Combined oil-free sliding plate connecting structure

Abstract

The utility model belongs to the field of oil-free sliding plates, and particularly relates to a combined type oil-free sliding plate connecting structure which comprises a first oil-free sliding plate. A second oil-free sliding plate is arranged on one side of the first oil-free sliding plate; a plurality of first toothed plates are fixedly connected to the end parts of the first oil-free sliding plate and the second oil-free sliding plate; the other end of the first oil-free sliding plate and the other end of the second oil-free sliding plate are each provided with a plurality of first fixing grooves. The first fixing groove and the first toothed plate are correspondingly arranged; sliding grooves are symmetrically formed in the inner side wall of the first fixing groove. The inner side wall of the sliding groove is slidably connected with two second toothed plates. The distance between the second toothed plate and the first toothed plate can be adjusted by controlling the transverse plate, the clamping relation of the first toothed plate and the second toothed plate is controlled by the device, the device can quickly complete mounting and dismounting of the first oil-free sliding plate, and the convenience of mounting and dismounting of the first oil-free sliding plate and the second oil-free sliding plate is improved.

Description

Technical Field

[0001] The utility model relates to the field of oil-free slide plates, in particular to a combined oil-free slide plate connection structure. Background Art

[0002] Oil-free slide is a new type of lubricated slide that combines the characteristics of metal bearings and oil-free lubricated slide. It has a metal matrix to bear the load, while the specially formulated solid lubricating material plays a lubricating role.

[0003] The application of oil-free skateboards is mainly reflected in the following aspects: Oil-free skateboards are often used in the moving parts of various mechanical equipment. Since it does not require the use of lubricating oil, it can significantly reduce the problems caused by oil pollution and oil leakage; In the food processing industry, the application of oil-free skateboards can ensure the hygiene and safety of the production process; In the field of precision manufacturing, oil-free skateboards have a low friction coefficient and low wear, and can meet the requirements of high precision, high speed and high reliability.

[0004] Existing oil-free slide plates are usually assembled by bolt connection. It is found in use observation that when the oil-free slide plate needs to be disassembled, it takes a long time to remove the bolts, which increases the time required for installation and disassembly of the oil-free slide plate.

[0005] Therefore, in order to solve the above problems, a combined oil-free slide plate connection structure is proposed. Utility Model Content

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the utility model to solve its technical problems is: the utility model describes a combined oil-free slide plate connection structure, comprising a first oil-free slide plate; a second oil-free slide plate is arranged on one side of the first oil-free slide plate; a plurality of first tooth plates are fixedly connected to the ends of the first oil-free slide plate and the second oil-free slide plate; a plurality of first fixing grooves are provided at the other ends of the first oil-free slide plate and the second oil-free slide plate; the first fixing grooves and the first tooth plates are arranged correspondingly; the inner side wall of the first fixing groove is symmetrically provided with sliding grooves; the inner side wall of the sliding groove is slidably connected with two second tooth plates; the inner side wall of the first fixing groove is fixed A first spring is connected; a cross plate is fixedly connected to the end of the first spring; a connecting rod is symmetrically hinged in the middle of the cross plate; the adjacent connecting rods and the second tooth plate are in a hinged relationship; a plurality of first circular holes are opened in the middle of the cross plate; a plurality of second circular holes are opened in the middle of the first oil-free skateboard; the first circular holes and the second circular holes are correspondingly arranged; the control cross plate can adjust the distance between the second tooth plate and the first tooth plate, so as to realize the control of the device on the engagement relationship between the first tooth plate and the second tooth plate, so that the device can quickly complete the installation and removal of the first oil-free skateboard, and improve the convenience of installation and removal between the first oil-free skateboard and the second oil-free skateboard.

[0008] Preferably, a plurality of second springs are symmetrically fixed to the inner side wall of the first fixing groove; the ends of adjacent second springs are fixed to a top plate; a plurality of second fixing grooves are opened in the middle of the top plate; a roller is rotatably connected to the middle of the second fixing groove; through the cooperation of the second spring and the roller, the first tooth plate will be subject to the elastic force applied by the second spring to the roller when it moves, so that the first tooth plate will be corrected when it moves, thereby improving the accuracy of the engagement of the first tooth plate and the second tooth plate and shortening the time required for the alignment of the first tooth plate and the second tooth plate.

