Cascade water chilling unit

Abstract

The utility model is suitable for the technical field of water chilling units, and provides a cascade water chilling unit which comprises an assembly body, a condensation mechanism is arranged in the assembly body, the condensation mechanism is provided with a cooling pipe and a condensation pipe, and a plurality of fixing mechanisms are arranged on the side wall of the assembly body at equal intervals along the height of the assembly body. Each fixing mechanism is provided with a horizontally-arranged sliding rod and a plurality of supporting assemblies connected to the sliding rod in a sliding mode, the supporting assemblies are arranged on the outer sides of the cooling pipes and the condensation pipes in a sleeving mode, and the cooling pipes and the condensation pipes in the device are arranged in lower arc grooves formed in the top wall of the bottom supporting plate. After the cooling pipe and the condensation pipe are placed, the top pressing plate is arranged on the bottom supporting plate in a pressing mode, meanwhile, the cooling pipe and the condensation pipe are located in the circular installation groove defined by the upper arc groove and the lower arc groove, supporting of the cooling pipe and the condensation pipe is achieved through the installation groove, and meanwhile the cooling pipe and the condensation pipe are protected in an all-around mode. And separation from the supporting assembly is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of water chillers, and in particular relates to a cascade water chiller. Background Art

[0002] Chillers are divided into two types in the industry: air-cooled chillers and water-cooled chillers. Chillers are divided into low-temperature chillers and normal-temperature chillers in terms of temperature control. When the chiller refrigerant circulates in the system, the liquid refrigerant in the evaporator absorbs heat from the water and begins to evaporate. Eventually, a certain temperature difference is formed between the refrigerant and the water. The liquid refrigerant is completely evaporated into a gaseous state and then sucked into and compressed by the compressor. The gaseous refrigerant absorbs heat through the condenser and condenses into liquid. After being throttled by the thermal expansion valve, it becomes a low-temperature and low-pressure refrigerant and enters the evaporator, completing the refrigerant circulation process.

[0003] The Chinese utility model patent with announcement number CN212842308U is a cascade chiller, including a group body, a heat dissipation network is installed above the outer surface of the group body, a water inlet is opened below the outer surface of the group body, and one side of the group body is connected to a circulation cavity through a circulation pipe. The utility model generates low-temperature steam through the coolant inside the cooling box. The steam enters the interior of the compressor through a connecting pipe, is compressed into high-temperature, high-pressure gas by the compressor, and then enters the condenser for cooling. The cooled gas enters the circulation cavity, and the circulation cavity blows cold air into the cooling box through the circulation pipe to cool the coolant in the cooling box. The refrigeration expansion valve discharges the water in the cooling box into the delivery pipe. The micro pump transfers the water in the refrigerator to the evaporative condenser through the connecting pipe. The evaporative condenser performs a second stage of cooling treatment on the coolant through the cooling pipe, forming a cycle to cool the coolant and improve the cooling effect.

[0004] However, the above device has the following technical problems when actually used:

[0005] 1. In the above device, a positioning frame is provided on the side wall of the assembly, and a pair of positioning grooves are provided on the outer side wall of the positioning frame, and the cooling pipe and the condensing pipe are clipped into the positioning groove to fix them. However, in actual operation, the positioning groove is provided on the side wall of the positioning frame, resulting in that the cooling pipe and the condensing pipe can only be partially embedded in the positioning groove by clipping from the side during assembly. At the same time, the bottom of the cooling pipe and the condensing pipe lacks support. When the assembly shakes, the cooling pipe and the condensing pipe may fall off from the positioning groove due to lack of support and poor stability. In addition, the positioning groove is fixed in size and cannot meet the needs of fixed assembly of cooling pipes and condensing pipes of different sizes, affecting actual use.

