阅读说明：本技术 一种冷压连接条形无励磁分接开关 (Cold-pressed connection strip-shaped off-circuit tap-changer ) 是由 何幼林 何起训 于 2020-04-24 设计创作，主要内容包括：本发明涉及一种冷压连接条形无励磁分接开关,由开关座、传动机构、定触头、动触头组成,所述的传动机构由手柄罩、压圈定位件、法兰盘、齿轮轴及滑动齿条组成,齿轮轴的D形轴端插入手柄罩的D形孔内,齿轮轴的齿轮端与滑动齿条啮合,压圈定位件固定在法兰盘上,法兰盘固定在开关座上,手柄罩上设有的多个定位槽分别与压圈定位件上设有的定位键匹配,滑动齿条安装在开关座上设有的通孔槽内；动触头安装约束在滑动齿条对应的部位；定触头固定在开关座对应的孔中；动触头与定触头对应弹性接触,通过传动机构中的手柄罩旋转带动齿轮轴驱动滑动齿条沿轨道直线移动,改变动触头与定触头接触的位置,以满足设计要求。(The invention relates to a cold-pressed connecting strip-shaped off-circuit tap-changer, which consists of a switch seat, a transmission mechanism, a fixed contact and a moving contact, wherein the transmission mechanism consists of a handle cover, a pressing ring positioning piece, a flange plate, a gear shaft and a sliding rack; the moving contact is arranged and restrained at the corresponding part of the sliding rack; the fixed contact is fixed in a hole corresponding to the switch seat; the moving contact is in corresponding elastic contact with the fixed contact, the handle cover in the transmission mechanism rotates to drive the gear shaft to drive the sliding rack to linearly move along the track, and the contact position of the moving contact and the fixed contact is changed to meet the design requirement.)

1. The utility model provides a cold pressing connection bar does not have excitation tapping switch, includes switch seat, drive mechanism, moving contact, decides the contact, its characterized in that: the transmission mechanism consists of a handle cover, a pressing ring positioning piece, a flange plate, a gear shaft and a sliding rack, wherein the D-shaped shaft end of the gear shaft is inserted into a D-shaped hole of the handle cover, the gear end of the gear shaft is meshed with the sliding rack, the pressing ring positioning piece is fixed on the flange plate, the flange plate is fixed on the switch seat, a plurality of positioning grooves arranged on the handle cover are respectively matched with positioning keys arranged on the pressing ring positioning piece, and the sliding rack is arranged in a through hole groove arranged on the switch seat; the moving contact is arranged and restrained at the corresponding part of the sliding rack; the fixed contact is fixed in a hole corresponding to the switch seat; the moving contact is in corresponding elastic contact with the fixed contact, and the handle cover in the transmission mechanism rotates to drive the gear shaft to drive the sliding rack to linearly move along the track, so that the contact position of the moving contact and the fixed contact is changed.

2. The cold-pressed connecting strip-shaped off-circuit tap-changer is characterized in that the switch base is formed by injection molding of plastic insulating materials, the appearance of the switch base is designed on the basis of a cuboid structure, the lower end part of the cuboid is designed into a long concave cavity, the thicknesses of two long sides of the concave cavity are different, the switch base is arranged according to three phases at the corresponding positions of the thick long sides, four through holes or six through holes are arranged in each phase, and the diameters of the through holes are tightly matched with the outer diameter of a fixed contact; a groove is arranged between two adjacent through holes in the same phase, and three grooves are arranged between two adjacent through holes in the same phase to increase the creepage distance; a groove is arranged on the thin long side of the concave cavity corresponding to each through hole on the thick long side, and the width and the depth of the groove are larger than the diameter of each through hole; two bosses with central screw holes are arranged on the corresponding positions of the inner top wall of the concave cavity along the length direction, and the central connecting line of the two bosses is parallel to the long edge of the concave cavity; a tubular boss is arranged at the corresponding position of one third of the length direction of the upper end surface of the cuboid, and three through holes are arranged at the upper end of the tubular boss along the circumference to fix the flange plate; a through hole groove is arranged in the concave cavity along the inner wall of the thin long edge and is communicated with the tubular boss on the upper end face.

