Strength testing device for research and development of environment-friendly building materials

Abstract

The invention provides a strength testing device for research and development of environment-friendly building materials, and relates to the technical field of research and development testing. A rectangular rod is arranged at the corner position of the top end of the main body, a side plate is arranged on each of the two sides of the main body, a bottom piece is installed in each side plate, a round hole is formed in each of the two ends of each bottom piece, a stress piece is arranged at the bottom of each bottom piece, and the bottom of each stress piece is of an inclined structure. When a building material is placed above the moving part or the pressing part presses the building material to move downwards, the stress part can make contact with the stress plate, due to the fact that the top end of the stress part is of an inclined structure and the stress plate is of a wedge-shaped structure, the stress plate can be stressed to move inwards, the pushing part can be driven to move, and then the building material is automatically pushed to be centered for detection. The building material strength testing device solves the problems that if a building material is not centered, strength testing is not accurate enough, and a structure for assisting in controlling the building material to be centered is lacked.

Description

Technical Field

[0001] The present invention relates to the technical field of R & D testing, and particularly relates to a strength testing device for the R & D of environmental protection building materials. Background Art

[0002] When conducting the R & D of environmental protection building materials, it is usually necessary to conduct strength tests on the environmental protection building materials to detect whether the environmental protection building materials meet the usage standards. At this time, a strength testing device is required; However, for the current traditional building material strength testing devices, after the building materials are placed, if the building materials are not centered, it is easy to cause uneven stress, resulting in inaccurate strength testing. There is a lack of a structure for assisting in controlling the centering of the building materials, and the structure for controlling the centering of the building materials cannot be automatically triggered after the building materials are placed. After the structure for detecting the strength of the building materials is stressed, it is prone to tilting and damage, and there is a lack of a structure for assisting in controlling the vertical movement detection. Summary of the Invention

[0003] In view of this, the present invention provides a strength testing device for the R & D of environmental protection building materials, which has a pushing member. The pushing member can move and displace under force on both sides of the main body, so that the two pushing members can clamp the building materials in a rectangular shape, enabling the building materials to be effectively centered for detection.

[0004] The present invention provides a strength testing device for the R & D of environmental protection building materials, which specifically includes: a main body; the main body is of a rectangular structure, and a rectangular rod is respectively provided at each top corner position of the main body. A rectangular plate is provided at the top of the main body, and a bottom block is respectively provided at each bottom corner position of the main body. A side plate is respectively provided on both sides of the main body. A bottom member is installed inside each side plate. The bottom member is of a U-shaped structure, and a round hole is respectively provided at both ends of the bottom member. The bottom of the bottom member is provided with a stress member, and the bottom of the stress member is of an inclined structure; a side member, the side member is of a T-shaped structure, and there are two side members in total. The two side members are installed at the top of the main body. A groove is provided at the top of each side member. A rectangular through groove is respectively provided on both sides of each side member. A round hole is respectively provided on both sides of each side member. A stress plate is connected to the outside of each side member. A pushing member is sleeved outside each stress plate. The pushing member is of a rectangular frame structure. Two moving wheels are provided at the bottom of each pushing member. An auxiliary member is respectively provided on both sides of the inner side of the top of each pushing member. The auxiliary member is of a wedge-shaped structure; a top plate, the top plate is of a rectangular structure, the top plate is located at the top of the main body, the bottom corner positions of the top plate are connected to the tops of the rectangular rods, a servo electric cylinder is provided at the middle position of the top plate, a control groove is respectively provided on both sides of the top plate, two control plates are installed inside each control groove. The control plate is of a rectangular structure. A square groove is provided at the bottom of each control plate. Two support plates are provided on the inner side of the bottom of each control plate. The support plate is of a wedge-shaped structure.