[0009] Preferably, a plurality of oil bags are fixedly connected to the middle part of the roller; a plurality of third circular holes are opened in the middle part of the oil bag; through the cooperation of the oil bag and the third circular holes, after the oil bag is squeezed by the first tooth plate, the lubricating oil will flow from the third circular holes to the surface of the first tooth plate, thereby realizing lubrication of the first tooth plate by the device, improving the smoothness of the surface of the first tooth plate, and reducing the jamming that occurs when the first tooth plate and the second tooth plate are engaged.

[0010] Preferably, a plurality of bristles are fixedly connected to the middle portion of the roller; the bristles are arranged in a circular array; by arranging the bristles, the surface of the first tooth plate will be cleaned when the bristles contact the first tooth plate, thereby reducing dust on the surface of the first tooth plate, and at the same time, the bristles will also apply lubricating oil to the surface of the first tooth plate, thereby improving the uniformity of the lubricating oil on the surface of the first tooth plate.

[0011] Preferably, a triangular plate is fixedly connected to the bottom of the first fixed groove; the top of the triangular plate is inclined; the triangular plate is located at the bottom of the top plate; by setting the triangular plate, the triangular plate will cause the dripping lubricating oil to flow to the inside of the slide groove, thereby realizing the reuse of the lubricating oil and the lubrication of the slide groove by the device, improving the utilization rate of the lubricating oil, reducing the pollution of the lubricating oil to the working environment, and also improving the smoothness of the inner wall of the slide groove, reducing the jamming that occurs when the second tooth plate slides.

[0012] Preferably, a plurality of fixed plates are fixedly connected to the top of the triangular plate; a plurality of fourth circular holes are opened in the middle of the fixed plate; by setting the fixed plate, the lubricating oil will flow along the edge of the fixed plate when flowing on the surface of the triangular plate, thereby realizing the guidance of the flow trajectory of the lubricating oil by the device, so that the lubricating oil can accurately reach the inside of the slide groove, thereby enhancing the lubricating effect of the lubricating oil on the slide groove.

[0013] Preferably, a plurality of sponges are rotatably connected to both sides of the first tooth plate; the sponges are arranged in an array; when the first tooth plate enters the first fixed groove, the sponges will also move with the first tooth plate, the sponges will come into contact with the inner wall of the first fixed groove and rotate under the action of friction, and the sponges will absorb dust and lubricating oil attached to the inner wall of the first fixed groove, thereby improving the cleanliness of the inner wall of the first fixed groove.

[0014] The utility model is beneficial in that:

[0015] 1. The utility model describes a combined oil-free slide connection structure, in which the control cross plate can adjust the distance between the second tooth plate and the first tooth plate, so that the device can control the engagement relationship between the first tooth plate and the second tooth plate, so that the device can quickly complete the installation and removal of the first oil-free slide, and improve the convenience of installation and removal between the first oil-free slide and the second oil-free slide.

[0016] 2. The utility model describes a combined oil-free slide plate connection structure, through the cooperation of the second spring and the roller, the first tooth plate will be affected by the elastic force applied by the second spring to the roller when it moves, so that the first tooth plate will be corrected when it moves, thereby improving the accuracy of the engagement of the first tooth plate and the second tooth plate and shortening the time required for the alignment of the first tooth plate and the second tooth plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of the main body of the utility model;

[0019] Figure 2 It is a structural schematic diagram of the first tooth plate in the utility model;

[0020] Figure 3 It is a structural schematic diagram of the second tooth plate in the utility model;

[0021] Figure 4 It is a structural schematic diagram of the roller in the utility model.

[0022] In the figure: 1. first oil-free slide plate; 102. second oil-free slide plate; 103. first tooth plate; 104. first fixed groove; 105. slide groove; 106. second tooth plate; 107. first spring; 108. cross plate; 109. first circular hole; 110. second circular hole; 111. connecting rod; 2. second spring; 22. top plate; 23. roller; 24. second fixed groove; 3. oil bag; 32. third circular hole; 4. bristles; 5. triangle plate; 6. fixed plate; 62. fourth circular hole; 7. sponge. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] Specific examples are given below.