3. The cold-pressed connection strip-shaped off-circuit tap-changer is characterized in that the handle cover integrates a handle and a rain cover and is formed by injection molding of an anti-aging plastic material, a boss is arranged in the center of the inner top of the handle cover, a D-shaped hole is formed in the middle of the boss, and the geometric dimension of the D-shaped hole is matched with a D-shaped shaft on a gear shaft; the opening part of the handle cover is provided with three positioning grooves or five positioning grooves at a specified angle along the circumference; an insert nut is arranged on the circumference of the handle cover opposite to the middle gear positioning groove; gear numbers and arrow-shaped grooves are arranged on the corresponding positions of the outer wall of the upper end part of the handle cover and the positioning grooves at the lower end in a one-to-one correspondence manner.

4. The cold-pressed connecting strip-shaped off-circuit tap-changer according to claim 1, characterized in that the pressing ring positioning piece is formed by injection molding of an anti-aging plastic material, is in a circular washer shape, has a central hole in a D-shaped shape and has one end part in a corresponding tapered hole; an arrow-shaped square key is axially arranged on the outer wall on one side of the D-shaped hole plane, and the axial symmetry plane of the arrow-shaped square key is vertically symmetrical to the axial direction of the D-shaped hole plane.

5. The cold-pressed connection strip-shaped off-circuit tap-changer according to claim 1, characterized in that the gear shaft is formed by embedding a gear which is formed by injection molding of a plastic insulating material into one end of a metal shaft, the other end of the metal shaft is a D-shaped shaft, and the plane axial direction of the D-shaped shaft is vertically symmetrical to a concave tooth-shaped axial symmetrical plane of the gear at the lower end.

6. The cold-pressed connecting strip-shaped off-circuit tap-changer is characterized in that the sliding rack is formed by injection molding of plastic insulating materials, the sliding rack is in a rectangular strip shape, three pairs of grooves are formed in one edge of the rectangular strip along the length direction, the positions of the grooves at two ends are symmetrical to that of the middle groove, and each pair of grooves is symmetrical to the thickness center line of the rectangular strip; a through hole is arranged at the middle position of each pair of grooves; a convex rack is arranged at one end of the other side of the rectangular bar along the length direction, and the symmetry line of the length direction of the rack is superposed with the symmetry lines of the positions of two adjacent pairs of grooves opposite to the rack; the number of teeth of the rack is odd, and the tooth form at the symmetrical line of the length direction of the rack is a convex tooth form; two through hole grooves are formed in the corresponding positions of the sliding rack along the length direction, the length direction of each through hole groove is parallel to the long edge of the sliding rack, and the length of each through hole groove is matched with the working stroke of the switch moving contact.

7. The cold-pressed connecting strip-shaped off-circuit tap-changer according to claim 1, characterized in that the flange is a step cylinder in shape, the diameter of the upper cylinder is small, the upper end part is of a D-shaped shaft structure and is provided with external threads, and the geometric dimension of the D-shaped shaft structure part is matched with the D-shaped hole on the clamping ring positioning piece; three screw holes are arranged at corresponding positions on the circumference of the lower cylinder so as to be fixed with the switch seat; a circular groove concentric with the cylinder is arranged on the plane where the lower cylinder is connected with the upper cylinder, and the geometric dimension of the circular groove is matched with that of the outer sealing ring; the center of the flange plate is provided with a step through hole, the aperture of the upper end of the step through hole is in movable fit with the diameter of a metal shaft in the gear shaft, and the aperture of the lower end of the step is in elastic fit with the outer diameter of an inner sealing ring on the gear shaft.

8. The cold-pressed connection strip-shaped off-circuit tap-changer according to claim 1, characterized in that the fixed contact is a section of copper tube, a concave rib is pressed in a direction perpendicular to an axis at a corresponding position of one end of the fixed contact, the length of the concave rib is larger than the outer diameter of the fixed contact, and the outer diameter of the fixed contact is tightly matched with a corresponding fixing hole on the switch base.

Technical Field

The invention relates to a cold-pressed connection strip-shaped off-circuit tap-changer which is applied to an oil-immersed distribution transformer.

