CN218956639U

CN218956639U - High-temperature reverse bias voltage testing machine capable of rapidly reducing temperature

Info

Publication number: CN218956639U
Application number: CN202223041923.0U
Authority: CN
Inventors: 朱永兵
Original assignee: Tianjin Ruixin Electronics Co ltd
Current assignee: Tianjin Ruixin Electronics Co ltd
Priority date: 2022-11-16
Filing date: 2022-11-16
Publication date: 2023-05-02
Anticipated expiration: 2032-11-16

Abstract

The utility model provides a high-temperature reverse bias voltage testing machine capable of rapidly reducing temperature, and belongs to the technical field of detection equipment. The rapid cooling high-temperature reverse bias testing machine comprises a working assembly and a dust removal assembly. Work subassembly includes supporting part, radiating part, cooling part and sealing part, the radiating part sets up the inside of supporting part, cooling part with sealing part all sets up on the supporting part, during the use, at the in-process that a plurality of closing plates upwards or downwardly moved for the brush hair can clear up the dust on two dust guard, can prevent dust jam dust guard, thereby can ensure the radiating efficiency to the inside of test machine body, the dust after the clearance drops the inside collection of collecting box, when the dust with the collecting box inside is cleared up, the accessible pull ring is to the front side with the collecting box pull out, then can clear up the dust of its inside, the efficiency to the dust clearance has been promoted, the effectual amount of labour that reduces the operator.

Description

High-temperature reverse bias voltage testing machine capable of rapidly reducing temperature

Technical Field

The utility model relates to the field of detection equipment, in particular to a high-temperature reverse bias voltage tester capable of quickly reducing temperature.

Background

Along with the continuous improvement of living standard of people, the development of production technology is better and better, the utilization of time of people is more and more severe, in life, the requirements of people on equipment are higher and higher, the working efficiency of the equipment is expected to be improved by innovating the equipment, the working time is shortened, the service efficiency is improved, the maximum value is brought into play, a high-temperature reverse bias tester is used for placing a detected diode or other elements such as VD or MOS in a high-temperature test box, the temperature in the high-temperature test box reaches a set value, a certain reverse direct current voltage is applied to the detected element, the reliability of each element is tested, and parameters such as high-temperature leakage current and voltage are detected.

Through retrieving, chinese patent No. CN202122077688.1 provides a high temperature reverse bias test machine convenient to rapid cooling, relates to the check out test set field, including test machine body and cooling mechanism, the top surface rigid coupling of test machine body has the mounting panel, and both sides are equipped with multiunit through-hole, and inside a plurality of baffles of being equipped with, the rigid coupling has the cylinder on the mounting panel and the output of cylinder is equipped with the telescopic shaft, and the outside of through-hole is equipped with corresponding closing plate, and cooling mechanism includes water-cooling tank and radiator fan, and the water-cooling tank side is equipped with the raceway. Can blow out the inside heat of tester body from the through-hole through the heat dissipation fan, the water cooling tank can make the inside of baffle be full of cooling water when cooling the tester body, on the one hand, can dispel the heat fast to the inside heat of tester body like this, on the other hand, the cooling water in the baffle also can prevent that the staff from being scalded when dismantling the tested component.

However, the above scheme still has a defect that dust can enter the tester body through the through hole in the process of radiating the tester body, so that the tester body can be polluted, and when the tested element is tested, an operator also needs to clean the tester body so as to test the tested element next time, thereby improving the labor capacity of the operator.

Disclosure of Invention

In order to overcome the defects, the utility model provides a high-temperature reverse bias tester capable of quickly reducing temperature, which aims to solve the problem that dust enters the tester body through a through hole in the process of radiating the tester body.

The utility model is realized in the following way:

the utility model provides a high-temperature reverse bias testing machine capable of rapidly reducing temperature, which comprises a working assembly and a dust removal assembly.

The working assembly comprises a supporting part, a heat dissipation part, a cooling part and a sealing part, wherein the heat dissipation part is arranged in the supporting part, and the cooling part and the sealing part are both arranged on the supporting part;

the dust removal assembly comprises a cleaning part and a collecting part, wherein the cleaning part is arranged on the sealing part, and the collecting part is arranged below the cleaning part.

