High-efficiency and high-characteristic transformer

Abstract

The invention discloses a high-efficiency and high-characteristic transformer, and relates to the technical field of transformers, the high-efficiency and high-characteristic transformer comprises a first magnetic core, a second magnetic core, a magnetic column, a second coil and a first coil, and a fixing mechanism used for fixing and cooling the second coil and the first coil is arranged between the first magnetic core and the second magnetic core. And a clamping mechanism for conveniently clamping and butting the first magnetic core and the second magnetic core is arranged on the second magnetic core. According to the transformer, the first coil and the second coil can be extruded and positioned through the fixing mechanism, the situation that the first coil and the second coil rotate and deviate in the assembling process is effectively avoided through friction force, and meanwhile the heat dissipation efficiency of the transformer can be further improved by increasing the heat dissipation area; the first magnetic core and the second magnetic core can be conveniently clamped and butted, and the first coil and the second coil are secondarily limited and fixed, so that the assembling efficiency of the transformer can be further improved.

Description

Technical Field

[0001] The invention relates to the technical field of transformers, in particular to a high-efficiency and high-performance transformer. Background Art

[0002] A transformer is a device that uses the principle of electromagnetic induction to change AC voltage. It is mainly composed of an iron core and a coil. Its main function is to change voltage, current and impedance to achieve the transmission, distribution and matching of electric energy. In order to avoid complicated production processes, many pins and high product heat generation, the existing transformers are produced through the assembly method of automatic wire cakes and the design of flat coil wires, which can effectively improve production efficiency and improve the heat dissipation efficiency of the coil cross section.

[0003] In the production process of existing transformers, it is usually necessary to sleeve the two coils on the magnetic column in an interlaced manner, and then limit and fix the two coils by docking the two magnetic cores, so as to achieve the initial assembly of the transformer. However, in this process, since the transformer mainly relies on manual assembly by humans, and there are no component assemblies for limiting the position on the magnetic core and the magnetic column, the two coils will frequently experience self-rotation deviation during the assembly process, resulting in poor assembly efficiency of the transformer. In order to further improve the assembly efficiency of the transformer, based on this, a high-efficiency and high-performance transformer is now provided, which can eliminate the disadvantages of the existing device. Summary of the invention

[0004] The object of the present invention is to provide a high-efficiency and high-performance transformer to solve the problems in the background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A high-efficiency and high-characteristic transformer comprises a first magnetic core, a second magnetic core is arranged on the lower surface of the first magnetic core, two magnetic columns are symmetrically arranged between the first magnetic core and the second magnetic core, the two magnetic columns are respectively located on the inner sides of the first magnetic core and the second magnetic core, the two magnetic columns are respectively fixedly connected to the first magnetic core and the second magnetic core, three second coils are vertically and equidistantly arranged on the outer sides of the two magnetic columns, the three second coils are fixedly connected by connecting wires, two first coils are symmetrically arranged between the first magnetic core and the second magnetic core, the two first coils are respectively located on the outer sides of the two magnetic columns, the two first coils are interlaced with the three second coils, the connecting wires are located on the outer sides of the first coils, and a fixing mechanism for fixing the second coils and the first coils and dissipating heat is arranged between the first magnetic core and the second magnetic core;

[0007] The second magnetic core is provided with a locking mechanism for conveniently locking and docking the first magnetic core and the second magnetic core.

[0008] On the basis of the above technical solution, the present invention also provides the following optional technical solution:

[0009] In an optional solution: the fixing mechanism includes: a first limit assembly arranged on the magnetic column;

[0010] The first limit assembly includes: a fixed cylinder arranged between the first magnetic core and the second magnetic core, the fixed cylinder is slidably sleeved on the outer walls of the two magnetic columns, the bottom end of the fixed cylinder is fixedly connected to a limit stop ring, the outer wall of the limit stop ring is in contact with the inner wall of the second magnetic core, the outer wall of the fixed cylinder is slidably sleeved with a limit pressure ring, the outer wall of the limit pressure ring is in contact with the inner wall of the first magnetic core, the second coil and the first coil are both slidably sleeved on the outer wall of the fixed cylinder, and the second coil and the first coil are both located between the limit pressure ring and the limit stop ring;

[0011] The limiting retaining ring is provided with a second limiting assembly;

[0012] A heat dissipation component is arranged on the second coil.