Technical Field

In the distribution transformer industry of China, most oil-immersed distribution transformers are of planar iron core structures, namely three-phase coils of a transformer A, B, C are located in the same plane. The transformers of the type all adopt strip-shaped off-circuit tap changers, cold-pressed connection strip-shaped off-circuit tap changers are adopted below the capacity of 400KVA, namely, the tap leads of the transformers are connected with the fixed contacts of the cold-pressed connection strip-shaped off-circuit tap changers in a cold-pressed connection mode. The cold-pressed connection strip-shaped off-circuit tap changer used at present has the following defects:

1. the existing cold-pressed connecting bar-shaped off-circuit tap-changer structure is a combined structure, the structure is complex, the universality of parts and the traditional switch is not strong, and the production cost is high.

2. The main insulator of the existing cold-pressed connecting strip-shaped non-excitation tapping switch is processed by an epoxy glass cloth board machine, and harmful dust and noise can be generated in the processing process; the labor intensity of workers in processing is high and the environment is severe; the material is a thermosetting material, and processed leftover materials and waste products can not be recycled, so that the material is not beneficial to environmental protection.

Disclosure of Invention

Aiming at the defects of the existing product, the invention provides a cold-pressed connecting strip-shaped off-circuit tap-changer, which adopts an optimized composite design scheme in structure, so that the number of switch parts is minimized, the whole structure is compact, the mechanical strength is high, and the assembly is simpler; the plastic material injection molding process is adopted in the process, so that the production efficiency of parts is high, and the processing cost of products is reduced.

The utility model provides a cold pressing connection bar does not have excitation tapping switch, includes switch seat, drive mechanism, moving contact, decides the contact, its characterized in that: the transmission mechanism consists of a handle cover, a pressing ring positioning piece, a flange plate, a gear shaft and a sliding rack, wherein the D-shaped shaft end of the gear shaft is inserted into a D-shaped hole of the handle cover, the gear end of the gear shaft is meshed with the sliding rack, the pressing ring positioning piece is fixed on the flange plate, the flange plate is fixed on the switch seat, a plurality of positioning grooves arranged on the handle cover are respectively matched with positioning keys arranged on the pressing ring positioning piece, and the sliding rack is arranged in a through hole groove arranged on the switch seat; the moving contact is arranged and restrained at the corresponding part of the sliding rack; the fixed contact is fixed in a hole corresponding to the switch seat; the moving contact is in corresponding elastic contact with the fixed contact, and the handle cover in the transmission mechanism rotates to drive the gear shaft to drive the sliding rack to linearly move along the track, so that the contact position of the moving contact and the fixed contact is changed.

The switch base is formed by injection molding of a plastic insulating material, the appearance of the switch base is designed on the basis of a cuboid structure, the lower end part of the cuboid is designed into a long concave cavity, the thicknesses of two long sides of the concave cavity are different, the switch base is arranged according to three phases at corresponding positions of the thick long sides, each phase is provided with four through holes (3-gear switches) or six through holes (5-gear switches), the through holes are used for fixing fixed contacts, and the aperture of each through hole is tightly matched with the outer diameter of the fixed contacts; a groove is arranged between every two adjacent through holes, and three grooves are arranged between every two adjacent through holes to increase the creepage distance; a groove with the width and the depth larger than the diameter of the through hole is arranged at the position corresponding to the through hole of the thin long edge and the thick long edge, so that the fixed contact can be conveniently installed; two bosses with central screw holes are arranged on the corresponding positions of the inner top wall of the concave cavity along the length direction, and the central connecting line of the two bosses is parallel to the long edge of the concave cavity; the two short sides of the concave cavity are as thick as the thin long sides to ensure sufficient mechanical strength of the cavity. A tubular boss is arranged at a corresponding position of one third of the length direction of the upper end surface of the cuboid, and two reinforcing ribs are respectively arranged on two sides of the diameter symmetrical direction of the tubular boss along the length direction of the upper end surface of the cuboid in order to ensure that the tubular boss is connected with the upper end surface of the cuboid with enough mechanical strength; three through holes are arranged at the upper end of the tubular boss along the corresponding positions of the pipe wall so as to install a flange plate in the transmission mechanism. A through hole groove is formed in the concave cavity along the inner wall of the thin long edge and is communicated with the tubular boss, and the length position of the through hole groove is symmetrical to the center line of the tubular boss in the width direction of the upper end face of the cuboid. The length of the through hole groove is matched with the stroke of the sliding rack, and the width of the through hole groove is in sliding fit with the thickness of the sliding rack. Two bosses with central screw holes are arranged on the inner top wall of the concave cavity along the corresponding position of the length direction, and the connecting line of the central holes of the two bosses is parallel to the long edge of the concave cavity. The two bosses and the through hole groove are used for installing and restraining the sliding rack.