In one embodiment of the utility model, the supporting part comprises a tester body, a protective door, a transparent heat-insulating window and a controller, wherein the protective door is rotatably arranged at the position, close to the upper part, of the front side of the tester body, the transparent heat-insulating window is arranged on the protective door, and the controller is arranged at the position, close to the lower part, of the front side of the tester body.

In one embodiment of the utility model, the supporting part further comprises universal wheels, and the universal wheels are arranged below the tester body near four corners.

In an embodiment of the utility model, the supporting portion further includes a partition board, a plurality of partition boards are disposed in the testing machine body, a plurality of mounting grooves are disposed on the left and right sides of the testing machine body, the left and right sides of the partition boards are slidably disposed in the testing machine body through the adjacent mounting grooves, the partition boards are hollow, and openings are disposed on the left and right sides of the partition boards near the rear side.

In an embodiment of the utility model, the heat dissipation part comprises a dust-proof plate and heat dissipation fans, wherein the heat dissipation fans are arranged at the positions, close to the upper side and the lower side, of the left side of the testing machine body, a plurality of heat dissipation holes are formed at the positions, corresponding to the two heat dissipation fans, of the left side of the testing machine body, air inlets are formed at the positions, close to the upper side and the lower side, of the right side of the testing machine body, the dust-proof plate is arranged in the two air inlets, and the right sides of the two dust-proof plates are level with the outer surface of the testing machine body.

In one embodiment of the utility model, the cooling part comprises a water cooling tank and a water delivery pipe, wherein the water cooling tank is arranged above the tester body near the rear side, one side of the water cooling tank is provided with the water delivery pipe, one end of the water delivery pipe penetrates through the surface of the tester body from the outside of the tester body, and is connected with the plurality of partition boards through the holes from top to bottom in sequence, and finally is connected with the water cooling tank again.

In one embodiment of the utility model, the sealing part comprises a mounting plate, an air cylinder, a telescopic shaft, a connecting plate and sealing plates, wherein the mounting plate is arranged at the positions, close to the upper part, of the left side and the right side of the testing machine body, the air cylinder is arranged above the two mounting plates, the telescopic shaft is arranged at the output ends of the two air cylinders, the two mounting plates are provided with through holes, the bottom ends of the two telescopic shafts extend to the lower part of the mounting plate through the adjacent through holes, the connecting plates are arranged at the positions, close to the upper side and the lower side, of the inner sides of the two telescopic shafts, the sealing plates are arranged at the inner sides of the plurality of connecting plates, and the sealing plates are respectively positioned at the positions of the heat dissipation holes and the dust-proof plates and are mutually attached to the outer surface of the testing machine body.

In one embodiment of the utility model, the cleaning part comprises a rectangular plate and bristles, wherein the rectangular plate is arranged below the two sealing plates on the right side, the bristles are arranged on the inner sides of the two rectangular plates, and the two bristles are mutually attached to the tester body.

In one embodiment of the utility model, the collecting part comprises a shell, collecting boxes and pull rings, wherein the shells are arranged below the two rectangular plates, the inner sides of the two shells are respectively arranged on the tester body, the collecting boxes are respectively arranged in the two shells, the openings of the two collecting boxes are respectively upwards, and the pull rings are respectively arranged on the front sides of the two collecting boxes.

In an embodiment of the utility model, the collecting part further comprises sliding blocks, the sliding blocks are arranged below the two collecting boxes and close to the left side and the right side, two sliding grooves matched with the sliding blocks are formed in the bottoms of the two inner parts of the shell, and a plurality of sliding blocks are arranged in the adjacent sliding grooves in a sliding mode.

