Three-position switch and circuit breaker interlocking mechanism and switch cabinet

Abstract

The utility model relates to the field of interlocking or locking of switching devices, in particular to a three-position switch and circuit breaker interlocking mechanism and a switch cabinet. The three-position switch and circuit breaker interlocking mechanism and the switch cabinet are used for solving the problems of complex structure and tedious installation of an interlocking mechanism in the prior art. The three-position switch and circuit breaker interlocking mechanism comprises an interlocking shifting plate and an interlocking plate in transmission connection with the interlocking shifting plate, the interlocking shifting plate is perpendicular to the interlocking plate, the three-position switch and circuit breaker interlocking mechanism further comprises a positioning guide frame, and a transverse guide structure for guiding the interlocking shifting plate and a longitudinal guide structure for guiding the interlocking plate are arranged on the positioning guide frame. The positioning guide frame is provided with a connecting structure used for being fixedly connected with the switch cabinet. The positioning guide frame is used for guiding and positioning installation of the interlocking shifting plate and the interlocking plate at the same time, so that the interlocking shifting plate and the interlocking plate integrally form an interlocking module, then the positioning guide frame is directly installed at a preset position on the switch cabinet, installation is simple, deployment is convenient, and the installation cost is saved.

Description

Technical Field

[0001] The utility model relates to the interlocking or locking field of a switch device, in particular to an interlocking mechanism of a three-position switch and a circuit breaker and a switch cabinet. Background Art

[0002] In the power transmission and distribution system, the three-position disconnector in the high-voltage switchgear is often used in conjunction with the operating mechanism of the circuit breaker. The three-position switch and the circuit breaker must be operated in a fixed operating sequence to ensure the safety of the operation process. When the disconnector and the grounding switch are in action, the circuit breaker cannot be closed. When the circuit breaker is closed, the three-position mechanism cannot be isolated or grounded. Therefore, the circuit breaker and the disconnector need to have corresponding interlocking functions.

[0003] The Chinese utility model patent with authorization announcement number CN212258241U discloses an interlocking device for an environmental protection cabinet mechanism with isolation. The interlocking device for an environmental protection cabinet mechanism with isolation has a three-position operation panel and an interlocking dial plate. When the interlocking dial plate moves, it can be switched to the isolation operation position, the intermediate operation position or the grounding operation position. The horizontally placed interlocking dial plate has a triangular groove, which cooperates with the fasteners on the interlocking plate. When the interlocking dial plate moves, the fasteners on the interlocking plate move along the groove wall, driving the interlocking plate to move up and down. A circuit breaker closing switch, i.e., a circuit breaker closing button, is provided on the movement trajectory of the interlocking plate. The interlocking plate moves up and down to cover or expose the circuit breaker closing button. When the interlocking plate is located in the middle operation position, the fastener is located at the lowest point of the triangular groove wall of the interlocking plate, and the interlocking plate does not block the circuit breaker closing button, so the closing operation can be performed; when the interlocking plate moves to the right to the isolation operation position, the fastener moves obliquely upward along the groove wall on the interlocking plate to drive the interlocking plate to move upward, and the interlocking plate moves upward to block the circuit breaker closing button, so the closing operation cannot be performed; when the interlocking plate moves to the left to the grounding operation position, the fastener moves obliquely upward along the groove wall on the interlocking plate to drive the interlocking plate to move upward, and the interlocking plate moves upward to block the circuit breaker closing button, so the closing operation cannot be performed. The interlocking plate and the interlocking plate are each provided with a waist-shaped hole, which is guided by the cooperation with the guide column on the three-station operation panel. At the same time, the interlocking plate groove and the fastener on the interlocking plate rely on the tension of the tension spring to make the two cooperate. There are many parts and components, and each component needs to be installed and adjusted during installation. The installation is cumbersome and the structure is complex, which increases the installation cost. Utility Model Content

[0004] The purpose of the utility model is to provide a three-position switch and circuit breaker interlocking mechanism to solve the problem that the interlocking mechanism in the prior art is complex in structure, cumbersome in installation, and increases the installation cost. The purpose of the utility model is also to provide a switch cabinet to solve the problem that the interlocking mechanism in the prior art is complex in structure, cumbersome in installation, and increases the installation cost.