The handle cover integrates the handle and the rain cover into a whole and is formed by injection molding of an anti-aging plastic material, a boss is arranged in the center of the inner top of the handle cover, and three reinforcing ribs are arranged on the periphery of the boss and connected with the inner wall of the handle cover to ensure sufficient mechanical strength of the handle cover; a D-shaped hole is formed in the middle of the boss, and the geometric dimension of the D-shaped hole is matched with that of a D-shaped shaft on the gear shaft; the opening part of the handle cover is provided with three positioning grooves (3-gear switches) or five positioning grooves (5-gear switches) at a specified angle along the circumference, and the geometric dimensions of the positioning grooves are matched with positioning keys on a pressing ring positioning piece in the transmission mechanism; the plane axial direction of the D-shaped hole is vertically and symmetrically arranged with the axial symmetrical plane of the middle gear positioning groove, so as to ensure the uniqueness of the matching position of the handle cover and the gear; an insert nut is arranged on the circumference of the middle gear positioning groove opposite to the middle gear positioning groove and used for assembling a fastening screw to fix the handle cover; gear numbers and arrow-shaped grooves are correspondingly arranged at the corresponding positions of the outer wall of the upper end part of the handle cover and the positioning grooves of the lower end part one by one.

The pressing ring positioning piece is formed by injection molding of a plastic material, is in a circular washer shape, and has a D-shaped central hole and a corresponding conical hole at one end; the geometric dimension of the D-shaped hole is matched with the D-shaped part of the flange plate in the transmission mechanism so as to ensure the uniqueness of the position of the pressing ring positioning piece fixed on the flange plate; an arrow-shaped square key is axially arranged on the outer wall on one side of the D-shaped hole plane, and the axial symmetry plane of the arrow-shaped square key is vertically symmetrical to the axial direction of the D-shaped hole plane. The geometrical size of the arrow-shaped square key is matched with the positioning groove on the handle cover. To ensure accurate positioning.

The gear shaft is formed by embedding one end of a metal shaft into a gear which is formed by injection molding of a plastic insulating material. The other end of the metal shaft is a D-shaped shaft, and the axial plane of the D-shaped shaft is vertically and symmetrically arranged with a concave tooth-shaped axial symmetric plane of the lower end gear, so as to ensure the uniqueness that the sliding rack is positioned at the meshing position of the middle gear shaft and the sliding rack during assembly. The geometric dimension of the D-shaped shaft is matched with the D-shaped hole in the handle cover in the transmission mechanism. 3 annular grooves are arranged at corresponding positions of the upper part of the joint of the metal shaft and the gear, and the geometric dimension of the grooves is matched with that of the inner sealing ring so as to fix the inner sealing ring.

The sliding rack is formed by injection molding of a plastic insulating material, the sliding rack is in a rectangular strip shape, three pairs of grooves are formed in one edge of the rectangular strip along the length direction, the positions of the grooves at two ends are symmetrical to that of the middle groove, and each pair of grooves is symmetrical to the central line of the thickness of the rectangular strip; a through hole is arranged at the middle position of each pair of grooves, and raised reinforcing ribs are arranged on two sides of each groove. The groove is used for installing the movable contact group. One end of the other side of the rectangular strip is provided with a convex rack along the length direction, and the symmetrical line of the length of the rack is superposed with the symmetrical lines of the positions of the two pairs of grooves opposite to the rack. The number of teeth of the rack is odd, and the tooth form at the symmetrical line of the length direction of the rack is a convex tooth form, so that the uniqueness of the meshing position of the sliding rack and the gear shaft when the sliding rack is at the middle gear during assembly is ensured. The length of the convex rack is matched with the working stroke of the switch moving contact. Two through hole grooves are formed in the corresponding positions of the sliding racks along the length direction, the length direction of each through hole groove is parallel to the long edge of each sliding rack, and each through hole groove is used for installing each sliding rack. The width of the groove is matched with the diameter of the fixing bolt, and the length of the groove is matched with the working stroke of the switch moving contact.