[0006] Second, the length of the positioning frame in the above device is fixed, and the cooling tube and the condensing tube are both S-shaped tubes, which means that the cooling tube and the condensing tube must be filled with positioning grooves before they can be bent. This method limits the length of the cooling tube and the condensing tube, causing trouble in actual use. Utility Model Content

[0007] The present invention provides a cascade chiller, which aims to solve the problem mentioned in the above-mentioned background technology that the cooling pipe and the condensing pipe in the above-mentioned device can only be partially embedded in the positioning groove by means of side clipping during assembly, and the bottoms of the cooling pipe and the condensing pipe lack support. When the assembly shakes, the cooling pipe and the condensing pipe may fall off from the positioning groove due to lack of support and poor stability, and the limitation of the size of the positioning groove cannot meet the requirements of assembling cooling pipes and condensing pipes of different sizes. At the same time, the length of the positioning groove of the above-mentioned device is fixed, so the length of the cooling pipe and the condensing pipe is limited, which will cause trouble during actual assembly.

[0008] The present invention is implemented as follows: a cascade chiller comprises: an assembly body, in which a condensing mechanism is arranged, wherein the condensing mechanism has a cooling pipe and a condensing pipe, and a plurality of fixing mechanisms are arranged on the side wall of the assembly body at equal intervals along its height, each of the fixing mechanisms comprises: a horizontally arranged sliding rod, and a plurality of supporting components slidably connected to the sliding rod, the supporting components are sleeved on the outside of the cooling pipe and the condensing pipe, and the supporting components and the cooling pipe and the condensing pipe are detachably connected; in this scheme, the condensing mechanism in this device includes a cooling pipe and a condensing pipe, and the condensing pipe and the cooling pipe are assembled inside the assembly body. In order to ensure the stability of the condensing pipe and the cooling pipe during the assembly process, a fixing mechanism needs to be arranged on the side wall of the assembly body to ensure the stable assembly of the cooling pipe and the condensing pipe.

[0009] Among them, the cooling pipe and the condensing pipe in this device are arranged in the lower arc groove opened on the top wall of the bottom support plate. After the cooling pipe and the condensing pipe are placed, the top pressure plate is pressed onto the bottom support plate, and the cooling pipe and the condensing pipe are placed in the circular installation groove formed between the upper arc groove and the lower arc groove. The cooling pipe and the condensing pipe are supported by the installation groove, and are protected in all directions to prevent them from detaching from the supporting assembly. In addition, by setting the installation groove, the placement of cooling pipes and condensing pipes of different sizes can be met, thereby improving the applicability of the device.

[0010] In addition, the support assembly in this device can be slidably arranged on the slide rod, so the position of the support assembly on the slide rod can be adjusted according to the actual length of the cooling pipe and the condenser pipe and the requirements of the bending part, so that it can be adjusted according to actual usage requirements, thereby ensuring the stability of the cooling pipe and the condenser pipe during assembly.

[0011] Preferably, two support seats are symmetrically fixedly installed on the side walls of the group body, and the sliding rod is horizontally fixedly connected between the ends of the two support seats away from the side walls of the group body, and the supporting assembly includes: a sliding sleeve which is sleeved on the outside of the sliding rod and slides with it, a bottom support plate is fixedly installed on the side wall of the sliding sleeve away from the sliding rod, and a top pressure plate is provided above the bottom support plate in parallel, the top pressure plate and the bottom support plate are detachably connected, wherein a lower arc groove is provided on the top wall of the bottom support plate, and an upper arc groove is provided on the bottom wall of the top pressure plate corresponding to the lower arc groove, the cooling pipe and the condenser pipe are provided Placed in the installation groove formed by the upper arc groove and the lower arc groove; in this scheme, at least one sliding sleeve is slidably connected to the sliding rod, and a bottom support plate is horizontally fixed to the side wall of each sliding sleeve, and a lower arc groove is opened in the middle position of the top wall of the bottom support plate, which can conveniently support the cooling pipe and the condenser pipe. At the same time, a top pressure plate is also provided above the bottom support plate, and the top pressure plate is longitudinally movably arranged above the bottom support plate through a reset assembly. The middle position of the bottom wall of the top pressure plate corresponds to the lower arc groove and is opened in the upper arc groove. The upper arc groove is used to clamp the cooling pipe and the condenser pipe, thereby cooperating with the lower arc groove to achieve fixed assembly of the cooling pipe and the condenser pipe.