[0005] In order to solve the above technical problems, the utility model discloses a three-position switch and circuit breaker interlocking mechanism for a switch cabinet, comprising an interlocking plate and an interlocking plate transmission-connected to the interlocking plate, wherein the interlocking plate and the interlocking plate are arranged vertically, and the interlocking mechanism also comprises a positioning guide frame, on which a transverse guiding structure for guiding the interlocking plate and a longitudinal guiding structure for guiding the interlocking plate are provided, and the positioning guide frame has a connecting structure for fixedly connecting to the switch cabinet.

[0006] The utility model aims to improve the problem that the interlocking mechanism in the prior art is complicated in structure and installation, which increases the installation cost. By providing a positioning guide frame for guiding the interlocking plate and the interlocking dial plate at the same time, the interlocking dial plate and the interlocking plate can be installed on the positioning guide frame as a whole during installation. The relative position of the interlocking dial plate and the interlocking plate can be determined to form an interlocking module as a whole. The positioning guide frame can then be directly installed at a predetermined position on the switch cabinet. The installation is simple and the deployment is convenient, which saves installation cost.

[0007] Further, the positioning guide frame includes a laterally extending U-shaped frame, the positioning guide frame includes a laterally extending U-shaped frame, the longitudinal guide structure is a longitudinal guide groove correspondingly arranged on two laterally extending parallel walls of the U-shaped frame, a longitudinally extending guide vertical plate is arranged on the laterally extending wall of the U-shaped frame, and the transverse guide structure is a transverse guide groove arranged on the guide vertical plate.

[0008] Furthermore, the interlocking shift plate and the interlocking plate are connected in transmission via an articulated connecting rod which is respectively articulated to both of them.

[0009] Furthermore, there are two guide vertical plates, which are located at both ends of the longitudinal guide groove, and the longitudinal guide groove is located in the middle of the transversely extending wall of the U-shaped frame.

[0010] Furthermore, the guide vertical plate is arranged above the wall surface extending transversely of the U-shaped frame, and the transverse guide groove is an open groove with its opening facing upward.

[0011] Correspondingly, the second aspect of the embodiment of the utility model provides a switch cabinet, which has a cabinet body, a three-position switch and a circuit breaker interlocking mechanism, wherein the three-position switch and circuit breaker interlocking mechanism includes an interlocking dial and an interlocking plate transmission-connected to the interlocking dial, the interlocking dial and the interlocking plate are vertically arranged, and the interlocking mechanism also includes a positioning guide frame, on which a transverse guide structure for guiding the interlocking dial and a longitudinal guide structure for guiding the interlocking plate are provided, and the positioning guide frame has a connection structure for fixedly connecting to the switch cabinet.

[0012] The utility model aims to improve the problem that the interlocking mechanism in the prior art is complicated in structure and installation, which increases the installation cost. By providing a positioning guide frame for guiding the interlocking plate and the interlocking dial plate at the same time, the interlocking dial plate and the interlocking plate can be installed on the positioning guide frame as a whole during installation. The relative position of the interlocking dial plate and the interlocking plate can be determined to form an interlocking module as a whole. The positioning guide frame can then be directly installed at a predetermined position on the switch cabinet. The installation is simple and the deployment is convenient, which saves installation cost.

[0013] Further, the positioning guide frame includes a laterally extending U-shaped frame, the positioning guide frame includes a laterally extending U-shaped frame, the longitudinal guide structure is a longitudinal guide groove correspondingly arranged on two laterally extending parallel walls of the U-shaped frame, a longitudinally extending guide vertical plate is arranged on the laterally extending wall of the U-shaped frame, and the transverse guide structure is a transverse guide groove arranged on the guide vertical plate.

[0014] Furthermore, the interlocking shift plate and the interlocking plate are connected in transmission via an articulated connecting rod which is respectively articulated to both of them.

[0015] Furthermore, there are two guide vertical plates, which are located at both ends of the longitudinal guide groove, and the longitudinal guide groove is located in the middle of the transversely extending wall of the U-shaped frame.