[0013] In an optional solution: the second limit assembly includes: a limit baffle fixedly connected to the outer wall of the limit baffle ring, the top of the limit baffle is fixedly connected to a fixed heat conducting plate, the upper surface of the fixed heat conducting plate is provided with a limit pressure plate, the limit pressure plate is located outside the limit pressure ring, and the limit pressure plate is fixedly connected to the limit pressure ring;

[0014] The limiting pressure plate is provided with a locking assembly.

[0015] In an optional solution: the locking assembly is a bolt arranged on the top of the limiting pressure plate, the bolt passes through the limiting pressure plate to the inside of the fixed heat conducting plate, and the bolt is threadedly connected to the fixed heat conducting plate.

[0016] In an optional solution: the heat dissipation assembly includes: a heat dissipation connection block fixedly connected to the outer wall of the second coil, the heat dissipation connection block is slidably sleeved on the outer wall of the fixed heat conductive plate, and two groups of heat dissipation plates are symmetrically fixedly connected to one end of the heat dissipation connection block away from the second coil, and the two groups of heat dissipation plates are respectively located on both sides of the fixed heat conductive plate.

[0017] In an optional solution: the engaging mechanism includes: a docking assembly arranged on the second magnetic core;

[0018] The docking assembly includes: two elastic clamps symmetrically fixedly connected to the top of the second magnetic core, the two elastic clamps both penetrate into the interior of the first magnetic core, and the first magnetic core and the two elastic clamps are connected at the positions where the two elastic clamps are connected, and the docking sleeve grooves that match the outer walls of the elastic clamps are formed;

[0019] The elastic card plate is provided with a clamping assembly;

[0020] A positioning component is arranged on the second magnetic core.

[0021] In an optional solution: the locking assembly includes: a positioning block fixedly connected to one side of the elastic card plate, the outer wall of the positioning block on the side away from the elastic card plate is inclined, the positioning block passes through the interior of the first magnetic core, and a positioning groove that matches the outer wall of the positioning block is provided at the connection position between the first magnetic core and the positioning block.

[0022] In an optional scheme: the positioning component includes: a plurality of limit blocks fixedly connected to the bottom end of the inner wall of the second magnetic core at equidistant intervals in the circumferential direction, the plurality of limit blocks are located on the outside of the magnetic column, the outer walls of the plurality of limit blocks are hemispherical, the plurality of limit blocks extend into the interior of the limit stop ring, and a positioning slot that matches the outer wall of the limit block is provided at the connection position between the limit stop ring and the limit block.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The present invention can squeeze and position the first coil and the second coil through a fixing mechanism, and effectively avoid the first coil and the second coil from rotating and deviating during the assembly process through friction, while further improving the heat dissipation efficiency of the transformer by increasing the heat dissipation area.

[0025] 2. The present invention can conveniently engage and dock the first magnetic core with the second magnetic core through the engaging mechanism, and perform secondary position limiting and fixing on the first coil and the second coil, thereby further improving the assembly efficiency of the transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the present invention.

[0027] Figure 2 It is a schematic diagram of the internal structure of the first magnetic core of the present invention.

[0028] Figure 3 It is a schematic diagram of the connection structure between the heat dissipation connection block and the second coil of the present invention.

[0029] Figure 4 This is a schematic diagram of the first coil structure of the present invention.

[0030] Figure 5 It is a schematic diagram of the connection structure between the limit stop ring and the limit clamping block of the present invention.

[0031] Figure 6 It is a schematic diagram of the explosion structure of the first magnetic core and the second magnetic core of the present invention.

[0032] Figure 7It is a schematic diagram of the connection structure between the limiting pressure plate and the fixed heat conducting plate of the present invention.