The flange plate is in a stepped cylinder shape, the diameter of the upper cylinder is small, the upper end part of the upper cylinder is in a D-shaped shaft structure and is provided with external threads, and the geometric dimension of the D-shaped shaft structure part is matched with the D-shaped hole in the pressing ring positioning piece so as to ensure the uniqueness of the position of the pressing ring positioning piece fixed on the flange plate; 3 screw holes are arranged at corresponding positions on the circumference of the lower cylinder so as to be fixed with the switch seat; a circular groove concentric with the cylinder is arranged on the plane where the lower cylinder is connected with the upper cylinder, and the geometric dimension of the circular groove is matched with that of the outer sealing ring; the center of the flange plate is provided with a step through hole, the aperture of the upper step of the step through hole is movably matched with the diameter of the insert metal shaft in the gear shaft, and the aperture of the lower step is elastically matched with the outer diameter of the inner sealing ring on the gear shaft, so that the inner sealing ring is guaranteed to have enough compression amount to meet the sealing performance of the switch.

The fixed contact is a section of copper tube, a concave rib is pressed in the direction perpendicular to the axis of the fixed contact at the corresponding position of one end of the fixed contact, the length of the concave rib is larger than the outer diameter of the fixed contact, and the outer diameter of the fixed contact is tightly matched with a corresponding fixing hole in the switch seat. The fixing mode is as follows: one end of the fixed contact, which is not pressed with the concave rib, is pressed into the hole from the inner side of the fixed hole corresponding to the switch seat, so that the concave rib is tightly attached to the inner side wall of the fixed hole and the length direction of the concave rib is ensured to be parallel to the length direction of the switch seat; and then, tightly attaching a tool to the outer side wall of the fixed hole to press a concave rib in the axial vertical direction of the fixed contact, so that the length of the concave rib is greater than the outer diameter of the fixed contact. The fixed contact is fixed on the switch seat by using a mode of large two sides and tight middle.

The moving contact and the force application element of the switch of the invention are commonly used with the traditional products of the company and are not described in detail herein.

The invention has the characteristics that:

1. the invention adopts an optimized composite design scheme in structure, so that the number of switch parts is minimized, the whole structure is compact, the mechanical strength is high, and the assembly is simpler; the plastic material injection molding process is adopted in the process, so that the production efficiency of parts is high, and the processing cost of products is reduced.

2. In the invention, all the insulating components are injection molded by adopting plastic insulating materials, so that the automatic production is easy to realize and the production efficiency is improved; during processing, no dust, no dry sound and no peculiar smell exist, so that the labor intensity of workers is greatly reduced, and the processing environment is improved; leftover materials and waste products generated by processing parts can be recycled, and the environment is protected.

3. The invention completely overcomes the defects of the prior product, is a material-saving and environment-friendly product, and can be widely popularized!

Drawings

FIG. 1a is a front view of the present invention.

FIG. 1b is a cross-sectional view M-M of FIG. 1 a.

Fig. 1c is a bottom view of the present invention.

FIG. 1d is a top view of the present invention with the handle cover, the outer nut, the clamping ring positioning member, and the flange removed.

Fig. 2a is a front view of the switch base of the present invention.

Fig. 2b is a cross-sectional view P-P of fig. 2 a.

Fig. 2c is a bottom view of the switch base of the present invention.

Fig. 2d is a top view of the switch base of the present invention.

Fig. 3a is a front view of the sliding rack of the present invention.

Fig. 3b is a cross-sectional view I-I of fig. 3 a.

Fig. 3c is a top view of the sliding rack of the present invention.

Fig. 4a is a front view of the handle cover of the present invention.

Fig. 4b is a cross-sectional view of fig. 4 aN-N.

Fig. 4c is a bottom view of the handle cover of the present invention.

Fig. 4d is a top view of the handle cover of the present invention.

Fig. 4e is an expanded view of the handle cover of the present invention.

Detailed Description

The invention is further described with reference to the accompanying drawings and examples.

Specifically described by the drawings 1a, 1b, 1c and 1d, the cold-pressed connection strip-shaped non-excitation tap switch comprises a switch seat, a transmission mechanism, a moving contact and a fixed contact, wherein the transmission mechanism comprises a sliding rack, a gear shaft, a handle cover, a pressing ring positioning piece and a flange plate.