[0016] Furthermore, the guide vertical plate is arranged above the wall surface extending transversely of the U-shaped frame, and the transverse guide groove is an open groove with its opening facing upward. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the three-position switch of the utility model, the circuit breaker interlocking mechanism and the circuit breaker closing buckle plate cooperating in the grounding operation position;

[0018] Figure 2 It is a schematic diagram of the structure of the three-position switch of the utility model in cooperation with the circuit breaker interlocking mechanism, the circuit breaker frame, the three-position operation panel and the circuit breaker closing buckle plate in the grounding operation position;

[0019] Figure 3 It is a schematic diagram of the structure of the three-position switch of the utility model, the circuit breaker interlocking mechanism, the three-position operation panel and the circuit breaker closing buckle plate in the grounding operation position;

[0020] Figure 4 for Figure 3 Side view of

[0021] Figure 5 It is a structural schematic diagram of the three-position switch of the utility model, the circuit breaker interlocking mechanism, the three-position operation panel and the circuit breaker closing buckle plate in the isolation operation position;

[0022] Figure 6 for Figure 5 Side view of

[0023] Figure 7 It is a structural schematic diagram of the three-position switch of the utility model, the circuit breaker interlocking mechanism, the three-position operation panel and the circuit breaker closing plate in the middle operation position;

[0024] Figure 8 for Figure 7 Side view of

[0025] Fig. 9 It is a side view of the utility model's three-position switch, circuit breaker interlocking mechanism and circuit breaker closing buckle plate in the middle operating position with the circuit breaker closed;

[0026] Fig.10 It is a schematic diagram of the positioning guide frame of the interlocking mechanism of the three-position switch and the circuit breaker of the utility model;

[0027] Fig.11 It is a structural schematic diagram of the closing buckle plate of the three-position switch and circuit breaker interlocking mechanism of the utility model;

[0028] Fig.12 It is a schematic diagram of the hinged connecting rod of the interlocking mechanism of the three-position switch and the circuit breaker of the utility model;

[0029] Fig.13 It is a schematic diagram of the interlocking plate of the interlocking mechanism of the three-position switch and the circuit breaker of the utility model;

[0030] Fig.14 The utility model is a schematic diagram of the interlocking plate of the three-position switch and the circuit breaker interlocking mechanism.

[0031] In the figure: 1. circuit breaker frame, 2. three-position mechanism operation panel, 3. interlocking plate, 4. hinged connecting rod, 5. interlocking plate, 6. positioning guide frame, 7. reset elastic member, 8. operating handle, 9. circuit breaker closing buckle plate, 10. grounding operation hole, 11. isolation operation hole, 12. offset hole, 13. rotating shaft, 14. rotating plate, 15. locking boss, 16. hinge hole, 17. hinge shaft, 18. reset elastic member connecting hole, 19 trapezoidal boss, 20. transverse guide groove, 21. longitudinal guide groove, 22. guide vertical plate, 23. connecting hole. DETAILED DESCRIPTION

[0032] The prior art discloses an environmental protection cabinet mechanism interlocking device with isolation, wherein the environmental protection cabinet mechanism interlocking device with isolation has an interlocking dial plate and an interlocking plate. The interlocking dial plate is placed horizontally, and the interlocking plate is placed vertically. The horizontally placed interlocking dial plate has a triangular groove, and the triangular groove cooperates with the fastener on the interlocking plate. When the interlocking dial plate moves, the fastener on the interlocking plate moves along the groove wall, driving the interlocking plate to move up and down. A circuit breaker closing switch, i.e., a circuit breaker closing button, is provided on the movement trajectory of the interlocking plate. The interlocking plate moves up and down to cover or expose the circuit breaker closing button. The interlocking dial plate and the interlocking plate are each provided with a waist-shaped hole, and the guided movement is achieved by cooperating with the guide column on the three-station operation panel. At the same time, the interlocking dial plate groove and the fastener on the interlocking plate rely on the tension of the tension spring to make the two cooperate. Each component needs to be installed and deployed during installation, which is cumbersome to install and complex in structure, increasing the installation cost.

[0033] The present invention proposes a technical solution to the problems existing in the above-mentioned technical solutions. The core concept of the present invention is: a positioning guide frame is provided for guiding the interlocking plate and the interlocking dial plate at the same time, the positioning guide frame has a connection structure for fixed connection with the switch cabinet, and by providing the positioning guide frame for guiding the interlocking plate and the interlocking dial plate at the same time, during installation, the interlocking dial plate and the interlocking plate can be installed on the positioning guide frame as a whole, and the relative position of the interlocking dial plate and the interlocking plate can be determined to form an interlocking module as a whole, and then the positioning guide frame can be directly installed at a predetermined position on the switch cabinet, which is simple to install and easy to deploy, saving installation costs.