[0033] Notes on the figure markings: 1. first magnetic core; 201. heat dissipation connecting block; 202. heat dissipation plate; 203. bolt; 204. limit pressure plate; 205. limit pressure ring; 206. fixing tube; 207. fixed heat conductive plate; 208. limit baffle plate; 209. limit baffle ring; 301. positioning slot; 302. limit block; 303. docking slot; 304. positioning block; 305. elastic card; 4. first coil; 5. second magnetic core; 6. magnetic column; 7. connecting line; 8. second coil. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0035] In one embodiment, Figure 1-Figure 7 As shown, a high-efficiency and high-characteristic transformer comprises a first magnetic core 1, a second magnetic core 5 is arranged on the lower surface of the first magnetic core 1, two magnetic columns 6 are symmetrically arranged between the first magnetic core 1 and the second magnetic core 5, the two magnetic columns 6 are respectively located on the inner sides of the first magnetic core 1 and the second magnetic core 5, the two magnetic columns 6 are respectively fixedly connected to the first magnetic core 1 and the second magnetic core 5, three second coils 8 are vertically and equidistantly arranged on the outer sides of the two magnetic columns 6, the three second coils 8 are fixedly connected by connecting wires 7, two first coils 4 are symmetrically arranged between the first magnetic core 1 and the second magnetic core 5, the two first coils 4 are respectively located on the outer sides of the two magnetic columns 6, the two first coils 4 are interlaced with the three second coils 8, the connecting wires 7 are located on the outer sides of the first coils 4, and a fixing mechanism for fixing and dissipating the second coils 8 and the first coil 4 is arranged between the first magnetic core 1 and the second magnetic core 5;

[0036] The second magnetic core 5 is provided with a snap-fit ​​mechanism for convenient snap-fitting and docking of the first magnetic core 1 and the second magnetic core 5;

[0037] The fixing mechanism includes: a first limit assembly arranged on the magnetic column 6;

[0038] The first limiting assembly includes: a fixed cylinder 206 arranged between the first magnetic core 1 and the second magnetic core 5, the fixed cylinder 206 is slidably sleeved on the outer walls of the two magnetic columns 6, the bottom end of the fixed cylinder 206 is fixedly connected to a limiting retaining ring 209, the outer wall of the limiting retaining ring 209 is in contact with the inner wall of the second magnetic core 5, the outer wall of the fixed cylinder 206 is slidably sleeved with a limiting pressure ring 205, the outer wall of the limiting pressure ring 205 is in contact with the inner wall of the first magnetic core 1, the second coil 8 and the first coil 4 are both slidably sleeved on the outer wall of the fixed cylinder 206, and the second coil 8 and the first coil 4 are both located between the limiting pressure ring 205 and the limiting retaining ring 209;

[0039] The limiting retaining ring 209 is provided with a second limiting assembly;

[0040] A heat dissipation component is provided on the second coil 8;

[0041] In this embodiment, when in use, two first coils 4 and three second coils 8 are interlaced, and then the interlaced first coils 4 and second coils 8 are sequentially sleeved on the outer wall of the fixed cylinder 206. During this process, the second coil 8 can be limited in movement by the fixing mechanism, and then the limiting pressure ring 205 is pushed to sleeve the top outer wall of the fixed cylinder 206, and the upper surface of a second coil 8 is squeezed. At this time, the first coil 4 and the second coil 8 can be squeezed and positioned by the fixing mechanism, so as to effectively avoid the first coil 4 and the second coil 8 from self-rotation deviation during the assembly process through friction force;

[0042] Then, the limiting retaining ring 209 is placed above the second magnetic core 5. At this time, the outer wall of one magnetic column 6 is sleeved by the fixing cylinder 206. At the same time, the fixing cylinder 206 can be conveniently positioned by the engaging mechanism. Then, the first magnetic core 1 is placed above the limiting pressure ring 205. Then, the first magnetic core 1 is pushed to insert the other magnetic column 6 into the inside of the fixing cylinder 206 until the first magnetic core 1 contacts the upper surface of the second magnetic core 5. At this time, the other magnetic column 6 contacts the upper surface of the one magnetic column 6.