[0005] Optionally, two guide pieces are respectively provided on both sides of the rectangular plate of the main body, and the guide piece is an F-shaped structure, and two guide rods are respectively provided on both sides of the rectangular plate, and the guide rods are T-shaped shaft structures, the guide rods are at the outside of the guide pieces, and springs are mounted on the outside of the guide rods, and the guide rods are inserted into the circular holes on both sides of the side pieces; the side plates are inverted U-shaped structures, and two round rods are provided at the bottom of the side plates, and a spring is mounted on the outside of each round rod, and the round rods are inserted into the circular holes on both sides of the bottom piece, and a top groove is provided at the top of each side plate, and the top groove is a rectangular structure; a contact block is provided at the middle position of the top of each side plate, the contact block is an inverted U-shaped structure, and both sides of the bottom of the contact block are inclined structures, the contact block is made of rubber, and the top of the contact block is provided with evenly arranged conical grooves, and a moving piece is installed inside each top groove, the moving piece is connected to the top of the bottom piece, the moving piece is a T-shaped structure, and a rectangular groove is provided at the middle position of the top of the moving piece, and a contact block is embedded in the rectangular groove.

[0006] Optionally, the force-bearing plate is a wedge-shaped structure, and each of the force-bearing plates is provided with a slide groove on both sides, and the slide groove is a rectangular structure; the bottom of each of the force-bearing plates is provided with evenly arranged card grooves, and the card grooves are of a rectangular structure; each of the pushing members is provided with a slide plate on both sides inside, and the slide plate is of a rectangular structure, and the slide plate is embedded in the slide groove; each of the pushing members is provided with an installation groove in the middle position at the bottom, and the installation groove is a T-shaped structure, and a card block is installed in the inside of each installation groove through two springs, and the card block is an L-shaped structure, and the top side of the card block is provided with a groove, and the top of the card block is inserted into the inside of the card groove.

[0007] Optionally, the control groove is a T-shaped structure, and two wedge-shaped grooves are provided on the inner side of each control groove. The bottom transmission connection of the servo electric cylinder is provided with a connecting block, and the connecting block is a circular structure; a pressing piece is fixedly installed at the bottom of the connecting block, and a rotating rod is installed at the bottom of the pressing piece. A fixed groove is respectively provided at both ends of the pressing piece, and the fixed groove is a rectangular structure; a control piece is installed inside each of the control grooves, and the control piece is an L-shaped structure. Each control piece is fixed between two control boards, and a connecting head is inserted into the square groove of the control board. The connecting head is a U-shaped structure and is made of elastic plastic. A rectangular groove is provided in the middle of the side of the connecting head, and a wedge-shaped block is provided at the outer end of the connecting head, and the middle position of the connecting head is embedded in the inside of the fixed groove.

[0008] Beneficial Effects Compared with the conventional testing device, the testing device according to each embodiment of the present invention is provided with a control panel, and the control panel can be used on both sides of the pressing piece to prevent the pressing piece from tilting and being damaged.

[0009] In addition, by setting the force-receiving member, when the building material is placed above the moving member or the pressing member presses the building material to move downward during the use of the device, the force-receiving member can contact the force-receiving plate. Since the top end of the force-receiving member is of an inclined structure and the force-receiving plate is of a wedge-shaped structure, the force-receiving plate can be forced to move inward, so that the pushing member can be driven to displace, and then automatically push the building material to be centered for detection; In addition, by setting the pushing member, when the device is in use, after the force-receiving plate is displaced by force, it can drive the pushing member to move together, so that the pushing member can push the longer end of the building material to move, so that the building material can be centered left and right at the top of the main body. At the same time, the auxiliary member is of a wedge-shaped structure and can control the front and back movement of the building material, so that the building material can be centered front and back for detection. At the same time, the pushing member can move and adjust its position outside the force-receiving plate. After adjusting the position, the clamping block can rise and be inserted into the inside of the clamping groove for limit fixation, so that the pushing member can be adjusted in position for use, and then control the centering detection of building materials of different lengths; In addition, by setting the control board, when the device is in use, the control board can contact the pressing member together with the control member, so that the support board can contact and support the side of the pressing member. When the pressing member moves downward, the control member can keep vertical guiding displacement with the pressing member inside the control groove, and then control the vertical guiding displacement of the pressing member, so that when the pressing member contacts the building material, it will not be inclined and damaged, and the service life of the device is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly introduced below.

[0011] The drawings in the following description only relate to some embodiments of the present invention and do not limit the present invention.