The switch base is a serial number 15 in fig. 1b, the specific structure is shown in fig. 2a, fig. 2b, fig. 2c and fig. 2d, the switch base 15 is formed by injection molding of a plastic insulating material, the appearance structure of the switch base is designed on the basis of a cuboid structure, the lower end part of the cuboid is designed to be a long concave cavity structure, the thicknesses of two long sides of the concave cavity are different, the switch base is arranged according to three phases at corresponding positions of the thick long sides, each phase is provided with four through holes (3-gear switch) or six through holes (5-gear switch), and the aperture is tightly matched with the outer diameter of the fixed contact 11; the fixed contact 11 is a section of copper tube, a concave rib is pressed in the direction perpendicular to the axis of the fixed contact 11 at the corresponding position of one end of the fixed contact 11, the length of the concave rib is larger than the outer diameter of the fixed contact, and the outer diameter of the fixed contact 11 is tightly matched with a corresponding fixing hole on the switch base 15. The fixing mode is as follows: one end of the fixed contact 11, which is not pressed with the concave rib, is pressed into the hole from the inner side of the fixed hole corresponding to the switch seat 15, so that the concave rib is tightly attached to the inner side wall of the fixed hole and the length direction of the concave rib is ensured to be parallel to the length direction of the switch seat 15; and then, tightly attaching the tool to the outer side wall of the fixed hole, and pressing a concave rib in the axial vertical direction of the fixed contact to enable the length of the concave rib to be larger than the outer diameter of the fixed contact. The fixed contact is firmly fixed on the switch seat 15 by using a mode of large two sides and tight middle; a tubular boss is arranged at the corresponding position of one third of the length direction of the upper end surface of the cuboid, three through holes are arranged at the corresponding position along the pipe wall at the upper end of the tubular boss so as to be convenient for installing a flange plate 4 in the transmission mechanism, and a through hole groove is arranged in the concave cavity along the inner wall of the thin long edge and is communicated with the tubular boss; two bosses with central screw holes are arranged at corresponding positions along the length direction on the inner top wall of the concave cavity, and the through hole groove and the two bosses are used for mounting a constraint sliding rack.

The specific structure of the sliding rack 14 of the transmission mechanism is shown in fig. 3a, 3b and 3 c. The sliding rack 14 is injection molded from a plastic insulating material. The sliding rack is in a rectangular strip structure, three pairs of grooves are formed in one side of the rectangular strip along the length direction, and a through hole is formed in the middle of each pair of grooves and used for installing and restraining the moving contact 10. As shown in fig. 1b, the movable contact 10 is symmetrically arranged in the groove according to requirements according to two pieces per groove, the pin 13 penetrates through the through holes on the grooves of the movable contact 10 and the sliding rack 14, and the spring 12 and the retainer ring restrain the movable contact 10 in the groove of the sliding rack 14. One end of the other side of the rectangular strip of the sliding rack 14 is provided with a convex rack along the length direction, the number of the teeth of the rack is odd, and the tooth form at the symmetrical line of the length direction of the rack is a convex tooth form. Two through hole grooves are formed in the corresponding positions of the sliding racks along the length direction and used for restraining the sliding racks. Assembly between a sliding rack equipped with moving contacts 10 and a switch block 15 equipped with fixed contacts 11: the rack part on the sliding rack is sleeved into a through hole groove of the switch seat, the movable contact 10 is kept in elastic contact with the fixed contact 11, the sliding rack 14 is adjusted, the movable contact 10 is in contact with the fixed contact 11 at a middle gear, then two insulating bolts respectively penetrate through the two through hole grooves of the sliding rack 14 and are screwed into screw holes of two bosses on the top wall of a groove of the switch seat 15, and the sliding rack is ensured to slide stably and freely.

A gear shaft 2 in the transmission mechanism is formed by embedding a gear which is formed by injection molding of a plastic insulating material into one end of a metal shaft, the other end of the metal shaft 2 is a D-shaped shaft, and the plane axial direction of the D-shaped shaft is vertically symmetrical to a concave tooth-shaped axial symmetrical plane of a gear at the lower end. Assembling a gear shaft: according to the figure 1b, three inner sealing rings 7 are firstly arranged on the gear shaft 2, then the gear shaft 2 is inserted into the tubular boss of the switch base 15 according to the direction shown in the figure 1D, and the movable contact 10 of the switch is kept at the middle gear, so that the concave tooth form right below the plane of the D-shaped shaft is correctly meshed with the convex tooth form right in the middle of the sliding rack.