[0012] The cam is fixedly mounted on the bottom wall of the sliding sleeve, and the cam is fixedly mounted on the top wall of the sliding sleeve, wherein the cam is fixedly mounted on the bottom wall of the sliding sleeve, and the cam is fixedly mounted on the top wall of the sliding sleeve, thereby increasing the friction between the sliding sleeve and the sliding sleeve and avoiding unnecessary displacement of the sliding sleeve during use.

[0013] Preferably, a reset assembly is also provided between the bottom support plate and the top pressure plate, which comprises: a positioning rod is erected and fixedly connected to the bottom wall of the top pressure plate end portion of the upper arc groove close to the sliding sleeve, and a through hole is opened on the bottom support plate corresponding to the positioning rod for its penetration, the positioning rod penetrates to the outer wall below the bottom support plate and a limiting block is fixedly installed, and a second spring is sleeved on the outer side of the positioning rod between the top wall of the limiting block and the bottom wall of the bottom support plate; in this scheme, when the top pressure plate is pulled in the direction away from the bottom support plate, the positioning rod will move up synchronously with the top pressure plate, and the limiting block will gradually approach the bottom wall of the bottom support plate. At this time, the limiting block will squeeze the second spring, and when the top pressure plate is released, the limiting block pulls the positioning rod downward driven by the rebound kinetic energy of the second spring, and the positioning rod drives the top pressure plate close to the bottom support plate.

[0014] Preferably, a positioning assembly is further provided between the bottom support plate and the top pressure plate, which comprises: a positioning block is integrally formed on the bottom wall of the end portion of the upper arc groove away from the sliding sleeve, and a positioning groove is also provided on the corresponding top wall of the bottom support plate, wherein, when the top pressure plate is in contact with the bottom support plate, the positioning block is accommodated in the positioning groove; in this scheme, in order to ensure that the top pressure plate and the bottom support plate are stably fitted without dislocation or offset, when the top pressure plate is in contact with the bottom support plate, the positioning block on the bottom wall of the top pressure plate will be inserted into the positioning groove provided on the top wall of the bottom support plate, and the top pressure plate and the bottom support plate can be stably fixed by the mutual cooperation of the positioning block and the positioning groove.

[0015] Preferably, a positioning hole is provided on the side wall of the positioning block, and a locking hole corresponding to the positioning hole is also provided on the side wall of the positioning groove. A locking pin is detachably connected to the positioning hole, and its end portion is inserted into the locking hole. In this solution, in order to prevent the positioning block from detaching from the positioning groove, when the positioning block is inserted into the positioning groove, the locking pin is inserted from the positioning hole, and its exposed end is inserted into the locking hole. The locking pin ensures that the positioning block will not detach from the positioning groove.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: a cascade chiller unit of the present invention:

[0017] 1. The cooling pipe and the condensing pipe in this device are arranged in the lower arc groove opened on the top wall of the bottom support plate. After the cooling pipe and the condensing pipe are placed, the top pressure plate is pressed onto the bottom support plate, and the cooling pipe and the condensing pipe are placed in the circular mounting groove formed between the upper arc groove and the lower arc groove. The mounting groove supports the cooling pipe and the condensing pipe, and at the same time provides all-round protection to prevent them from detaching from the supporting assembly. In addition, by providing the mounting groove, the placement of cooling pipes and condensing pipes of different sizes can be met, thereby improving the scope of application of the device.

