixedly connected between the fixed plate and the measuring head, and the elastic member pulls the measuring head to slide.

[0010] Preferably, a sliding groove is provided at the bottom of the new pull rod;

[0011] The bottom end of the second fixing pin slides in the sliding groove.

[0012] Preferably, the first adjusting screw and the second adjusting screw of the new pull rod are respectively provided with a pressing portion;

[0013] The clamping part comprises a support seat, a connecting plate with an inclined surface is arranged on the top of the support seat, a first U-shaped pressure rod is rotatably connected to the top of the inclined surface of the connecting plate, and a pressure column is arranged at the end of the first U-shaped pressure rod;

[0014] A second U-shaped pressure rod is provided on both sides of the first U-shaped pressure rod, and the bottom of the second U-shaped pressure rod is rotatably connected to the bottom end of the inclined surface of the connecting plate;

[0015] A pressing plate is rotatably connected to the middle of the second U-shaped pressing rod, and the other end of the pressing plate is rotatably connected to two sides of the first U-shaped pressing rod through a latch.

[0016] Preferably, the base is further provided with a middle screw rod adjustment fixing portion, and the middle screw rod adjustment fixing portion is located on one side of the new pull rod;

[0017] The middle screw rod adjustment fixing part includes a locking block, a screw rod, a sliding rod, a slider, a nut connecting seat and a fixing wrench;

[0018] The two ends of the screw rod respectively pass through the two bearing seats and pass through the locking block. The screw rod is sleeved with a screw rod copper sleeve. A sliding rod is provided between the two ears of the bearing seats. A slider is slidably connected to the sliding rod. A connecting block is connected to the slider. The connecting block is fixedly connected to the screw rod copper sleeve. The nut connecting seat is connected to the screw rod copper sleeve. The fixed wrench is rotatably connected to the top of the nut connecting seat through a connecting rod.

[0019] The screw rod is located at one end outside the base and is fixedly connected with a hand-cranked turntable.

[0020] Preferably, the fixed-end screw positioning block also includes a U-shaped fixing block, and two fixing holes are opened on the top of the U-shaped fixing block. Each of the fixing holes is plugged with a positioning pin corresponding to the first adjusting screw circular hole of the old pull rod and the new pull rod.

[0021] Preferably, the adjustment end positioning part further comprises a third support block, and the top of the third support block is provided with two arc grooves, and the two arc grooves are used to support the first adjustment screws of the old pull rod and the new pull rod respectively.

[0022] Preferably, a latch fixing block is fixed on the base located on one side of the old pull rod, and a sliding hole corresponding to the limit latch is provided on the latch fixing block, and the limit latch slides in the sliding hole.

[0023] Preferably, a limiting hole is provided on one side of the sliding hole, and a protruding limiting plate is provided on the limiting latch. The limiting plate is clamped on the limiting hole and can slide freely in the limiting hole.

[0024] Preferably, the bottom of the vernier caliper is provided with two spaced-apart ruler support seats, the bottom of the ruler support seat is provided with a slot, the two ends of the ruler body are respectively connected to the two slots, and a cover plate is provided at the connection between the ruler and the slot.

[0025] Preferably, a triangular clamping block is provided at one end of the measuring head, and the triangular clamping block can be clamped between the two first supporting blocks and the second supporting blocks.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. In the present invention, after the center distance of the circular holes at both ends of the new pull rod is adjusted to be roughly similar to that of the old pull rod, the first adjusting screw at one end is first fixed on the fixing pin, and then the middle screw is rotated with a wrench to move the first fixing pin at the other end of the new pull rod to the same position as the second fixing pin of the old pull rod, and then the adjusting screw of the new pull rod is clamped, and finally the nut is tightened; this effectively prevents the pull rod of the circuit breaker from rotating when the nut is tightened, causing the length of the pull rod to change, and can solve the problem of low work efficiency caused by the overall lack of fixation of the pull rod. At the same time, it can accurately locate the lengths of the new and old pull rods, and adjust the length of the new pull rod to be consistent with the length of the old pull rod.

[0028] 2. In the present invention, a fixed wrench with an adjustable angle is provided on the intermediate screw adjustment fixing part. When the nut is tightened after the pull rod length is adjusted, the intermediate screw is fixed to prevent rotation, which can limit the freedom of the pull rod. The pull rod adjustment efficiency is high and does not require personnel time. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. In all drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0030] Figure 1is a perspective view of the device of the present invention;

[0031] Figure 2 For the present invention Figure 1 Enlarged view of point A in the middle;

[0032] Figure 3 For the present invention Figure 1 Enlarged view of point B in the middle;

[0033] Figure 4 It is another perspective view of the present invention;

[0034] Figure 5 It is a top view of the present invention.