[0043] In this process, the first magnetic core 1 and the second magnetic core 5 can be conveniently engaged and docked by the engaging mechanism, and the first magnetic core 1 can squeeze the upper surface of the limit pressure ring 205 and the fixing cylinder 206 to limit and lock the fixing cylinder 206, thereby effectively avoiding the first coil 4 and the second coil 8 from self-rotation deviation during the subsequent processing, thereby further improving the assembly efficiency of the transformer, and the heat dissipation efficiency of the transformer can be further improved by the fixing mechanism;

[0044] In one embodiment, Figure 1-Figure 7 As shown, the second limiting assembly includes: a limiting baffle 208 fixedly connected to the outer wall of the limiting baffle ring 209, the top of the limiting baffle 208 is fixedly connected to the fixed heat conducting plate 207, the upper surface of the fixed heat conducting plate 207 is provided with a limiting pressure plate 204, the limiting pressure plate 204 is located on the outer side of the limiting pressure ring 205, and the limiting pressure plate 204 is fixedly connected to the limiting pressure ring 205;

[0045] A locking assembly is provided on the limiting pressure plate 204;

[0046] The locking assembly is a bolt 203 disposed at the top of the limiting pressure plate 204. The bolt 203 penetrates the limiting pressure plate 204 to the interior of the fixed heat conducting plate 207. The bolt 203 is threadedly connected to the fixed heat conducting plate 207.

[0047] The heat dissipation component includes: a heat dissipation connection block 201 fixedly connected to the outer wall of the second coil 8, the heat dissipation connection block 201 is slidably sleeved on the outer wall of the fixed heat conducting plate 207, and the heat dissipation connection block 201 is symmetrically fixedly connected to one end away from the second coil 8 with two groups of heat dissipation plates 202, and the two groups of heat dissipation plates 202 are respectively located on both sides of the fixed heat conducting plate 207. Through the cooperation of the second limiting component, the locking component and the heat dissipation component, the limiting pressure ring 205, the first coil 4 and the second coil 8 can be synchronously locked and fixed, so as to effectively avoid the first coil 4 and the second coil 8 from self-rotation deviation during the assembly process;

[0048] In one embodiment, Figure 1-Figure 6 As shown, the engaging mechanism includes: a docking assembly arranged on the second magnetic core 5;

[0049] The docking assembly includes: two elastic clamps 305 symmetrically fixedly connected to the top of the second magnetic core 5, the two elastic clamps 305 are both inserted into the interior of the first magnetic core 1, and the first magnetic core 1 and the two elastic clamps 305 are connected at the positions where the two elastic clamps 305 are connected, and the docking sleeve grooves 303 that match the outer walls of the elastic clamps 305 are formed;

[0050] The elastic card plate 305 is provided with a clamping assembly;

[0051] A positioning component is provided on the second magnetic core 5;

[0052] The clamping assembly includes: a positioning block 304 fixedly connected to one side of the elastic clamping plate 305, the outer wall of the positioning block 304 on one side away from the elastic clamping plate 305 is in an inclined shape, the positioning block 304 penetrates into the interior of the first magnetic core 1, and a positioning slot 301 that matches the outer wall of the positioning block 304 is provided at the connection position between the first magnetic core 1 and the positioning block 304. Through the mutual cooperation of the docking assembly and the clamping assembly, the first magnetic core 1 and the second magnetic core 5 can be conveniently docked;

[0053] In one embodiment, Figure 5-Figure 7 As shown, the positioning component includes: a plurality of limit blocks 302 fixedly connected to the bottom end of the inner wall of the second magnetic core 5 at equal intervals in the circumferential direction, the plurality of limit blocks 302 are all located on the outside of the magnetic column 6, the outer walls of the plurality of limit blocks 302 are all hemispherical, the plurality of limit blocks 302 all penetrate into the interior of the limit ring 209, and a positioning slot that matches the outer wall of the limit block 302 is provided at the connection position between the limit ring 209 and the limit block 302. The friction between the second magnetic core 5 and the limit ring 209 can be increased through the mutual cooperation between the limit block 302 and the positioning slot, thereby effectively avoiding the self-rotation offset of the first coil 4 and the second coil 8 during the subsequent processing.