[0018] 2. The support assembly in this device can be slidably arranged on the slide rod, so the position of the support assembly on the slide rod can be adjusted according to the actual length of the cooling pipe and the condensing pipe and the requirements of the bending part, so as to be adjusted according to actual usage requirements, thereby ensuring the stability of the cooling pipe and the condensing pipe during assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a front cross-sectional view of the utility model;

[0020] Figure 2 It is a top view of the fixing mechanism in the present utility model;

[0021] Figure 3 It is a side view of the fixing mechanism in the present utility model;

[0022] Figure 4 For this utility model Figure 3 A magnified view of the structure at center A;

[0023] Figure 5 A schematic diagram of a positioning assembly of the present utility model;

[0024] In the picture:

[0025] 1. Group;

[0026] 2. Condensation mechanism; 21. Cooling pipe; 22. Condensing pipe; 23. Water inlet pipe; 24. Cooling box; 25. Compressor; 26. Circulation box; 27. Return pipe; 28. Delivery pipe; 281. Control valve; 282. Refrigerator; 283. Pump body; 29. ​​Condenser;

[0027] 3. Fixing mechanism; 31. Slide rod; 311. Support seat; 32. Support assembly; 321. Slide sleeve; 322. Bottom support plate; 323. Top pressure plate; 324. Lower arc groove; 325. Upper arc groove; 33. Limiting assembly; 331. Movable rod; 332. Abutment plate; 333. Handle; 334. First spring; 34. Reset assembly; 341. Positioning rod; 342. Limiting block; 343. Second spring; 35. Positioning assembly; 351. Positioning block; 352. Positioning groove; 353. Positioning hole; 354. Locking hole; 355. Locking pin. DETAILED DESCRIPTION

[0028] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0029] The components of the embodiments of the present invention generally described and shown in the drawings herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention.

[0030] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

[0031] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0033] See also Figure 1-5 The utility model provides a technical solution: a cascade chiller, comprising: a group body 1, in which a condensing mechanism 2 is arranged, wherein the condensing mechanism 2 has a cooling pipe 21 and a condensing pipe 22, and a plurality of fixing mechanisms 3 are also arranged on the side wall of the group body 1 at equal intervals along its height, each fixing mechanism 3 has: a horizontally arranged sliding rod 31, and a plurality of supporting components 32 slidably connected to the sliding rod 31, the supporting component 32 is sleeved on the outside of the cooling pipe 21 and the condensing pipe 22, and the supporting component 32 and the cooling pipe 21 and the condensing pipe 22 are detachably connected.

[0034] Specifically, the condensing mechanism 2 in this device adopts the condensing component proposed in the Chinese utility model patent publication number CN212842308U (a cascade chiller) mentioned in the above background technology. According to the above reference document, the condensing mechanism 2 in this device also includes: an inlet pipe 23, a cooling box 24, a compressor 25, a circulation box 26, a return pipe 27, a delivery pipe 28 (on which a control valve 281, a refrigerator 282, and a pump body 283 are installed), and a condenser 29;

[0035] The user first lets the coolant enter the cooling box 24 from the water inlet pipe 23. The coolant in the cooling box 24 generates low-temperature steam. The low-temperature steam enters the compressor 25, where it is compressed into high-temperature, high-pressure gas. The gas then enters the condenser 22 for cooling. The cooled gas enters the circulation box 26 and is blown into the cooling box 24 through the return pipe 27, cooling the coolant in the cooling box 24 and performing the first stage of cooling.

[0036] Then the control valve 281 is opened, and the control valve 281 discharges the water in the cooling box 24 into the delivery pipe 28. The refrigerator 282 cools the coolant in the delivery pipe 28. Then the pump body 283 is turned on, and the pump body 283 transfers the water in the refrigerator 282 to the condenser 29 through the delivery pipe 28. The condenser 29 performs a second stage of cooling treatment on the coolant through the cooling pipe 21, forming a cycle to cool the coolant.

[0037] The above steps are all prior art and will not be described in detail in this solution. The actual problem to be solved by the present invention is: how to ensure the stable assembly of the cooling tube 21 and the condensing tube 22 in the assembly body 1.

[0038] The cam 322 is fixedly mounted on the top of the support frame 321, and the cam 323 is fixedly mounted on the support frame 322 to prevent the cam from sliding out of the support frame 321. The cam 323 is fixedly mounted on the top of the support frame 321, and the cam 323 is fixedly mounted on the top of the support frame 322.