[0012] In the drawings: Figure 1 A schematic diagram of the three-dimensional structure of the strength testing device according to the embodiment of the present invention is shown; Figure 2 A schematic diagram of the bottom view structure of the strength testing device according to the embodiment of the present invention is shown; Figure 3 A schematic diagram of the exploded three-dimensional structure of the strength testing device according to the embodiment of the present invention is shown; Figure 4 A schematic diagram of the exploded bottom view structure of the strength testing device according to the embodiment of the present invention is shown; Figure 5 A schematic diagram of the exploded three-dimensional structure of the main body of the strength testing device according to the embodiment of the present invention is shown; Figure 6 A schematic diagram of the exploded three-dimensional structure of the side member of the strength testing device according to the embodiment of the present invention is shown; Figure 7 Shows a schematic diagram of the exploded bottom-up structure of the side member of the strength testing device according to an embodiment of the present invention; Figure 8 Shows a schematic diagram of the exploded bottom-up structure of the top plate of the strength testing device according to an embodiment of the present invention.

[0013] List of reference numerals 1. Main body; 101. Guide member; 102. Guide rod; 103. Side plate; 104. Top groove; 105. Contact block; 106. Moving member; 107. Bottom member; 108. Force-bearing member; 2. Side member; 201. Force-bearing plate; 202. Slide groove; 203. Card slot; 204. Pushing member; 205. Auxiliary member; 206. Slide plate; 207. Installation groove; 208. Card block; 3. Top plate; 301. Control groove; 302. Connecting block; 303. Pressing member; 304. Fixed groove; 305. Control member; 306. Control board; 307. Support plate; 308. Connecting head. Detailed implementation manners

[0014] In order to make the objectives, solutions, and advantages of the technical solutions of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the specific embodiments of the present invention. Unless otherwise specified, the terms used herein have the ordinary meanings in the art. The same reference numerals in the drawings represent the same components.

[0015] Embodiment: Please refer to Figures 1 to 8 : The present invention provides a strength testing device for the research and development of environmental protection building materials, including: a main body 1; the main body 1 is of a rectangular structure, and a rectangular rod is provided at each corner position at the top of the main body 1 to support and install a top plate 3. A rectangular plate is provided at the top of the main body 1 to assist in installing a guide member 101 and a guide rod 102. A bottom block is provided at each corner position at the bottom of the main body 1 to support the main body 1. A side plate 103 is provided on each side of the main body 1. A bottom member 107 is installed inside each side plate 103. The bottom member 107 is of a U-shaped structure to assist in installing a stress member 108. A round hole is provided at each end of the bottom member 107 to insert a round rod at the bottom of the side plate 103, so that a spring outside the round rod can push the bottom member 107 to rise. A stress member 108 is provided at the bottom of the bottom member 107. The bottom of the stress member 108 is of an inclined structure and can contact the top of a stress plate 201, so that the stress plate 201 can be stressed, thereby driving the side member 2 to displace in a guiding manner, enabling the pushing member 204 to move, and further pushing the building material to be centered for detection; a side member 2, the side member 2 is of a T-shaped structure, and there are two side members 2 in total. The two side members 2 are installed at the top of the main body 1 and can displace in a guiding manner on both sides at the top of the main body 1. A groove is provided at the top of each side member 2. A rectangular through groove is provided on each side of each side member 2 to enable the top of the guide member 101 to displace in a guiding manner inside it. A round hole is provided on each side of each side member 2 to insert a guide rod 102, so that a spring outside the guide rod 102 can assist in controlling the movement. A stress plate 201 is connected to the outside of each side member 2. A pushing member 204 is sleeved on the outside of each stress plate 201. The pushing member 204 is of a rectangular frame structure, so that the two pushing members 204 can be stressed and move simultaneously, and further push the building material to be centered for detection. Two moving wheels are provided at the bottom of each pushing member 204 to enable the pushing member 204 to displace in a guiding manner. An auxiliary member 205 is provided on each side of the inner side of the top of each pushing member 204. The auxiliary member 205 is of a wedge-shaped structure and can assist in controlling the building material to move centered, so that the building material can be centered for detection front and back; a top plate 3, the top plate 3 is of a rectangular structure, the top plate 3 is located at the top of the main body 1, and the bottom corner positions of the top plate 3 are connected to the tops of the rectangular rods and can be stably fixed at the top of the main body 1. A servo electric cylinder is provided at the middle position of the top plate 3. The servo electric cylinder can drive the pressing member 303 to move downward, so that the pressing member 303 can contact the building material, and further detect the strength of the building material. A control groove 301 is provided on each side of the top plate 3. Two control plates 306 are installed inside each control groove 301. The control plate 306 is of a rectangular structure and can be located on both sides of the pressing member 303, so that the pressing member 303 can be supported and controlled to be in a vertical state. A square groove is provided at the bottom of each control plate 306. Two support plates 307 are provided on the inner side of the bottom of each control plate 306. The support plates 307 are of a wedge-shaped structure and can assist in pushing and supporting the pressing member 303.