[0054] The above embodiment discloses a high-efficiency and high-performance transformer, wherein, when in use, two first coils 4 and three second coils 8 are interlaced with each other, and then the interlaced first coils 4 and second coils 8 are sequentially sleeved on the outer wall of the fixed cylinder 206. In this process, the heat dissipation connection block 201 is driven by the second coils 8 to slide and sleeve on the outer wall of the fixed heat conducting plate 207, so that the second coils 8 can be moved and limited;

[0055] Then, the limiting pressure ring 205 is pushed to sleeve the top outer wall of the fixed cylinder 206, and the upper surface of a second coil 8 is squeezed. At this time, the limiting pressure plate 204 is driven by the limiting pressure ring 205 to contact the upper surface of the fixed heat conducting plate 207, and then the bolt 203 is rotated by a tool to penetrate the limiting pressure plate 204 and be threadedly connected with the fixed heat conducting plate 207, so that the first coil 4 and the second coil 8 can be squeezed and positioned, so as to effectively avoid the first coil 4 and the second coil 8 from self-rotation deviation during the assembly process through friction force;

[0056] Then, the limiting retaining ring 209 is placed above the second magnetic core 5. At this time, the fixing tube 206 can be sleeved on the outer wall of one magnetic column 6 through the limiting retaining ring 209. When the limiting retaining ring 209 contacts the outer walls of the plurality of limiting blocks 302, the limiting retaining ring 209 is rotated to drive the positioning slot to move above the limiting block 302. Then, the limiting retaining ring 209 is pushed to sleeve the outer wall of the limiting block 302 through the positioning slot, so that the limiting retaining ring 209 can be conveniently positioned. Then, the first magnetic core 1 is placed above the limiting pressure ring 205, and then the first magnetic core 1 is pushed to insert the other magnetic column 6 into the inside of the fixing tube 206 until the first magnetic core 1 contacts the upper surface of the second magnetic core 5, and at this time, the other magnetic column 6 contacts the upper surface of one magnetic column 6.

[0057] During this process, the first magnetic core 1 squeezes the inclined outer wall of the positioning block 304 through the inner wall of the docking sleeve groove 303. At this time, the elastic card plate 305 is slightly deformed by the positioning block 304 under the squeezing of the external force. When the first magnetic core 1 contacts the upper surface of the second magnetic core 5, the elastic card plate 305 recovers through its own elastic rebound. At the same time, the positioning block 304 is inserted into the inner cavity of the positioning slot 301 under the push of the elastic card plate 305, so that the first magnetic core 1 and the second magnetic core 5 can be conveniently engaged and docked. By squeezing the upper surfaces of the limiting pressure ring 205 and the fixing cylinder 206 by the first magnetic core 1, the fixing cylinder 206 can be limited and locked, so as to effectively avoid the first coil 4 and the second coil 8 from self-rotation deviation in the subsequent processing process, thereby further improving the assembly efficiency of the transformer;

[0058] When power is supplied to the transformer, the heat on the second coil 8 can be conducted to the heat sink 202 and the fixed heat conducting plate 207 through the heat dissipation connection block 201, thereby effectively increasing the heat dissipation area of ​​the transformer and further improving the heat dissipation efficiency of the transformer.

[0059] The above is only a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A high-efficiency and high-characteristic transformer, comprising a first magnetic core (1), a second magnetic core (5) being arranged on the lower surface of the first magnetic core (1), two magnetic columns (6) being symmetrically arranged between the first magnetic core (1) and the second magnetic core (5), the two magnetic columns (6) being respectively located on the inner sides of the first magnetic core (1) and the second magnetic core (5), the two magnetic columns (6) being respectively fixedly connected to the first magnetic core (1) and the second magnetic core (5), three second coils (8) being vertically equidistantly arranged on the outer sides of the two magnetic columns (6), the three second coils (8) being fixedly connected to each other by connecting wires (7), two first coils (4) being symmetrically arranged between the first magnetic core (1) and the second magnetic core (5), the two first coils (4) being respectively located on the outer sides of the two magnetic columns (6), the two first coils (4) and the three second coils (8) being interlaced with each other, the connecting wires (7) being located on the outer sides of the first coils (4), characterized in that: A fixing mechanism for fixing the second coil (8) and the first coil (4) and dissipating heat is provided between the first magnetic core (1) and the second magnetic core (5); The second magnetic core (5) is provided with a snap-fit ​​mechanism for convenient snap-fitting and docking of the first magnetic core (1) and the second magnetic core (5).