[0034] Based on the above utility model concept, the embodiment of the utility model three-position switch and circuit breaker interlocking mechanism is as follows Figure 3 , Figure 5 , Figure 7 As shown, the interlocking plate 3 is arranged horizontally, the interlocking plate 5 is arranged vertically, the three-station operation panel 2 is provided with a grounding operation hole 10 and an isolation operation hole 11, and the interlocking plate 3 is provided with Figure 1 The offset hole 12, the grounding operation hole 10 and the isolation operation hole 11 are located on the movement track of the offset hole 12 on the interlocking plate 3. The interlocking plate 3 is connected to the interlocking plate 5 in a transmission manner. The moving path of the interlocking plate 5 is provided with a Fig.11 The circuit breaker closing plate 9 shown in the figure has a rotating shaft 13, on which a rotating plate 14 and a locking boss 15 are arranged. When the interlocking plate 3 is guided to move to switch the working position by manually pulling the operating handle 8, the interlocking plate 3 drives the interlocking plate 5 to guide and move to block or avoid the circuit breaker closing plate. When the interlocking plate 3 is in the middle operating position, as shown in FIG. Figure 7 , Figure 8As shown in FIG. 1 , the offset hole 12 is located between the grounding operation hole 10 and the isolation operation hole 11, and the interlocking plate 3 blocks the grounding operation hole 10 and the isolation operation hole 11, so that the isolation or grounding operation cannot be realized. At the same time, the interlocking plate 5 is raised, and the circuit breaker closing plate 9 can be rotated. When the circuit breaker is closed, Fig. 9 As shown in the figure, the locking boss 15 of the closing buckle plate 9 of the circuit breaker rotates to the bottom of the interlocking plate 5, and supports the interlocking plate 5, so that the interlocking plate 5 cannot move downward, thereby restricting the movement of the interlocking plate 3, thereby achieving the interlocking of the three-position switch mechanism and the circuit breaker mechanism; when the interlocking plate 3 is in the grounding operation position, as shown in the figure, Figure 3 , Figure 4 As shown, the offset hole 12 coincides with the grounding operation hole 10, so that the operating handle can be inserted to perform the grounding operation, and at the same time, the interlocking plate 5 is driven to lower and block the circuit breaker closing plate 9 from rotating; when the interlocking plate 3 is in the isolation operation position, as shown in FIG. Figure 5 , Figure 6 As shown, the offset hole 12 overlaps with the isolation operation hole 11, so that the operating handle can be inserted to perform the isolation operation. At the same time, the interlocking plate 5 is lowered to prevent the circuit breaker closing buckle plate 9 from rotating.

[0035] The three-position switch and circuit breaker interlocking mechanism also includes a positioning guide frame 6, which is provided with a transverse guiding structure for guiding the interlocking plate 3 and a longitudinal guiding structure for guiding the interlocking plate 5. The positioning guide frame has a connection structure for fixedly connecting with the switch cabinet. A connection hole 23 is provided at the bottom of the positioning connection frame, and the connection hole is connected with the Figure 2 The interlocking plate and the interlocking plate are guided and installed at the same time by a positioning guide frame, so that the interlocking plate and the interlocking plate form a modular structure as a whole, which is easy to install and saves installation costs.