[0016] Reference Figure 5, two guide members 101 are respectively provided on both sides of the rectangular plate of the main body 1. The guide member 101 is an F-shaped structure, which can assist in supporting the side member 2 for guiding displacement. Two guide rods 102 are respectively provided on both sides of the rectangular plate. The guide rod 102 is a T-shaped shaft structure, which is used to insert into the round holes inside the side member 2, so that the side member 2 can move in a guided manner. The guide rod 102 is located outside the guide member 101, and a spring is sleeved outside the guide rod 102, which can push the side member 2 to move outward and reset. The guide rod 102 is inserted into the round holes on both sides of the side member 2; the side plate 103 is an inverted U-shaped structure, which can assist in installing the moving member 106 and the bottom member 107. Two round rods are provided at the bottom of the side plate 103, which are used to insert into the round holes inside the bottom member 107. A spring is sleeved outside each round rod, and the round rod is inserted into the round hole of the bottom member 107. A top groove 104 is provided at the top of each side plate 103. The top groove 104 is a rectangular structure, which is used to enable the moving member 106 to move in a guided manner inside it; a contact block 105 is provided at the middle position of the top of each side plate 103. The contact block 105 is an inverted U-shaped structure. Both sides of the bottom of the contact block 105 are inclined structures. The contact block 105 is made of rubber and can be in auxiliary contact with building materials. When the building materials are subjected to pressure detection, the building materials can strengthen the contact and fixing effect with the contact block 105. The top of the contact block 105 is provided with tapered grooves arranged evenly. A moving member 106 is installed inside each top groove 104. The moving member 106 is connected to the top of the bottom member 107 and can drive the bottom member 107 to move in a guided manner together. The moving member 106 is a T-shaped structure. A rectangular groove is provided at the middle position of the top of the moving member 106, and the contact block 105 is embedded inside the rectangular groove, so that the contact block 105 will not move downward together with the moving member 106.

[0017] Reference Figure 6 and Figure 7, the force-bearing plate 201 is a wedge-shaped structure for contacting the bottom of the force-bearing member 108. After the force-bearing member 108 moves downward, the force-bearing plate 201 can be displaced laterally under force. A chute 202 is provided on each side of each force-bearing plate 201. The chute 202 is a rectangular structure for guiding the sliding plate 206 to move inside it, so that the pusher 204 can be adjusted in position for use; a uniformly arranged card slot 203 is provided at the bottom of each force-bearing plate 201. The card slot 203 is a rectangular structure. After the pusher 204 is adjusted in position, the top end of the locking block 208 can be inserted into the inside of the card slot 203 for limit fixation. A sliding plate 206 is provided on each side inside each pusher 204. The sliding plate 206 is a rectangular structure. The sliding plate 206 is embedded inside the chute 202, which can drive the pusher 204 to move in a guided manner and can also maintain horizontal movement; an installation groove 207 is provided at the middle position of the bottom of each pusher 204. The installation groove 207 is a T-shaped structure for installing the locking block 208, so that the locking block 208 can be displaced in a guided manner inside it. A locking block 208 is installed inside each installation groove 207 through two springs. The locking block 208 is an L-shaped structure. A groove is provided on the side of the top end of the locking block 208. The top end of the locking block 208 is inserted into the inside of the card slot 203, which can drive the pusher 204 to be limited and fixed.