[0035] 1-base, 2-old tie rod, 3-new tie rod, 4-fixed end screw positioning block, 5-first adjusting screw, 6-first support block, 7-second support block, 8-second adjusting screw, 9-first fixing pin, 10-second fixing pin, 11-ruler, 12-measuring head, 13-limiting pin, 14-fixing plate, 15-spring, 16-middle adjusting screw, 17-sliding groove, 18-support seat, 19-connecting plate, 20-first U-shaped pressure rod, 21-pressure column, 22 -The second U-shaped pressure rod, 23-pressure plate, 24-locking block, 25-screw rod, 26-sliding rod, 27-sliding block, 28-nut connecting seat, 29-fixing wrench, 30-connecting rod, 31-hand crank turntable, 32-locating pin, 33-third supporting block, 34-arc groove, 35-pin fixing block, 36-limiting plate, 37-ruler supporting seat, 38-cover plate, 39-triangular clamp block, 40-nut, 41-locking bolt, 42-rotating handle, 43-handle rope buckle. DETAILED DESCRIPTION

[0036] The technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all of the embodiments. Based on the embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0038] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If the terms "first", "second", "third" are described, they are only used for the purpose of description and distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0040] Example 1

[0041] See also Figure 1-5 A circuit breaker pull rod adjustment device, comprising a base 1 for supporting an old pull rod 2 and a new pull rod 3; a fixed end positioning portion, comprising a fixed end screw positioning block 4, the fixed end screw positioning block 4 positions the first adjustment screw 5 of the new pull rod 3 and the old pull rod 2; the adjustment end positioning portion, comprising a first support block 6 and a second support block 7; the first support block 6 is used to support the second adjustment screw 8 of the old pull rod 2, the second adjustment screw 8 on the old pull rod 2 is fixed to the base 1 by a first fixing pin 9, and the second adjustment screw 8 on the new pull rod 3 is fixed to the base 1 by a first fixing pin 9. The adjusting screw 8 is penetrated by a second fixing pin 10, and the second fixing pin 10 can be slidably adjusted on the base 1; the vernier caliper, the vernier caliper includes a ruler body 11 and a measuring head 12, the ruler body 11 is arranged between the first support block 6 and the second support block 7 along the extension direction of the pull rod, the measuring head 12 is slidably connected to the ruler body 11, and a movable limit pin 13 is provided on one side of the measuring head 12; a fixing plate 14 is provided away from the vernier caliper, and an elastic member is fixedly connected between the fixing plate 14 and the measuring head 12, and the elastic member pulls the measuring head 12 to slide freely.

[0042] In the above scheme, the old circuit breaker pull rod hereinafter referred to as the old pull rod 2 and the new circuit breaker pull rod hereinafter referred to as the new pull rod 3 have the same structure, specifically including a first adjusting screw 5 and a second adjusting screw 8 at both ends and a middle adjusting screw 16, and a nut 40 is provided between the first adjusting screw 5 and the middle adjusting screw 16 and between the second adjusting screw 8 and the middle adjusting screw 16. The length of the pull rod can be adjusted by rotating the middle adjusting screw 16. When working, the fixed end screw positioning block 4 is aligned with the old pull rod 2 and the new pull rod 3. The first adjustment plays a fixing role, and the second adjustment screw 8 at the other end of the old pull rod 2 and the new pull rod 3 is supported by the first support block 6 and the second support block 7. The old pull rod 2 and the new pull rod 3 are supported side by side above the base 1 and are located on the same horizontal line. The ends of the first adjustment screw 5 and the second adjustment screw 8 are both provided with round holes. Handle rope buckles 43 are also provided on the four corners of the base 1 to facilitate tying the rope to the handle rope buckle 43 for free movement. The bottom is also provided with four supporting feet distributed at the four corners.