The beneficial effects of the utility model are as follows: when the quick cooling high-temperature reverse bias testing machine is used, when the testing is finished and the heat dissipation work is ready to be carried out, the water in the water cooling box can circularly flow in the water conveying pipe, so that the cooling water always flows in the partition plate, meanwhile, the two air cylinders drive the telescopic shafts to move upwards for a small distance, drive the two sealing plates to be staggered with the plurality of heat dissipation holes and the air inlets upwards, enable the plurality of heat dissipation holes and the air inlets to be exposed, then the two heat dissipation fans are started, the heat in the testing machine body is quickly discharged from the plurality of heat dissipation holes, after the heat dissipation is finished, the heat dissipation fans stop rotating, the cooling water in the water conveying pipe stops flowing, the air cylinders drive the telescopic shafts to move downwards, and the plurality of sealing plates are enabled to block the plurality of heat dissipation holes and the air inlets downwards again, to the inside test machine body that seals, the test machine of being convenient for carries out the test next time, at the in-process that a plurality of closing plates upwards or downwardly moved, two closing plates on right side can drive two rectangular plates and remove, thereby make the brush hair on two rectangular plates clear up the dust on two dust guard, can prevent dust jam dust guard, guaranteed the intake, thereby can ensure the radiating efficiency to the inside of test machine body, the dust after the clearance is collected to the inside of collecting box that drops, when need clear up the inside dust of collecting box, the accessible pull ring pulls out the collecting box to the front side, make it break away from the shell and can dismantle it, then can clear up the dust of its inside, the efficiency to the dust clearance has been promoted, the effectual amount of labour that reduces the operator.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some examples of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic perspective view of a rapid cooling high temperature reverse bias tester according to an embodiment of the present utility model;

fig. 2 is a schematic perspective view of a supporting portion according to an embodiment of the present utility model;

fig. 3 is a diagram showing a relationship between a heat dissipation portion and a support portion according to an embodiment of the present utility model;

FIG. 4 is a cross-sectional view of a tester body and a separator provided by an embodiment of the present utility model;

FIG. 5 is a diagram showing the relationship between a sealing portion and a supporting portion according to an embodiment of the present utility model;

fig. 6 is an enlarged view at a in fig. 5 provided in an embodiment of the present utility model.

In the figure: 100-working assembly; 110-a support; 111-a tester body; 112-a guard door; 113-a transparent thermal insulation window; 114-a controller; 115-universal wheels; 116-separator; 120-heat dissipation part; 121-heat dissipation holes; 122-dustproof plate; 123-heat dissipation fan; 130-a cooling section; 131-a water cooling tank; 132-a water delivery pipe; 140-sealing part; 141-a mounting plate; 142-cylinder; 143-a telescopic shaft; 144-connecting plates; 145-sealing plate; 200-a dust removal assembly; 210-a cleaning part; 211-rectangular plates; 212-brushing; 220-a collection section; 221-a housing; 222-collecting box; 223-pull ring; 224-sliders.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, based on the embodiments of the utility model, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the utility model.

Examples

Referring to fig. 1-6, the present utility model provides a technical solution: a rapid cooling high temperature reverse bias tester comprises a working assembly 100 and a dust removal assembly 200.

The dust removal assembly 200 is arranged on the right side of the working assembly 100 and is used for cleaning dust on the dust guard 122, air entering the tester body 111 is filtered by the dust guard 122 when passing through the dust guard 122, so that the dust guard 122 is attached to the dust guard 122, and the bristles 212 can be driven to clean the dust on the dust guard 122 in the upward or downward moving process of the sealing plates 145, so that the dust is prevented from blocking the dust guard 122, the air inlet quantity is ensured, and the heat dissipation efficiency of the tester body 111 can be ensured.