[0036] A reset elastic member is connected between the positioning guide frame and the interlocking plate. The use of the reset elastic member can accurately return the interlocking mechanism to the intermediate operating position, and the process is simple and efficient. In this embodiment, a reset tension spring 7 is used. When the spring is deformed, it accumulates elastic potential energy and releases the elastic potential energy when it is reset. One end of the reset tension spring 7 is connected to the positioning guide frame 6, and the other end is connected to the reset elastic member connection hole 18 on the interlocking plate 5. When the interlocking plate is in the position as shown in the figure, the reset spring 7 is connected to the positioning guide frame 6 ... Figure 3 , Figure 5When the reset spring 7 is in the grounding operation position or the isolation operation position shown, the reset spring 7 is stretched to produce deformation. When the reset spring 7 is reset, the reset spring 7 relies on its internal elastic force to pull the interlocking plate upward to achieve vertical overlap between the interlocking plate 5 and the hinged connecting rod 4, and the interlocking plate returns to the middle operation position. In addition, in other embodiments, a two-way reset torsion spring can be used, and the two-way reset torsion spring is placed at the connection between the hinged connecting rod and the interlocking plate, one end of which is connected to the interlocking plate, and the other end is connected to the hinged connecting rod. When the interlocking plate is in the grounding operation position and the isolation operation position, the two-way reset torsion spring produces rotational deformation along its axial direction to store torsional potential energy. When the two-way reset torsion spring is reset, the torsional potential energy stored in the two-way reset torsion spring is relied on to achieve the reset of the interlocking device. A reset compression spring can also be used. One end of the reset compression spring is connected to the transversely extending wall of the lower part of the positioning guide frame through a compression spring seat, and the compression spring seat at the other end is connected to the interlocking plate. When the interlocking plate is in the grounding operating position and the isolation operating position, the interlocking plate is lowered and the compression spring is elastically deformed under pressure. When the operating handle is released, the elastic force stored in the reset compression spring pushes the interlocking plate up, so that the chain mechanism returns to the middle operating position.

[0037] In this embodiment, the positioning guide frame 6 includes: Fig.10 The U-shaped frame extending transversely shown, the longitudinal guide structure is a longitudinal guide groove 21 correspondingly arranged on two parallel walls extending transversely of the U-shaped frame, the wall extending transversely of the U-shaped frame is provided with a longitudinally extending guide vertical plate 22, and the transverse guide structure is a transverse guide groove 20 arranged on the guide vertical plate 22. The interlocking plate and the interlocking plate are guided by a guide frame at the same time, which simplifies the structure of the interlocking module, makes the installation simple, and saves costs. In addition, in other embodiments, a T-shaped frame can be used, and a guide groove or a longitudinally extending guide vertical plate is arranged on the transversely extending plane of the T-shaped frame, and an opening groove with an opening upward is opened on the guide vertical plate, and a guide groove is arranged on the longitudinally extending plane of the T-shaped frame, and the guide positioning of the interlocking plate and the interlocking plate in two directions is realized by the T-shaped guide structure.

[0038] In this embodiment, the interlocking plate 5 and the interlocking plate 3 are connected to each other through an articulated connecting rod 4 which is respectively connected to the two. Fig.12 The hinge holes 16 shown in the figure are respectively connected to the hinge holes 16 at both ends. Fig.13 , Fig.14The interlocking plate 3 is shown to be hinged to the hinge shaft 17 on the interlocking plate 5. When the interlocking plate 3 is in the middle operating position, the hinged connecting rod 4 and the interlocking plate 5 overlap in the vertical direction, and the interlocking plate is raised; when the interlocking plate 3 is in the grounding operating position, the hinged connecting rod 4 and the interlocking plate 5 are set as the left triangle hypotenuse, and the interlocking plate 5 is lowered; when the interlocking plate 3 is in the isolation operating position, the hinged connecting rod 4 and the interlocking plate 5 are set as the right triangle hypotenuse, and the interlocking plate 5 is lowered. By hingedly connecting the interlocking plate, the interlocking plate, and the hinged connecting rod, the transmission between the three is mutually restricted, so as to improve the reliability of the interlocking device. In addition, in other embodiments, as shown in Example 2 of the Chinese utility model patent with authorization announcement number CN212258241U, a triangular groove is provided on the interlocking plate, and a fastener is provided on the interlocking plate. When the interlocking plate moves left and right, the fastener moves along the groove wall of the triangular groove on the interlocking plate to drive the interlocking plate to move up and down, and the transmission of the interlocking plate and the interlocking plate is realized through the cooperation of the fastener and the groove wall.

[0039] In this embodiment, there are two guide vertical plates 22, which are located at both ends of the longitudinal guide groove 21, and the longitudinal guide groove 21 is located in the middle of the transversely extending wall of the U-shaped frame. In this way, when the interlocking plate 3 is switched to the isolation operation position and the grounding operation position, the position of the hinged connecting rod 4 is symmetrical with the interlocking plate 5 as the center, saving the three-dimensional space for the interlocking mechanism to switch the operation position. In addition, in other embodiments, the number of guide vertical plates can be set to be multiple, as long as it does not affect the switching position of the interlocking mechanism.