[0025] See also Figures 1 to 3As shown, a combined oil-free slide plate connection structure described in an embodiment of the utility model includes a first oil-free slide plate 1; a second oil-free slide plate 102 is arranged on one side of the first oil-free slide plate 1; the ends of the first oil-free slide plate 1 and the second oil-free slide plate 102 are fixedly connected with a plurality of first tooth plates 103; the other ends of the first oil-free slide plate 1 and the second oil-free slide plate 102 are provided with a plurality of first fixing grooves 104; the first fixing grooves 104 and the first tooth plates 103 are arranged correspondingly; the inner side wall of the first fixing groove 104 is symmetrically provided with sliding grooves 105; the inner side wall of the sliding groove 105 is slidably connected with two second tooth plates 106; the inner side wall of the first fixing groove 104 is fixedly connected with a first spring 107; the first spring 1 07 is fixedly connected with a transverse plate 108 at the end thereof; a connecting rod 111 is symmetrically hingedly connected with the middle of the transverse plate 108; the adjacent connecting rods 111 and the second tooth plate 106 are in a hinged relationship; a plurality of first circular holes 109 are opened in the middle of the transverse plate 108; a plurality of second circular holes 110 are opened in the middle of the first oil-free slide plate 1; the first circular holes 109 and the second circular holes 110 are correspondingly arranged; when working, the transverse plate 108 is first moved to make the first spring 107 in a compressed state, and the angle of the connecting rod 111 will change when the transverse plate 108 moves, and when the angle of the connecting rod 111 changes, the second tooth plate 106 will be driven to move together and slide along the slide groove 105, and when the second tooth plate 106 is in a suitable position When the first oil-free slide plate 1 is moved, the first tooth plate 103 will be driven to move together with the first tooth plate 103. When the first tooth plate 103 moves, it will enter the first fixed groove 104 and contact the second tooth plate 106. When the first oil-free slide plate 1 and the second oil-free slide plate 102 are fitted together, the first tooth plate 103 and the second tooth plate 106 will rub against each other. The first tooth plate 103 will transmit the friction force of the second tooth plate 106 to the first oil-free slide plate 1, so that the first oil-free slide plate 1 is in a stationary state. When the first oil-free slide plate 1 needs to be removed, When the oil-free skateboard 1 is in operation, the latch can be pulled out, and the cross plate 108 will be reset under the elastic force of the first spring 107 and the angle of the connecting rod 111 will change. The connecting rod 111 will move the second tooth plate 106 away from the first tooth plate 103. After the first tooth plate 103 loses the friction force applied by the second tooth plate 106, it will be in an active state. At this time, the first oil-free skateboard 1 can be pulled out from the middle of the second oil-free skateboard 102; the control cross plate 108 can adjust the distance between the second tooth plate 106 and the first tooth plate 103, so as to realize the control of the engagement relationship between the first tooth plate 103 and the second tooth plate 106 by the device, so that the device can quickly complete the installation and removal of the first oil-free skateboard 1, thereby improving the convenience of installation and removal between the first oil-free skateboard 1 and the second oil-free skateboard 102.

[0026] See also Figure 3 and Figure 4 As shown, the inner side wall of the first fixed groove 104 is symmetrically fixed with a plurality of second springs 2; the ends of the adjacent second springs 2 are fixed with a top plate 22; a plurality of second fixed grooves 24 are opened in the middle of the top plate 22; a roller 23 is rotatably connected to the middle of the second fixed groove 24; when the first tooth plate 103 enters the first fixed groove 104, it will contact the top plate 22, and when the first tooth plate 103 and the top plate 22 come into contact, they will also come into contact with the roller 23 and cause the roller 23 to rotate, and after the top plate 22 is squeezed by the first tooth plate 103, the pressure will be transmitted to the second spring 2 and the second spring 2 will be in a compressed state, and then After that, the second spring 2 will release its elastic potential energy and apply elastic force to the top plate 22, and the top plate 22 will transmit the elastic force to the roller 23 and cause the roller 23 to squeeze the first tooth plate 103, so that the first tooth plate 103 will be subjected to additional force when moving and stably engage with the second tooth plate 106; through the cooperation of the second spring 2 and the roller 23, the first tooth plate 103 will be subjected to the elastic force applied by the second spring 2 to the roller 23 when moving, so that the first tooth plate 103 will be corrected when moving, thereby improving the accuracy of the engagement of the first tooth plate 103 and the second tooth plate 106, and shortening the time required for the first tooth plate 103 and the second tooth plate 106 to be aligned.