[0039] Furthermore, the sliding sleeve 321 is provided with a limiting assembly 33 that is movably connected to the sliding rod 31, which comprises: a movable rod 331 slidably connected to the bottom wall of the sliding sleeve 321, the movable rod 331 is arranged upright, and a support plate 332 is fixedly installed on the end extending toward the sliding rod 31 on one side, and a handle 333 is fixedly installed on the end on the other side, and a first spring 334 is also sleeved on the outer side of the movable rod 331 between the bottom wall of the support plate 332 and the inner bottom wall of the sliding sleeve 321.

[0040] Furthermore, a reset assembly 34 is provided between the bottom support plate 322 and the top pressure plate 323, which comprises: a positioning rod 341 is erected and fixed on the bottom wall of the end of the top pressure plate 323 on the side of the upper arc groove 325 close to the sliding sleeve 321, and a through hole is opened on the bottom support plate 322 corresponding to the positioning rod 341 for its passage, the positioning rod 341 passes through the outer wall below the bottom support plate 322 and a limiting block 342 is fixedly installed, and a second spring 343 is sleeved on the outer side of the positioning rod 341 between the top wall of the limiting block 342 and the bottom wall of the bottom support plate 322.

[0041] Furthermore, a positioning assembly 35 is provided between the bottom support plate 322 and the top pressure plate 323, which comprises: a positioning block 351 is integrally formed on the bottom wall of the end of the upper arc groove 325 away from the sliding sleeve 321, and a positioning groove 352 is also provided on the corresponding top wall of the bottom support plate 322, wherein when the top pressure plate 323 is in contact with the bottom support plate 322, the positioning block 351 is accommodated in the positioning groove 352.

[0042] Specifically, the positioning block 351 can be a rectangular block, a trapezoidal block or a wedge-shaped block, and similarly, the positioning groove 352 can be a matching rectangular groove, a trapezoidal groove or a wedge-shaped groove.

[0043] Furthermore, a positioning hole 353 is provided on the side wall of the positioning block 351, and a locking hole 354 corresponding to the positioning hole 353 is also provided on the side wall of the positioning groove 352. A locking pin 355 is detachably connected to the positioning hole 353, and its end portion is inserted into the locking hole 354.

[0044] Specifically, in order to better ensure that the locking pin 355 will not fall out of the positioning hole 353, a threaded section is provided on the end of the locking pin 355 close to the positioning groove 352, and an internal thread is provided on the inner cavity of the locking hole 354. After the locking pin 355 passes through the positioning hole 353, the end with the threaded section is inserted into the locking hole 354. The locking pin 355 is rotated so that the threaded section and the internal thread are screwed together, thereby fixing the positioning block 351 in the positioning groove 352.

[0045] The working principle and use process of this utility model:

[0046] When assembling the cooling tube 21 and the condenser tube 22, the movable rod 331 is pulled away from the sliding rod 31, so that the support plate 332 and the bottom wall of the sliding rod 31 are separated. At this time, the first spring 334 is compressed. Then, after the sliding sleeve 321 is slid to the specified position, the movable rod 331 is released. Driven by the rebound of the first spring 334, the support plate 332 is pressed against the bottom wall of the sliding rod 31, thereby limiting the sliding sleeve 321.

[0047] Pull the top pressure plate 323 away from the bottom support plate 322, and place the cooling pipe 21 and the condenser pipe 22 in the installation groove formed by the lower arc groove 324 and the upper arc groove 325. Then release the top pressure plate 323. Driven by the rebound of the second spring 343, the positioning rod 341 moves downward and pulls the top pressure plate 323 to press on the bottom support plate 322 to fix the cooling pipe 21 and the condenser pipe 22 after assembly.