2. A high efficiency and high characteristic transformer according to claim 1, characterized in that: The fixing mechanism comprises: a first limiting component arranged on the magnetic column (6); The first limiting component comprises: a fixed cylinder (206) arranged between the first magnetic core (1) and the second magnetic core (5), the fixed cylinder (206) being slidably sleeved on the outer walls of the two magnetic columns (6), the bottom end of the fixed cylinder (206) being fixedly connected to a limiting retaining ring (209), the outer wall of the limiting retaining ring (209) being in contact with the inner wall of the second magnetic core (5), the outer wall of the fixed cylinder (206) being slidably sleeved on a limiting pressure ring (205), the outer wall of the limiting pressure ring (205) being in contact with the inner wall of the first magnetic core (1), the second coil (8) and the first coil (4) being both slidably sleeved on the outer wall of the fixed cylinder (206), and the second coil (8) and the first coil (4) being both located between the limiting pressure ring (205) and the limiting retaining ring (209); The limiting retaining ring (209) is provided with a second limiting assembly; A heat dissipation component is arranged on the second coil (8).

3. A high efficiency and high characteristic transformer according to claim 2, characterized in that: The second limiting assembly comprises: a limiting baffle (208) fixedly connected to the outer wall of the limiting baffle ring (209), the top of the limiting baffle (208) being fixedly connected to a fixed heat conducting plate (207), the upper surface of the fixed heat conducting plate (207) being provided with a limiting pressure plate (204), the limiting pressure plate (204) being located outside the limiting pressure ring (205), and the limiting pressure plate (204) being fixedly connected to the limiting pressure ring (205); The limiting pressure plate (204) is provided with a locking assembly.

4. A high efficiency and high characteristic transformer according to claim 3, characterized in that: The locking assembly is a bolt (203) arranged at the top of the limiting pressure plate (204), the bolt (203) penetrates the limiting pressure plate (204) to the inside of the fixed heat conducting plate (207), and the bolt (203) is threadedly connected to the fixed heat conducting plate (207).

5. A high efficiency and high characteristic transformer according to claim 2, characterized in that: The heat dissipation assembly comprises: a heat dissipation connection block (201) fixedly connected to the outer wall of the second coil (8), the heat dissipation connection block (201) being slidably sleeved on the outer wall of a fixed heat conducting plate (207), and two groups of heat dissipation plates (202) being symmetrically fixedly connected to one end of the heat dissipation connection block (201) away from the second coil (8), and the two groups of heat dissipation plates (202) are respectively located on two sides of the fixed heat conducting plate (207).

6. The high-efficiency and high-performance transformer according to claim 1, characterized in that: The engaging mechanism comprises: a docking assembly arranged on the second magnetic core (5); The docking assembly comprises: two elastic clamping plates (305) symmetrically fixedly connected to the top of the second magnetic core (5), the two elastic clamping plates (305) both penetrate into the interior of the first magnetic core (1), and a docking sleeve groove (303) that matches the outer wall of the elastic clamping plate (305) is provided at the connection position between the first magnetic core (1) and the two elastic clamping plates (305); The elastic clamping plate (305) is provided with a clamping assembly; A positioning component is provided on the second magnetic core (5).

7. A high efficiency and high characteristic transformer according to claim 6, characterized in that: The clamping assembly comprises: a positioning block (304) fixedly connected to one side of an elastic clamping plate (305); an outer wall of the positioning block (304) on a side away from the elastic clamping plate (305) is in an inclined shape; the positioning block (304) penetrates into the interior of the first magnetic core (1); and a positioning slot (301) that matches the outer wall of the positioning block (304) is provided at a position where the first magnetic core (1) and the positioning block (304) meet.

8. The high-efficiency and high-performance transformer according to claim 6, characterized in that: The positioning assembly comprises: a plurality of limit blocks (302) fixedly connected to the bottom end of the inner wall of the second magnetic core (5) at equal intervals in the circumferential direction; the plurality of limit blocks (302) are all located outside the magnetic column (6); the outer walls of the plurality of limit blocks (302) are all hemispherical; the plurality of limit blocks (302) are all penetrated into the interior of the limit stop ring (209); and a positioning slot that matches the outer wall of the limit block (302) is provided at the position where the limit stop ring (209) and the limit block (302) meet.

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