Referring to fig. 1-5, the working assembly 100 includes a supporting portion 110, a heat dissipation portion 120, a cooling portion 130 and a sealing portion 140, wherein the heat dissipation portion 120 is disposed in the supporting portion 110, the cooling portion 130 and the sealing portion 140 are disposed on the supporting portion 110, the supporting portion 110 includes a testing machine body 111, a protection door 112, a transparent heat insulation window 113 and a controller 114, the protection door 112 is rotatably mounted at a position near the upper side of the testing machine body 111, the protection door 112 is provided with the transparent heat insulation window 113, the controller 114 is mounted at a position near the lower side of the front side of the testing machine body 111, the protection door 112 can protect during the detection process, the detection condition inside the testing machine body 111 can be observed through the transparent heat insulation window 113, the supporting portion 110 further includes universal wheels 115, the universal wheels 115 are mounted at positions near four corners below the testing machine body 111, the arrangement of the universal wheels 115 can facilitate the whole movement of the testing machine body 111, the flexibility of the whole use is improved, the supporting part 110 also comprises a baffle 116, a plurality of baffles 116 which are arranged up and down are arranged in the tester body 111, a plurality of mounting grooves are formed in the left side and the right side of the inside of the tester body 111, the left side and the right side of the plurality of baffles 116 are arranged in the tester body 111 in a sliding way through the adjacent mounting grooves, the plurality of baffles 116 are arranged in a hollow way, openings are formed in the left side and the right side of the plurality of baffles 116 close to the rear side, the baffles 116 are arranged in a hollow way, cooling water can conveniently enter the inside of the baffles, the heat dissipation part 120 comprises a dust-proof plate 122 and heat dissipation fans 123, the heat dissipation fans 123 are arranged in the left side of the inside of the tester body 111 close to the upper side and the lower side, a plurality of heat dissipation holes 121 are formed in the left side of the tester body 111 corresponding to the two heat dissipation fans 123, air inlets are formed in the right side of the tester body 111 close to the upper side and the lower side, the inside of the two air inlets is provided with the dust-proof plates 122, the right sides of the two dust-proof plates 122 are level with the outer surface of the tester body 111, the heat inside the tester body 111 is dissipated from the plurality of heat dissipation holes 121 through the heat dissipation fan 123, meanwhile, the outside fresh air enters the inside of the tester body 111 in a negative pressure state inside the tester body 111, and circulates in such a way, thereby realizing the heat dissipation effect, realizing the rapid heat dissipation of the heat inside the tester body 111, the dust-proof plates 122 can filter the dust inside the air entering the tester body 111 so as to ensure the cleanliness of the air entering the tester body 111, the cooling part 130 comprises the water cooling box 131 and the water conveying pipe 132, the water cooling box 131 is arranged above the tester body 111 near the rear side, one side of the water cooling box 131 is provided with the water conveying pipe 132, one end of the water conveying pipe 132 passes through the surface of the tester body 111 from the outside of the tester body 111, and the sealing part 140 comprises mounting plates 141, air cylinders 142, telescopic shafts 143, connecting plates 144 and sealing plates 145, wherein the mounting plates 141 are respectively arranged on the left side and the right side of the tester body 111 near the upper side, the air cylinders 142 are respectively arranged on the upper sides of the two mounting plates 141, the telescopic shafts 143 are respectively arranged on the output ends of the two air cylinders 142, the two mounting plates 141 are respectively provided with a perforation, the bottom ends of the two telescopic shafts 143 are respectively extended to the lower side of the mounting plates 141 through adjacent perforation, the connecting plates 144 are respectively arranged on the inner sides of the two telescopic shafts 143 near the upper side and the lower side of the two mounting plates 141, the sealing plates 145 are mounted on the inner sides of the plurality of connecting plates 144, and the plurality of sealing plates 145 are respectively located at the plurality of heat dissipation holes 121 and the dust-proof plate 122 and are mutually attached to the outer surface of the tester body 111, and the sealing plates 145 move downwards to shield the plurality of heat dissipation holes 121 and the two air inlets, so that the inside of the tester body 111 is sealed, and the testing effect on the tested element is guaranteed during high-temperature testing.

Please refer to fig. 1, fig. 4 and fig. 5, dust removal assembly 200 includes cleaning part 210 and collecting part 220, cleaning part 210 sets up on sealing part 140, collecting part 220 sets up the below at cleaning part 210, cleaning part 210 includes rectangular plate 211, rectangular plate 211 and brush hair 212 are all installed to the below of two closing plates 145 on right side, brush hair 212 is all installed to the inboard of two rectangular plates 211, and the mutual laminating between two brush hair 212 and the test machine body 111, brush hair 212 can be convenient for clear up the dust on two dust-proof plates 122, guarantee the unobstructed nature of hole on the dust-proof plate 122, collecting part 220 includes shell 221, collecting box 222 and pull ring 223, the below of two rectangular plates 211 all is equipped with shell 221, and the inboard of two shell 221 all installs on test machine body 111, the inside of two shell 221 all is equipped with collecting box 222, and the opening part of two collecting boxes 222 all faces upwards, the front side of two collecting boxes 222 all installs pull ring 223, collecting box 222 can collect the dust that the clearance was convenient for carry out, can be convenient for to carry out the dust clearance to the collecting box and be convenient for carry out the clearance to the dust clearance, slide block 224 when two inside slide blocks 224 are all installed at two sides 224, the inside slide groove 224 is convenient for two and two side of the inside of the slide blocks 224, the slide block 224 is equipped with the inside of two shell 221, the slide blocks 224 is convenient for be installed at two inside the two shell 224, the inside the two