[0018] Reference Figure 8The control groove 301 is a T-shaped structure, so that the control plate 306 and the control member 305 can be guided for installation and use. Two wedge-shaped grooves are provided on the inner side of each control groove 301 to allow the support plate 307 to pass through it. The bottom transmission connection of the servo electric cylinder is connected with a connecting block 302, so that the servo electric cylinder can drive the connecting block 302 to move together. The connecting block 302 is a circular structure; a pressing piece 303 is fixedly installed at the bottom of the connecting block 302 to contact with the building material and then detect the strength of the test. A rotating rod is installed at the bottom of the pressing piece 303, so that after the pressing piece 303 contacts the test, the pushing piece 204 can smoothly contact the rotating rod while pushing the building material to move in the center. A fixed groove 304 is provided at each end of the pressing piece 303. The fixed groove 304 is a rectangular structure and is used to insert the connector 308. The pressure piece 303 can be connected to the control board 306; a control piece 305 is installed inside each control groove 301, and the control piece 305 is an L-shaped structure. Each control piece 305 is fixed between two control boards 306, and can drive the control board 306 to guide displacement. A connector 308 is inserted into the square groove of the control board 306, and the connector 308 is a U-shaped structure. The connector 308 is made of elastic plastic material and can be easily deformed, so that it is convenient to detach from the inside of the square groove. A rectangular groove is provided in the middle position of the side of the connector 308, so that the side of the connector 308 can be pinched and pressed, so that the wedge block can be detached from the inside of the square groove. A wedge block is provided at the outer end of the connector 308, and the middle position of the connector 308 is embedded in the inside of the fixed groove 304, so that the control board 306 and the pressure piece 303 are connected together for use.

[0019] Specific usage and functions of this embodiment: In the present invention, when the device needs to be used, first set the constant pushing pressure of the servo electric cylinder, and then manually control the installation of the two control parts 305, so that the control parts 305 can move downward together with the control board 306, so that the control parts 305 and the control board 306 are inserted into the control slot 301, so that the control board 306 can be on both sides of the pressing part 303, so that the support board 307 can contact both sides of the pressing part 303, and then control the installation of the connector 308, so that the connector 308 can be inserted into the square slot, and the middle position of the connector 308 can be embedded into the fixing slot 304. Then manually control the building materials to be placed above the moving part 106, so that the building materials can press the moving part 106 to move downward by their own weight. After the moving part 106 moves downward, the stress part 108 contacts the top of the stress board 201, so that the stress board 201 can be stressed and displaced directionally, so that the two side parts 2 can move inward, so that the two pushing parts 204 can be displaced directionally at the same time, so that the two pushing parts 204 can contact the side of the building materials, so that the detection can be pushed to move left and right, so that the building materials can be centered left and right. At the same time, the auxiliary part 205 can control the building materials to be centered front and back, so that the building materials can be centered for detection. Then control the servo electric cylinder to operate, so that the servo electric cylinder can control the pressing part 303 to move downward. While the pressing part 303 moves downward, the control parts 305 and the control board 306 can be displaced directionally in the control slot 301, so that the pressing part 303 can contact the building materials, and then detect the strength of the building materials. If the building materials meet the strength standard, they will not deform. If the building materials deform, it means that the building materials do not meet the production standard. When the detected building materials are lighter, when the pressing part 303 contacts the building materials, the moving part 106 can be moved downward, so that the pushing part 204 can push the building materials to be centered, so that the building materials can contact and displace with the rotating rod, so that the building materials will not be affected by resistance, and the lighter building materials can also be effectively centered for detection. When the building materials are pressed to detect the strength, the building materials can strengthen the contact and fixing effect with the contact block 105, so that the building materials will not be displaced.

[0020] Finally, it should be noted that when the present invention describes the positions of various components and their cooperation relationships, etc., usually one / a pair of components are taken as examples. However, those skilled in the art should understand that such positions, cooperation relationships, etc. also apply to other components / other pairs of components.

[0021] The above is only an exemplary embodiment of the present invention, rather than being used to limit the protection scope of the present invention. The protection scope of the present invention is determined by the appended claims.