[0027] See also Figure 4 As shown, a plurality of oil bags 3 are fixedly connected to the middle of the roller 23; a plurality of third circular holes 32 are opened in the middle of the oil bag 3; lubricating oil is injected into the oil bag 3, and when the first tooth plate 103 moves, the roller 23 will be squeezed, and the oil bag 3 will also contact with the first tooth plate 103 and be squeezed by the first tooth plate 103. After the oil bag 3 is squeezed, the lubricating oil inside will flow out from the third circular holes 32 and reach the surface of the first tooth plate 103, thereby improving the smoothness of the surface of the first tooth plate 103; through the cooperation of the oil bag 3 and the third circular holes 32, after the oil bag 3 is squeezed by the first tooth plate 103, the lubricating oil will flow from the third circular holes 32 to the surface of the first tooth plate 103, thereby realizing the lubrication of the first tooth plate 103 by the device, improving the smoothness of the surface of the first tooth plate 103, and reducing the jamming that occurs when the first tooth plate 103 and the second tooth plate 106 are engaged.

[0028] See also Figure 4As shown, a plurality of bristles 4 are fixedly connected to the middle part of the roller 23; the bristles 4 are arranged in a circular array; when the first tooth plate 103 contacts the roller 23, the first tooth plate 103 will also contact the bristles 4, and the bristles 4 will clean the surface of the first tooth plate 103 when contacting the first tooth plate 103, and at the same time, the bristles 4 will also apply the lubricating oil on the surface of the first tooth plate 103 to improve the uniformity of the lubricating oil on the surface of the first tooth plate 103; by arranging the bristles 4, the bristles 4 will clean the surface of the first tooth plate 103 when contacting the first tooth plate 103, reduce the dust on the surface of the first tooth plate 103, and at the same time, the bristles 4 will also apply the lubricating oil on the surface of the first tooth plate 103 to improve the uniformity of the lubricating oil on the surface of the first tooth plate 103.

[0029] See also Figure 4 As shown, a triangular plate 5 is fixedly connected to the bottom of the first fixed groove 104; the top of the triangular plate 5 is inclined; the triangular plate 5 is located at the bottom of the top plate 22; when the lubricating oil in the oil bag 3 flows from the third circular hole 32 to the surface of the first tooth plate 103, part of the lubricating oil will drip to the bottom of the first fixed groove 104, and the lubricating oil will first reach the surface of the triangular plate 5 and flow along the surface of the triangular plate 5. Because the triangular plate 5 is inclined, the lubricating oil will flow along the surface of the triangular plate 5 to the inside of the slide groove 105, so that the device can lubricate the slide groove 105 and improve the smoothness of the inner wall of the slide groove 105; by setting the triangular plate 5, the triangular plate 5 will make the dripping lubricating oil flow to the inside of the slide groove 105, so that the device can reuse the lubricating oil and lubricate the slide groove 105, improve the utilization rate of the lubricating oil, reduce the pollution of the lubricating oil to the working environment, and also improve the smoothness of the inner wall of the slide groove 105, reducing the jamming when the second tooth plate 106 slides.