shell

221, 224 is easy to be installed.

Specifically, the working principle of the rapid cooling high-temperature reverse bias testing machine is as follows: during the use, when the test is accomplished, when preparing to dispel the heat, the water in the water-cooling tank 131 can flow at raceway 132 inner loop, make the inside of baffle 116 have cooling water to flow all the time, simultaneously, two cylinders 142 drive telescopic shaft 143 and upwards remove a short distance, drive two closing plates 145 upwards with a plurality of louvres 121 and air intake stagger, make a plurality of louvres 121 and air intake expose, afterwards, two cooling fans 123 start, with the inside heat of test machine body 111 follow a plurality of louvres 121 quick discharge, after the heat dissipation is accomplished, cooling fan 123 stops rotating, cooling water in raceway 132 stops flowing, cylinder 142 drives telescopic shaft 143 downwardly moving, make a plurality of closing plates 145 down block a plurality of louvres 121 and air intake, seal the inside of test machine body 111, the test machine of being convenient for carries out the next test, in the in-process that a plurality of closing plates 145 upwards or downwardly move, two closing plates 145 on the right side can drive two air intake, thereby make brush hair 212 on two rectangular plates 211 can be to the inside discharge that the heat is followed a plurality of louvres 121, the cooling fan 123 stops flowing, the cooling water in raceway 132 stops flowing, the cylinder 142 drives telescopic shaft 143 downwardly moving, the inside is sealed up, the test machine body is sealed to the inside is carried out to the dust collecting box is guaranteed to the dust, the dust can be carried out to the dust collecting box is carried out, the dust collecting box is can be carried out the dust has been carried out, the dust collecting the dust has been removed, and can has been removed the dust has been removed, and can has been cleaned dust can has been removed and has dust can has been removed.

It should be noted that, specific model specifications of the tester body 111, the controller 114, the heat dissipation fan 123 and the air cylinder 142 need to be determined by selecting a model according to actual specifications of the device, and a specific model selection calculation method adopts the prior art in the art, so that detailed descriptions thereof are omitted.

The power supply of the tester body 111, the controller 114, the heat dissipation fan 123, and the air cylinder 142 and the principle thereof will be apparent to those skilled in the art, and will not be described in detail herein.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, and various modifications and variations may be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A high temperature reverse bias voltage testing machine capable of rapidly reducing temperature is characterized by comprising

A working assembly (100), wherein the working assembly (100) comprises a supporting part (110), a heat dissipation part (120), a cooling part (130) and a sealing part (140), the heat dissipation part (120) is arranged inside the supporting part (110), and the cooling part (130) and the sealing part (140) are both arranged on the supporting part (110);

the dust removal assembly (200), the dust removal assembly (200) includes clearance portion (210) and collection portion (220), clearance portion (210) set up on sealing portion (140), collection portion (220) set up in clearance portion (210) below.

2. The rapid cooling high-temperature reverse bias testing machine according to claim 1, wherein the supporting portion (110) comprises a testing machine body (111), a protective door (112), a transparent heat insulation window (113) and a controller (114), the protective door (112) is rotatably installed at the position, close to the upper side, of the front side of the testing machine body (111), the transparent heat insulation window (113) is arranged on the protective door (112), and the controller (114) is installed at the position, close to the lower side, of the front side of the testing machine body (111).

3. The rapid cooling high temperature reverse bias testing machine according to claim 2, wherein the supporting portion (110) further comprises universal wheels (115), and the universal wheels (115) are mounted at the positions, close to four corners, of the lower portion of the testing machine body (111).