The flange plate 4 in the transmission mechanism is in a step cylinder shape, the diameter of the upper cylinder is small, the upper end part of the upper cylinder is in a D-shaped shaft structure and is provided with external threads, and the D-shaped shaft structure part is used for installing a pressing ring positioning piece with a D-shaped hole; three screw holes are arranged at corresponding positions on the circumference of the lower cylinder so as to be fixed with the switch seat 15; a circular groove concentric with the cylinder is arranged on the plane where the lower cylinder is connected with the upper cylinder and used for installing an outer sealing ring; the center of the flange plate 4 is provided with a step through hole, the aperture of the upper end of the step through hole is movably matched with the diameter of the metal shaft in the gear shaft 2, and the aperture of the lower end of the step is elastically matched with the outer diameter of the inner sealing ring on the gear shaft. Assembling the flange plate: as shown in FIG. 1b, the large-end stepped hole of the flange 4 is sleeved into the gear shaft 2, three fixing screw holes on the flange 4 are overlapped with the fixing holes of the tubular boss of the switch seat 15, and then the three fixing screw holes are fixed by a fastening piece 9.

A pressing ring positioning piece 5 in the transmission mechanism is formed by injection molding of an anti-aging plastic material, is shaped like a circular washer, and has a central hole which is a D-shaped hole and one end part which is a corresponding conical hole; an arrow-shaped square key is axially arranged on the outer wall on one side of the D-shaped hole plane, and the axial symmetry plane of the arrow-shaped square key is perpendicular to the axial symmetry plane of the D-shaped hole plane. Assembling the pressing ring positioning piece 5: according to the figure 1b, firstly two outer sealing rings 8 are arranged on a flange plate 4, then one end of a pressing ring positioning piece with a tapered hole is sleeved into the flange plate 4 downwards according to the direction shown in the figure 1D, the D-shaped hole is matched with the D-shaped part of the flange plate, and then an outer nut 3 is screwed on the screw part of the flange plate 4 for fixing.

The specific structure of the handle cover 1 in the transmission mechanism is shown in fig. 4a, 4b, 4c, 4d, and 4 e. The handle cover 1 integrates the handle and the rain cover into a whole and is formed by injection molding of an anti-aging plastic material, a boss is arranged in the center of the inner top of the handle cover 1, a D-shaped hole is formed in the middle of the boss, and the D-shaped hole is matched with a D-shaped shaft on the gear shaft 4; the opening part of the handle cover 1 is provided with three positioning grooves (3-gear switch) or five positioning grooves (5-gear switch) at a specified angle along the circumference; an insert nut is arranged on the circumference of the handle cover 1 opposite to the middle gear positioning groove; gear numbers and gear indication concave arrows are arranged on the corresponding positions of the outer wall of the upper end part of the handle cover 1 and the positioning grooves at the lower end in a one-to-one correspondence mode. Mounting of the handle cover 1: according to the figure 1b, firstly, a fixing screw 6 and a check ring are installed on an insert nut on a handle cover 1, then the fixing screw 6 is unscrewed, then a D-shaped hole of a gear shaft on the D-shaped hole cover of the handle cover 1 is covered, the handle cover is pressed downwards, an arrow-shaped square key on a pressing ring positioning piece 5 is just clamped into a positioning groove of a middle gear of the handle cover 1, a concave arrow of the middle gear on the handle cover 1 and an arrow-shaped positioning piece on the pressing ring positioning piece 5 are just opposite to each other and are positioned on a straight line, and meanwhile, a moving contact 10 is also positioned on the middle gear. Finally, the fixing screw 6 is tightened. The cold-pressed connecting strip-shaped non-excitation strip-shaped tapping switch is assembled.

The invention relates to a method for using a cold-pressed connection non-excitation strip tap switch, which comprises the following steps:

as shown in fig. 1b, the fixing screw 6 is loosened, the handle cover 1 is lifted upwards to enable the positioning groove to be disengaged from the arrow-shaped positioning block on the pressing ring positioning piece 5, the D-shaped hole in the handle cover is kept to be not completely disengaged from the D-shaped shaft in the gear shaft 4, the handle cover 1 is rotated back and forth for several times and then is rotated to a required gear, the handle cover 1 is pressed downwards to enable the gear groove of the required gear to clamp the arrow-shaped square key on the pressing ring positioning piece 5, and the fixing screw 6 is screwed.