Claims

1. A strength testing device for the development of environmentally friendly building materials, characterized in that: include: A main body (1); a rectangular rod is provided at each corner of the top of the main body (1); a rectangular plate is provided at the top of the main body (1); a bottom block is provided at each corner of the bottom of the main body (1); a side plate (103) is provided on each side of the main body (1); a bottom piece (107) is installed inside each side plate (103); a circular hole is provided at each end of the bottom piece (107); a force-bearing piece (108) is provided at the bottom of the bottom piece (107); and the bottom of the force-bearing piece (108) is an inclined structure; a side piece (2); two side pieces (2) are provided in total; the two side pieces (2) are installed at the top of the main body (1); a groove is provided at the top of each side piece (2); a rectangular through groove is provided on each side of each side piece (2); a circular hole is provided on each side of each side piece (2); and each side piece (2) is connected to a A force-bearing plate (201), each force-bearing plate (201) is sleeved with a pushing member (204) on the outside, each pushing member (204) is provided with two moving wheels at the bottom, each pushing member (204) is provided with an auxiliary member (205) on both sides of the inner side of the top end of each pushing member (204), and the auxiliary member (205) is a wedge-shaped structure; a top plate (3), the top plate (3) is located at the top end of the main body (1), the bottom corner position of the top plate (3) is connected to the top end of the rectangular rod, a servo electric cylinder is provided at the middle position of the top plate (3), a control groove (301) is provided on both sides of the top plate (3), two control plates (306) are installed inside each control groove (301), each control plate (306) is provided with a square groove at the bottom, and two support plates (307) are provided on the inner side of the bottom of each control plate (306), and the support plates (307) are a wedge-shaped structure.

2. A strength testing device for the development of environmentally friendly building materials as claimed in claim 1, characterized in that: Two guide pieces (101) are respectively provided on both sides of the rectangular plate of the main body (1), the guide piece (101) being an F-shaped structure, two guide rods (102) are respectively provided on both sides of the rectangular plate, the guide rods (102) are located outside the guide piece (101), springs are sleeved on the outside of the guide rods (102), and the guide rods (102) are inserted into the circular holes on both sides of the side piece (2).

3. A strength testing device for the development of environmentally friendly building materials as claimed in claim 1, characterized in that: Two round rods are provided at the bottom of the side plate (103), a spring is sleeved on the outside of each round rod, and the round rod is inserted into the circular hole of the bottom piece (107). A top groove (104) is provided at the top of each side plate (103).

4. A strength testing device for the development of environmentally friendly building materials as claimed in claim 3, characterized in that: A contact block (105) is provided at the middle position of the top of each side plate (103), both sides of the bottom of the contact block (105) are inclined structures, the contact block (105) is made of rubber, the top of the contact block (105) is provided with evenly arranged conical grooves, a moving part (106) is installed inside each top groove (104), the moving part (106) is connected to the top of the bottom part (107), a rectangular groove is provided at the middle position of the top of the moving part (106), and the contact block (105) is embedded in the rectangular groove.

5. A strength testing device for the development of environmentally friendly building materials as claimed in claim 1, characterized in that: The force-bearing plates (201) are wedge-shaped structures, and a sliding groove (202) is provided on both sides of each force-bearing plate (201).

6. A strength testing device for the development of environmentally friendly building materials as claimed in claim 1, characterized in that: The bottom of each of the force-bearing plates (201) is provided with evenly arranged slots (203), and each of the pushing members (204) is provided with a slide plate (206) on both sides thereof, and the slide plate (206) is embedded in the slide groove (202).

7. A strength testing device for the development of environmentally friendly building materials as claimed in claim 6, characterized in that: A mounting groove (207) is provided at the middle position of the bottom of each pushing member (204), a clamping block (208) is installed inside each mounting groove (207) via two springs, a groove is provided on the top side of the clamping block (208), and the top of the clamping block (208) is inserted into the inside of the clamping groove (203).

8. A strength testing device for the development of environmentally friendly building materials as claimed in claim 1, characterized in that: The control groove (301) is a T-shaped structure, and two wedge-shaped grooves are provided on the inner side of each control groove (301). The bottom of the servo electric cylinder is transmission-connected to a connecting block (302), and the connecting block (302) is a circular structure.

9. A strength testing device for the development of environmentally friendly building materials as claimed in claim 8, characterized in that: A pressing piece (303) is fixedly mounted on the bottom of the connecting block (302), a rotating rod is mounted on the bottom of the pressing piece (303), and a fixing groove (304) is respectively provided at both ends of the pressing piece (303).

10. A strength testing device for the development of environmentally friendly building materials as claimed in claim 9, characterized in that: A control member (305) is installed inside each of the control slots (301). Each control member (305) is fixed between two control boards (306). A connector (308) is inserted into the square slot of the control board (306). The connector (308) is made of elastic plastic material. A rectangular slot is provided in the middle of the side of the connector (308). A wedge-shaped block is provided at the outer end of the connector (308). The middle of the connector (308) is embedded in the fixing slot (304).

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