[0040] In this embodiment, the guide plate is arranged above the wall surface of the U-shaped frame extending transversely, and the transverse guide groove is an open groove with the opening facing upward. In addition, in other embodiments, the guide plate can be arranged below the U-shaped frame extending transversely, and the transverse guide groove is a closed slot hole arranged on the guide plate to meet the interlocking arrangement that the closing plate is located on the upper running track of the interlocking plate, and the interlocking plate is located on the lower running track of the interlocking plate.

[0041] Embodiment of the switch cabinet in the utility model:

[0042] In this embodiment, the switch cabinet includes a cabinet body and a three-position switch and circuit breaker interlocking mechanism installed on the cabinet body. Since the switch cabinet adopts all embodiments of the three-position switch mechanism and circuit breaker mechanism interlocking device, it has all the beneficial effects of the three-position switch mechanism and circuit breaker mechanism interlocking device, which are not described one by one here.

Claims

1. The interlocking mechanism of the three-position switch and the circuit breaker comprises an interlocking plate and an interlocking plate connected to the interlocking plate in a transmission manner, wherein the interlocking plate and the interlocking plate are arranged vertically, and the characteristics are as follows: The interlocking mechanism also includes a positioning guide frame, on which a transverse guiding structure for guiding the interlocking plate and a longitudinal guiding structure for guiding the interlocking plate are provided. The positioning guide frame has a connecting structure for fixedly connecting with the switch cabinet.

2. The three-position switch and circuit breaker interlocking mechanism according to claim 1 is characterized in that: The positioning guide frame includes a laterally extending U-shaped frame, the longitudinal guide structure is a longitudinal guide groove correspondingly arranged on two laterally extending parallel walls of the U-shaped frame, a longitudinally extending guide vertical plate is arranged on the laterally extending wall of the U-shaped frame, and the transverse guide structure is a transverse guide groove arranged on the guide vertical plate.

3. The three-position switch and circuit breaker interlocking mechanism according to claim 2 is characterized in that: The interlocking plate and the interlocking plate are connected to each other through hinged connecting rods which are respectively hinged to the two plates to achieve transmission connection.

4. The three-position switch and circuit breaker interlocking mechanism according to claim 3 is characterized in that: There are two guide vertical plates, which are located at both ends of the longitudinal guide groove, and the longitudinal guide groove is located in the middle of the transversely extending wall of the U-shaped frame.

5. The three-position switch and circuit breaker interlocking mechanism according to claim 2, 3 or 4, characterized in that: The guide vertical plate is arranged above the wall surface extending transversely of the U-shaped frame, and the transverse guide groove is an open groove with its opening facing upward.

6. A switch cabinet, comprising a cabinet body and a three-position switch and a circuit breaker interlocking mechanism mounted on the cabinet body, characterized in that: The three-position switch and circuit breaker interlocking mechanism includes an interlocking plate and an interlocking plate transmission-connected to the interlocking plate. The interlocking plate and the interlocking plate are vertically arranged. The interlocking mechanism also includes a positioning guide frame. The positioning guide frame is provided with a transverse guiding structure for guiding the interlocking plate and a longitudinal guiding structure for guiding the interlocking plate. The positioning guide frame has a connecting structure for fixedly connecting to the switch cabinet.

7. The switch cabinet according to claim 6, characterized in that: The positioning guide frame includes a laterally extending U-shaped frame, the longitudinal guide structure is a longitudinal guide groove correspondingly arranged on two laterally extending parallel walls of the U-shaped frame, a longitudinally extending guide vertical plate is arranged on the laterally extending wall of the U-shaped frame, and the transverse guide structure is a transverse guide groove arranged on the guide vertical plate.

8. The switch cabinet according to claim 7, characterized in that: The interlocking plate and the interlocking plate are connected to each other through hinged connecting rods which are respectively hinged to the two plates to achieve transmission connection.

9. The switch cabinet according to claim 8, characterized in that: There are two guide vertical plates, which are located at both ends of the longitudinal guide groove, and the longitudinal guide groove is located in the middle of the transversely extending wall of the U-shaped frame.

10. The switch cabinet according to claim 7, 8 or 9, characterized in that: The guide vertical plate is arranged above the wall surface extending transversely of the U-shaped frame, and the transverse guide groove is an open groove with its opening facing upward.

Images