[0043] During the specific work, the old pull rod 2 is placed as a whole into the device, the round hole at one end of the first adjusting screw 5 of the old pull rod 2 is placed in the positioning pin 32 of the fixed end of the device, and the second adjusting screw 8 at the other end of the old pull rod 2 is the adjusting end. The round hole of the second adjusting screw 8 of the old pull rod 2 is inserted into the first positioning pin 32 of the adjusting end; the limit pin on the vernier caliper is pushed open, and the vernier caliper is in the elastic part. In this embodiment, the elastic part is two springs 15. After the two springs 15 are pressed against the positioning pin 32 on the old pull rod 2 under the pulling force, the reset button of the vernier caliper is pressed to record the reference value of the length of the old pull rod 2. Pull back the vernier caliper head 12, and after roughly adjusting the length of the new tie rod 3 to be consistent with the old tie rod 2, put the round hole at one end of the first adjusting screw 5 of the new tie rod 3 into the positioning pin 32 at the fixed end of the device, and insert the round hole on the second adjusting screw 8 at the adjusting end into the adjusting first fixing pin 9; loosen the limit pin 13 of the vernier caliper, so that the vernier caliper rests against the second fixing pin 10 of the new tie rod 3, turn the middle adjusting screw 16 of the tie rod, and adjust the length of the new tie rod 3 according to the value on the vernier caliper. When the value of the vernier caliper returns to zero, the length of the new tie rod 3 is adjusted to be consistent with that of the old tie rod 2; close the clamping clamps that fix the tie rods at both ends, adjust the angle of the middle fixing wrench 29, fix the new tie rod 3 as a whole, and then tighten the nut 40 to complete the length adjustment of the new tie rod 3.

[0044] As a further embodiment, a sliding groove 17 is provided at the bottom of the new tie rod 3; the bottom end of the second fixing pin 10 slides in the sliding groove 17. It can be understood that a limit seat corresponding to the second adjusting screw 8 of the new tie rod 3 is fixed on the base 1, and a sliding groove 17 is provided on the limit seat. When the new tie rod 3 is adjusted using a vernier caliper, the bottom end of the second fixing pin 10 slides on the sliding groove 17, thereby adjusting the length of the new tie rod 3.

[0045] As a further embodiment, the first adjusting screw 5 and the second adjusting screw 8 of the new pull rod 3 are respectively provided with a clamping portion; the clamping portion includes a support seat 18, a connecting plate 19 with an inclined surface is arranged on the top of the support seat 18, the top end of the inclined surface of the connecting plate 19 is rotatably connected with a first U-shaped pressure rod 20, and a pressure column 21 is arranged at the end of the first U-shaped pressure rod 20; second U-shaped pressure rods 22 are arranged on both sides of the first U-shaped pressure rod 20, and the bottom of the second U-shaped pressure rod 22 is rotatably connected to the bottom end of the inclined surface of the connecting plate 19; a pressure plate 23 is rotatably connected to the middle part of the second U-shaped pressure rod 22, and the other end of the pressure plate 23 is rotatably connected to the two side edges of the first U-shaped pressure rod 20 through a latch. It can be understood that when the pressing part presses the second adjusting screw 8 of the new tie rod 3, it first pushes the second U-shaped pressure rod 22 downward. During the pushing process, the pressure plate 23 presses the first U-shaped pressure rod 20 under the action of the latch, so that the first U-shaped rod drives the pressure column 21 to press the first adjusting screw 5 and the second adjusting screw 8 after adjusting the length of the new tie rod 3, and then tightens the nut 40 to complete the length adjustment of the new tie rod 3.

[0046] As a further embodiment, a middle screw adjustment fixing part is also provided on the base 1, and the middle screw adjustment fixing part is located on one side of the new pull rod 3; the middle screw adjustment fixing part includes a locking block 24, a screw 25, a sliding rod 26, a slider 27, a nut 40 connecting seat 28 and a fixed wrench 29; the two ends of the screw 25 pass through the two bearing seats and pass out of the locking block 24 respectively, and a screw 25 copper sleeve is sleeved on the screw 25, and a sliding rod 26 is provided between the two ear bearing seats, and a slider 27 is slidably connected to the sliding rod, and a connecting block is connected to the slider 27, and the connecting block is fixedly connected to the copper sleeve of the screw 25, the nut 40 connecting seat 28 is connected to the copper sleeve of the screw 25, and the fixed wrench 29 is rotatably connected to the top of the nut 40 connecting seat 28 through a connecting rod 30; the screw 25 is located at one end on the outer side of the base 1 and is fixedly connected to a hand-cranked turntable 31. It can be understood that after the vernier caliper completes the adjustment of the length of the new tie rod 3, the hand-cranked turntable 31 is rotated, the screw rod 25 rotates accordingly, and the slider 27 on the screw rod 25 slides on the slide rod, so that the nut 40 connection seat 28 slides, so that the angle of the fixing wrench 29 is adjusted and fixed through the connecting rod 30, and after the length adjustment of the new tie rod 3 is completed, the entire new tie rod 3 is prevented from rotating when the nut 40 is turned. It is also explained that a threaded hole is provided on the outer locking block 24, the threaded hole is connected to the position where the screw rod 25 passes, and a locking bolt 41 is threadedly connected to the threaded hole, and a rotating handle 42 is provided on the locking bolt 41, which can control the position of the locking bolt 41 on the threaded hole to lock and loosen the screw rod 25.