[0030] See also Figure 4 As shown, a plurality of fixed plates 6 are fixedly connected to the top of the triangular plate 5; a plurality of fourth circular holes 62 are opened in the middle of the fixed plate 6; when the lubricating oil drips onto the top of the triangular plate 5, the lubricating oil will flow along the triangular plate 5, and the lubricating oil will reach the surface of the fixed plate 6 and flow along the edge of the fixed plate 6. When there is too much lubricating oil on one side of the fixed plate 6, the lubricating oil will also pass through the fourth circular hole 62 to reach the other side of the fixed plate 6; by setting the fixed plate 6, the lubricating oil will flow along the edge of the fixed plate 6 when flowing on the surface of the triangular plate 5, thereby realizing the guidance of the flow trajectory of the lubricating oil by the device, so that the lubricating oil can accurately reach the inside of the slide groove 105, thereby enhancing the lubricating effect of the lubricating oil on the slide groove 105.

[0031] See also Figure 2As shown, a plurality of sponges 7 are rotatably connected on both sides of the first tooth plate 103; the sponges 7 are arranged in an array; when the first tooth plate 103 enters the first fixed groove 104, the sponges 7 will also move with the first tooth plate 103, the sponges 7 will come into contact with the inner wall of the first fixed groove 104 and rotate under the action of friction, the sponges 7 will absorb the dust and lubricating oil attached to the inner wall of the first fixed groove 104, and improve the cleanliness of the inner wall of the first fixed groove 104.

[0032] Working principle: first move the cross plate 108 to make the first spring 107 in a compressed state. When the cross plate 108 moves, the angle of the connecting rod 111 will change. When the angle of the connecting rod 111 changes, it will drive the second tooth plate 106 to move together and make the second tooth plate 106 slide along the slide groove 105. When the second tooth plate 106 is in a suitable position, insert the pin into the second circular hole 110. The pin will penetrate the first circular hole 109 to make the cross plate 108 in a stable state. Then, move the first oil-free slide plate 1 along the first tooth plate 103 to align with the first fixed groove 104 and move toward the second oil-free slide plate 102. When the first oil-free slide plate 1 moves, it will drive the first tooth plate 103 to move together. The first tooth plate 1 When the first oil-free slide plate 102 is moved, it will enter the inside of the first fixed groove 104 and come into contact with the second tooth plate 106. When the first oil-free slide plate 102 is fitted with the second oil-free slide plate 102, the first tooth plate 103 and the second tooth plate 106 will rub against each other. The first tooth plate 103 will transmit the friction force of the second tooth plate 106 to the first oil-free slide plate 1 so that the first oil-free slide plate 1 is in a stationary state. When the first oil-free slide plate 102 needs to be removed, the latch can be pulled out, and the cross plate 108 will be reset under the elastic force of the first spring 107 and the angle of the connecting rod 111 will change. The connecting rod 111 will make the second tooth plate 106 move away from the first tooth plate 103. After the first tooth plate 103 loses the friction force applied by the second tooth plate 106, The first oil-free slide plate 102 is in an active state, at which time the first oil-free slide plate 1 can be pulled out from the middle of the second oil-free slide plate 102; when the first tooth plate 103 enters the first fixed groove 104, it will come into contact with the top plate 22, and when the first tooth plate 103 and the top plate 22 come into contact, they will also come into contact with the roller 23 and cause the roller 23 to rotate, and after the top plate 22 is squeezed by the first tooth plate 103, the pressure will be transmitted to the second spring 2 and the second spring 2 will be in a compressed state, and then the second spring 2 will release the elastic potential energy and apply elastic force to the top plate 22, and the top plate 22 will transmit the elastic force to the roller 23 and cause the roller 23 to squeeze the first tooth plate 103, so that the first tooth plate 103 will be subjected to additional force when moving and stably engage with the second tooth plate 106; when the first tooth plate 103 moves, it will squeeze the roller 23, and the oil bag 3 will also contact with the first tooth plate 103 and be squeezed by the first tooth plate 103. After the oil bag 3 is squeezed, the lubricating oil inside will flow out from the third circular hole 32 and reach the surface of the first tooth plate 103, thereby improving the smoothness of the surface of the first tooth plate 103; when the first tooth plate 103 contacts with the roller 23, the first tooth plate 103 will also contact with the bristles 4, and when the bristles 4 contact with the first tooth plate 103, the surface of the first tooth plate 103 will be cleaned, and at the same time, the bristles 4 will also brush the lubricating oil on the surface of the first tooth plate 103, thereby improving the uniformity of the lubricating oil on the surface of the first tooth plate 103;When the lubricating oil in the oil bag 3 flows from the third circular hole 32 to the surface of the first tooth plate 103, part of the lubricating oil will drip to the bottom of the first fixed groove 104, and the lubricating oil will first reach the surface of the triangle plate 5 and flow along the surface of the triangle plate 5. Because the triangle plate 5 is inclined, the lubricating oil will flow along the surface of the triangle plate 5 to the inside of the slide groove 105, so that the device can lubricate the slide groove 105 and improve the smoothness of the inner wall of the slide groove 105. When the lubricating oil drips to the top of the triangle plate 5, the lubricating oil will flow along the triangle plate 5. , the lubricating oil will reach the surface of the fixing plate 6 and flow along the edge of the fixing plate 6. When there is too much lubricating oil on one side of the fixing plate 6, the lubricating oil will also pass through the fourth circular hole 62 to reach the other side of the fixing plate 6; when the first tooth plate 103 enters the first fixing groove 104, the sponge 7 will also move with the first tooth plate 103, and the sponge 7 will contact the inner wall of the first fixing groove 104 and rotate under the action of friction. The sponge 7 will absorb the dust and lubricating oil attached to the inner wall of the first fixing groove 104, and improve the cleanliness of the inner wall of the first fixing groove 104. ;