4. The rapid cooling high-temperature reverse bias testing machine according to claim 2, wherein the supporting portion (110) further comprises a partition plate (116), a plurality of partition plates (116) are arranged in the testing machine body (111) in a vertical mode, a plurality of mounting grooves are formed in the left side and the right side of the testing machine body (111), the left side and the right side of the partition plates (116) are slidably arranged in the testing machine body (111) through the adjacent mounting grooves, the partition plates (116) are hollow, and openings are formed in the left side and the right side of the partition plates (116) close to the rear side.

5. The rapid cooling high-temperature reverse bias testing machine according to claim 2, wherein the heat dissipation portion (120) comprises a dust-proof plate (122) and heat dissipation fans (123), the heat dissipation fans (123) are installed at the positions, close to the upper side and the lower side, of the left side of the testing machine body (111), a plurality of heat dissipation holes (121) are formed at the positions, corresponding to the two heat dissipation fans (123), of the left side of the testing machine body (111), air inlets are formed at the positions, close to the upper side and the lower side, of the right side of the testing machine body (111), the dust-proof plates (122) are installed in the two air inlets, and the right sides of the two dust-proof plates (122) are level with the outer surface of the testing machine body (111).

6. The rapid cooling high-temperature reverse bias testing machine according to claim 4, wherein the cooling part (130) comprises a water cooling tank (131) and a water delivery pipe (132), the water cooling tank (131) is installed at the position, close to the rear side, above the testing machine body (111), one side of the water cooling tank (131) is provided with the water delivery pipe (132), one end of the water delivery pipe (132) penetrates through the surface of the testing machine body (111) from the outside of the testing machine body (111), and is connected with a plurality of partition plates (116) through the holes from top to bottom in sequence, and finally is connected with the water cooling tank (131) again.

7. The rapid cooling high-temperature reverse bias testing machine according to claim 5, wherein the sealing portion (140) comprises a mounting plate (141), an air cylinder (142), a telescopic shaft (143), a connecting plate (144) and a sealing plate (145), the mounting plate (141) is mounted on the left side and the right side of the testing machine body (111) near the upper side, the air cylinder (142) is mounted on the upper side of the two mounting plates (141), the telescopic shaft (143) is mounted on the output end of the two air cylinders (142), the two mounting plates (141) are provided with through holes, the bottom ends of the two telescopic shafts (143) extend to the lower side of the mounting plates (141) through the adjacent through holes, the connecting plate (144) is mounted on the inner sides of the two telescopic shafts (143) near the upper side and the lower side, the sealing plate (145) is mounted on the inner sides of the plurality of the connecting plates (144), and the sealing plate (145) is located in the plurality of heat dissipation holes (121) and the heat dissipation plate (122) respectively, and the sealing plate (145) are attached to the outer surface of the testing machine.

8. The rapid cooling high temperature reverse bias testing machine according to claim 7, wherein the cleaning portion (210) comprises a rectangular plate (211) and bristles (212), the rectangular plate (211) is installed below the two sealing plates (145) on the right side, the bristles (212) are installed on the inner sides of the two rectangular plates (211), and the two bristles (212) are mutually attached to the testing machine body (111).

9. The rapid cooling high temperature reverse bias testing machine according to claim 8, wherein the collecting portion (220) comprises a housing (221), a collecting box (222) and a pull ring (223), the housing (221) is arranged below the two rectangular plates (211), the inner sides of the two housings (221) are arranged on the testing machine body (111), the collecting boxes (222) are arranged inside the two housings (221), the openings of the two collecting boxes (222) face upwards, and the pull ring (223) is arranged on the front sides of the two collecting boxes (222).

10. The rapid cooling high temperature reverse bias testing machine according to claim 9, wherein the collecting portion (220) further comprises a sliding block (224), the sliding blocks (224) are installed at the positions, close to the left side and the right side, of the lower portions of the two collecting boxes (222), sliding grooves matched with the sliding blocks (224) are formed in the bottoms of the inner portions of the two shells (221), and the sliding blocks (224) are slidably arranged in the adjacent sliding grooves.