[0048] When the top pressure plate 323 is pressed onto the bottom support plate 322, the positioning block 351 is inserted into the positioning groove 352, and then the locking pin 355 is inserted along the positioning hole 353, and part of its end is inserted into the locking hole 354, ensuring that the positioning block 351 is fixed in the positioning groove 352, while preventing the top pressure plate 323 and the bottom support plate 322 from detaching.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A cascade chiller, characterized in that: include: An assembly (1) having a condensing mechanism (2) disposed therein; Wherein, the condensing mechanism (2) comprises a cooling pipe (21) and a condensing pipe (22); A plurality of fixing mechanisms (3) are also provided on the side wall of the assembly (1) at equal intervals along its height, and each of the fixing mechanisms (3) has: A horizontally arranged sliding rod (31) and a plurality of supporting assemblies (32) slidably connected to the sliding rod (31), wherein the supporting assemblies (32) are sleeved on the outside of the cooling pipe (21) and the condensing pipe (22), and the supporting assemblies (32) and the cooling pipe (21) and the condensing pipe (22) are detachably connected.

2. The cascade chiller according to claim 1, characterized in that: Two support seats (311) are symmetrically fixedly installed on the side wall of the group (1), and the sliding rod (31) is horizontally fixedly connected between the ends of the two support seats (311) away from the side wall of the group (1); The support assembly (32) comprises: A sliding sleeve (321) is sleeved on the outside of the sliding rod (31) and slidably matched with the sliding rod (31); a bottom support plate (322) is fixedly installed on the side wall of the sliding sleeve (321) away from the sliding rod (31); and a top pressure plate (323) is provided above the bottom support plate (322) in parallel; the top pressure plate (323) and the bottom support plate (322) are detachably connected; Wherein, a lower arc groove (324) is provided on the top wall of the bottom support plate (322), and an upper arc groove (325) is provided on the bottom wall of the top pressure plate (323) corresponding to the lower arc groove (324); The cooling pipe (21) and the condensing pipe (22) are arranged in a mounting groove formed by the upper arc groove (325) and the lower arc groove (324).

3. The cascade chiller according to claim 2, characterized in that: The sliding sleeve (321) is also provided with a limiting assembly (33) movably connected to the sliding rod (31), which has: A movable rod (331) is slidably connected to the bottom wall of the sliding sleeve (321), and the movable rod (331) is vertically arranged, and a stop plate (332) is fixedly installed on the end portion extending toward the sliding rod (31) on one side, and a handle (333) is fixedly installed on the end portion on the other side; A first spring (334) is sleeved on the outer side of the movable rod (331) between the bottom wall of the abutment plate (332) and the inner bottom wall of the sliding sleeve (321).

4. The cascade chiller according to claim 2, characterized in that: A reset assembly (34) is further provided between the bottom support plate (322) and the top pressure plate (323), and comprises: A positioning rod (341) is fixedly connected to the bottom wall of the end of the top pressure plate (323) on the side of the upper arc groove (325) close to the sliding sleeve (321), and a through hole corresponding to the positioning rod (341) is opened on the bottom support plate (322) for the positioning rod (341) to pass through. The positioning rod (341) passes through the outer wall below the bottom support plate (322) to fix a limiting block (342), and a second spring (343) is sleeved on the outer side of the positioning rod (341) between the top wall of the limiting block (342) and the bottom wall of the bottom support plate (322).

5. The cascade chiller according to claim 2, characterized in that: A positioning assembly (35) is further provided between the bottom support plate (322) and the top pressure plate (323), and comprises: A positioning block (351) is integrally formed on the bottom wall of the end portion of the upper arc groove (325) away from the sliding sleeve (321), and a positioning groove (352) is also provided on the corresponding top wall of the bottom support plate (322); When the top pressure plate (323) is in contact with the bottom support plate (322), the positioning block (351) is accommodated in the positioning groove (352).

6. The cascade chiller according to claim 5, characterized in that: A positioning hole (353) is provided on the side wall of the positioning block (351), and a locking hole (354) corresponding to the positioning hole (353) is also provided on the side wall of the positioning groove (352); A locking pin (355) is detachably connected to the positioning hole (353), and an end portion of the locking pin (355) is inserted into the locking hole (354).

Images