[0047] As a further embodiment, the fixed end screw positioning block 4 is a U-shaped fixing block, and two fixing holes are provided on the top of the U-shaped fixing block, and each fixing hole is plugged with a positioning pin 32 corresponding to the circular hole of the first adjusting screw 5 of the old tie rod 2 and the new tie rod 3. It can be understood that the U-shaped fixing block is used to fix the first adjusting screw 5 of the old tie rod 2 and the new tie rod 3 with the positioning pin 32, so as to facilitate the adjustment of the new tie rod 3 according to the length of the old tie rod 2.

[0048] As a further embodiment, the adjustment end positioning part further includes a third support block 33, and two arc grooves 34 are provided on the top of the third support block 33, and the two arc grooves 34 are respectively used to support the first adjustment screws 5 of the old pull rod 2 and the new pull rod 3. It can be understood that the arc grooves 34 are flush with the two protrusions of the U-shaped fixing block, and the arc grooves 34 match the profiles of the first adjustment screw 5, so that the first adjustment screws 5 of the two pull rods can be better fixed on the fixed end screw positioning block 4, and the length adjustment of the new pull rod 3 can be well fixed.

[0049] As a further embodiment, a latch fixing block 35 is fixed on the base 1 located on one side of the old pull rod 2, and a sliding hole corresponding to the limit latch 13 is provided on the latch fixing block 35, and the limit latch 13 slides in the sliding hole. It can be understood that the latch fixing plate 14 is an L-shaped plate, one end of which is fixed to the upper side of the base 1, and the other end protrudes from the surface of the base 1. The above-mentioned sliding hole is opened on one side of the L-shaped plate, which is not shown in the figure. When the measuring head 12 on the vernier caliper needs to be limited or released, the free sliding limit latch 13 can be realized.

[0050] As a further embodiment, a limit hole is provided on one side of the sliding hole, and a protruding limit plate 36 is provided on the limit pin 13. The limit plate 36 is engaged with the limit hole and can slide freely in the limit hole. It can be understood that the limit plate 36 can slide in the limit hole to prevent the limit pin 13 from sliding off the sliding hole, and can more effectively control the sliding distance of the limit pin 13.

[0051] As a further embodiment, the bottom of the vernier caliper is provided with two spaced ruler support seats 3718, the bottom of the ruler support seat 3718 is provided with a card slot, the two ends of the ruler body 11 are respectively connected to the two card slots, and the connection between the ruler and the card slot is covered with a cover plate 38. It can be understood that the ruler support seat 3718 can better support the ruler, and the cover plate 38 cooperates with the card slot to better fix the two ends of the ruler body 11 between the two ruler support seats 3718.

[0052] As a further embodiment, a triangular clamping block (39) is provided at one end of the measuring head (12), and the triangular clamping block (39) can be clamped between the two first support blocks (6) and the second support block (7). It can be understood that the triangular clamping block can better clamp the measuring head (12) between the two support blocks, and also facilitate the clamping of the limit pin (13) on the triangular clamping block (39) to limit the sliding of the measuring head (12).

[0053] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A circuit breaker pull rod adjustment device, characterized in that: include: A base (1) for supporting the old tie rod (2) and the new tie rod (3); The fixed end positioning part comprises a fixed end screw positioning block (4), wherein the fixed end screw positioning block (4) positions the first adjusting screws (5) of the new pull rod (3) and the old pull rod (2); The adjustment end positioning portion comprises a first support block (6) and a second support block (7); the first support block (6) is used to support the second adjustment screw (8) of the old pull rod (2); the second adjustment screw (8) on the old pull rod (2) is fixed to the base (1) via a first fixing pin (9); the second adjustment screw (8) on the new pull rod (3) is provided with a second fixing pin (10); the second fixing pin (10) can be slidably adjusted on the base (1); A vernier caliper, the vernier caliper comprising a ruler body (11) and a measuring head (12), the ruler body (11) being arranged between the first supporting block (6) and the second supporting block (7) along the extension direction of the pull rod, the measuring head (12) being slidably connected to the ruler body (11), and a movable limit pin (13) being arranged on one side of the measuring head (12); a fixing plate (14) being arranged away from the vernier caliper, an elastic member being fixedly connected between the fixing plate (14) and the measuring head (12), and the elastic member pulling the measuring head (12) to slide freely.