[0033] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A combined oil-free slide plate connection structure, comprising a first oil-free slide plate (1), characterized in that: A second oil-free slide plate (102) is provided on one side of the first oil-free slide plate (1); a plurality of first tooth plates (103) are fixedly connected to the ends of the first oil-free slide plate (1) and the second oil-free slide plate (102); a plurality of first fixing grooves (104) are provided at the other ends of the first oil-free slide plate (1) and the second oil-free slide plate (102); the first fixing grooves (104) and the first tooth plates (103) are provided correspondingly; a sliding groove (105) is symmetrically provided on the inner side wall of the first fixing groove (104); the inner side wall of the sliding groove (105) is slidably connected to two second tooth plates ( 106); a first spring (107) is fixedly connected to the inner side wall of the first fixing groove (104); a transverse plate (108) is fixedly connected to the end of the first spring (107); a connecting rod (111) is symmetrically hinged in the middle of the transverse plate (108); the adjacent connecting rods (111) and the second tooth plate (106) are in a hinged relationship; a plurality of first circular holes (109) are opened in the middle of the transverse plate (108); a plurality of second circular holes (110) are opened in the middle of the first oil-free slide plate (1); the first circular holes (109) and the second circular holes (110) are arranged correspondingly.

2. The combined oil-free slide plate connection structure according to claim 1, characterized in that: A plurality of second springs (2) are symmetrically fixed to the inner side wall of the first fixing groove (104); the ends of adjacent second springs (2) are fixed to a top plate (22); a plurality of second fixing grooves (24) are formed in the middle of the top plate (22); and a roller (23) is rotatably connected to the middle of the second fixing groove (24).

3. The combined oil-free slide plate connection structure according to claim 2, characterized in that: A plurality of oil bags (3) are fixedly connected to the middle of the roller (23); a plurality of third circular holes (32) are opened in the middle of the oil bags (3).

4. The combined oil-free slide plate connection structure according to claim 3, characterized in that: A plurality of bristles (4) are fixedly connected to the middle of the roller (23); the bristles (4) are arranged in a circular array.

5. The combined oil-free slide plate connection structure according to claim 4, characterized in that: A triangular plate (5) is fixedly connected to the bottom of the first fixing groove (104); the top of the triangular plate (5) is arranged at an angle; and the triangular plate (5) is located at the bottom of the top plate (22).

6. The combined oil-free slide plate connection structure according to claim 5, characterized in that: A plurality of fixing plates (6) are fixedly connected to the top of the triangular plate (5); a plurality of fourth circular holes (62) are opened in the middle of the fixing plate (6).

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