2. A circuit breaker pull rod adjustment device according to claim 1, characterized in that: The bottom of the new pull rod (3) is provided with a sliding groove (17); The bottom end of the second fixing pin (10) slides in the sliding groove (17).

3. A circuit breaker pull rod adjustment device according to claim 1, characterized in that: The first adjusting screw rod (5) and the second adjusting screw rod (8) of the new pull rod (3) are both provided with a pressing portion correspondingly; The clamping portion comprises a support seat (18), a connecting plate (19) with an inclined surface is arranged on the top of the support seat (18), a first U-shaped pressing rod (20) is rotatably connected to the top of the inclined surface of the connecting plate (19), and a pressing column (21) is arranged at the end of the first U-shaped pressing rod (20); Second U-shaped pressure rods (22) are provided on both sides of the first U-shaped pressure rod (20), and the bottom of the second U-shaped pressure rod (22) is rotatably connected to the bottom end of the inclined surface of the connecting plate (19); The middle part of the second U-shaped pressure rod (22) is rotatably connected with a pressure plate (23), and the other end of the pressure plate (23) is rotatably connected to the two sides of the first U-shaped pressure rod (20) through a latch.

4. A circuit breaker pull rod adjustment device according to claim 1, characterized in that: The base (1) is also provided with a middle screw rod adjustment fixing portion, and the middle screw rod adjustment fixing portion is located on one side of the new pull rod (3); The middle screw rod adjustment fixing part comprises a locking block (24), a screw rod (25), a sliding rod (26), a slider (27), a nut (40), a connecting seat (28) and a fixing wrench (29); The two ends of the screw rod (25) pass through the two bearing seats and pass through the locking block (24), the screw rod (25) is sleeved with a screw rod (25) copper sleeve, a sliding rod (26) is provided between the two ears of the bearing seats, the sliding rod is slidably connected with a slider (27), the slider (27) is connected with a connecting block, the connecting block is fixedly connected to the screw rod (25) copper sleeve, the nut (40) connecting seat (28) is connected to the screw rod (25) copper sleeve, and the fixed wrench (29) is rotatably connected to the top of the nut (40) connecting seat (28) through a connecting rod (30); One end of the screw rod (25) located outside the base (1) is fixedly connected to a hand-cranked turntable (31).

5. The circuit breaker pull rod adjustment device according to claim 1, characterized in that: The fixed end screw positioning block (4) is a U-shaped fixing block, and two fixing holes are provided on the top of the U-shaped fixing block. A positioning pin (32) corresponding to the circular hole of the first adjusting screw (5) of the old pull rod (2) and the new pull rod (3) is inserted into each of the fixing holes.

6. A circuit breaker pull rod adjustment device according to claim 5, characterized in that: The adjustment end positioning portion also includes a third support block (33), and two arc grooves (34) are provided on the top of the third support block (33). The two arc grooves (34) are used to support the first adjustment screws (5) of the old pull rod (2) and the new pull rod (3), respectively.

7. A circuit breaker pull rod adjustment device according to claim 1, characterized in that: A latch fixing block (35) is fixed on the base (1) located on one side of the old pull rod (2), and a sliding hole corresponding to the limit latch (13) is provided on the latch fixing block (35), and the limit latch (13) slides in the sliding hole.

8. A circuit breaker pull rod adjustment device according to claim 7, characterized in that: A limiting hole is provided on one side of the sliding hole, and a protruding limiting plate (36) is provided on the limiting latch (13). The limiting plate (36) is snap-fitted to the limiting hole and can slide freely in the limiting hole.

9. A circuit breaker pull rod adjustment device according to claim 1, characterized in that: The bottom of the vernier caliper is provided with two ruler support seats (37) (18) arranged at intervals, and the bottom of the ruler support seat (37) (18) is provided with a clamping slot, and the two ends of the ruler body (11) are respectively clamped on the two clamping slots, and a cover plate (38) is provided at the connection between the ruler and the clamping slot.

10. A circuit breaker pull rod adjustment device according to claim 1, characterized in that: A triangular clamping block (39) is provided at one end of the measuring head (12), and the triangular clamping block (39) can be clamped between the two first supporting blocks (6) and the second supporting block (7).

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