Power distribution cabinet with fixing structure

Abstract

The application relates to the technical field of power transmission and distribution equipment, in particular to a power transmission and distribution cabinet with a fixing structure, which comprises a base, a buried base under the base and a vertical fixed motor cabinet body at the top end of the base, a cabinet door is hinged on one side of the motor cabinet body, a switch assembly is fixed on one side of the middle part of the cabinet door, a limiting assembly is fixed at the position corresponding to the switch assembly on the inner side of the motor cabinet body, the limiting assembly comprises a fixed shell fixed at the position on the inner side of the motor cabinet body, a plurality of moving holes are uniformly distributed on the inner side of a semi-arc-shaped fixed block surrounding the fixed shell, and an elastic telescopic rod is fixed in the inner side of the moving hole; through the cooperation of the switch assembly and the limiting assembly, the cabinet door can be firmly fixed on the motor cabinet body, the situation that the cabinet door is not closed due to personal negligence can be avoided, the sealing performance after being closed is guaranteed, the internal components are protected, and through the use of the fastening assembly, installation and dismounting are facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of power transmission and distribution equipment, in particular to a power transmission and distribution cabinet with a fixed structure. Background Art

[0002] Both transmission and distribution facilities include substations, lines, and other equipment. All transmission equipment is connected to form the transmission network. The network of distribution equipment between the transmission network and consumers is called the distribution network. These are sometimes referred to as the transmission system and distribution system. The transmission and distribution systems, along with power plants and consumer equipment, are collectively referred to as the power system. Various electrical equipment within a power system has its own rated voltage, which together form the voltage hierarchy of the entire power system. Transmission uses a higher voltage than distribution. The boundary between transmission and distribution voltages is not fixed and varies depending on the area covered and the capacity of the power grid.

[0003] During use, the following problems still exist:

[0004] Sometimes the cabinet door is closed directly without checking whether it is closed, resulting in it not being closed tightly. Dust may enter the components inside the cabinet, causing a short circuit in the internal components, which in turn affects normal use. Summary of the Invention

[0005] In view of the above problems or the problems mentioned in the background art in the prior art, the present invention is proposed.

[0006] Therefore, an object of the present invention is to provide a transmission and distribution cabinet with a fixed structure.

[0007] To solve the above technical problems, the present invention provides the following technical solutions: a transmission and distribution motor cabinet with a fixed structure, comprising a base, a buried base below the base, and a motor cabinet body vertically fixed to the top of the base, a cabinet door hingedly connected to one side of the motor cabinet body, a switch assembly fixed to one side of the middle of the cabinet door, and a limit assembly fixed to the inside of the motor cabinet body at a position corresponding to the switch assembly;

[0008] Among them, the limit assembly includes a fixed shell fixed at the inner position of the motor cabinet, and movable holes are evenly distributed on the inner side of the fixed shell around the semi-arc-shaped fixed block. An elastic telescopic rod is fixed on the inner side of the movable hole, and a card block for the limit switch assembly is fixed at the end of the elastic telescopic rod; the switch assembly is inserted into the card block for closing the cabinet door.

[0009] As a preferred solution of the power transmission and distribution cabinet with a fixed structure of the present invention, the switch assembly includes a fixed seat fixed on one side of the middle part of the cabinet door, a rotating block is hinged on the fixed seat, a handle is vertically fixed to the middle of the bottom end of the rotating block, a moving groove is provided on one side of the middle part of the cabinet door between the fixed seats, and a limiting groove is provided on the fixed seat and the moving groove for limiting the movement of the rotating block, a moving rod corresponding to the position between the fixed seats is slidably connected inside the cabinet door, a reset spring is connected between the outer side of the moving rod and the inner side of the cabinet door, a semi-arc fixed block is vertically fixed to the end of the moving rod away from the rotating block, and a semi-arc moving block with a limiting block is slidably connected to the outer side of the moving rod near the position of the semi-arc fixed block.

[0010] As a preferred solution of the power transmission and distribution cabinet with a fixed structure of the present invention, a protrusion is fixed on one end of the upper portion of the fixing seat close to the movable groove, and a notch is opened at a corresponding position on the upper portion of the movable rod.

[0011] As a preferred solution of the power transmission and distribution cabinet with a fixed structure of the present invention, wherein: both sides of the base are provided with bayonets, and a fastening component for clamping the bayonets is provided in the buried base.

[0012] As a preferred solution of the power transmission and distribution cabinet with a fixed structure of the present invention, the fastening assembly includes a placement groove opened in the buried base, a U-shaped connecting plate is slidably connected inside the placement groove, and a clamping groove is symmetrically opened in the middle of both sides of the U-shaped connecting plate, an extrusion spring is vertically fixed to the middle of the top of the U-shaped connecting plate, a top column is fixed to the top of the extrusion spring, and a middle rotating plate is connected between the two sides of the lower part of the top column and the clamping groove, the middle part of the middle rotating plate is connected to the placement groove through a rotating shaft, and a clip is hinged on both sides of the top of the buried base, the top of the clip is clamped in the clip, and a connecting plate is connected between one side of the middle of the clip and the top of the U-shaped connecting plate.

[0013] As a preferred solution of the power transmission and distribution cabinet with a fixed structure of the present invention, a placement groove is provided in the middle of the top end of the top column.

[0014] As a preferred solution of the power transmission and distribution cabinet with a fixed structure of the present invention, a cylinder in contact with the placement slot is vertically fixed to the middle of the bottom end of the base.

[0015] As a preferred solution of the power transmission and distribution cabinet with a fixed structure of the present invention, the limit assembly further includes a button arranged at one end of the inner side of the fixed shell, and the output end of the button is connected to the input end of the cylinder.

[0016] As a preferred solution of the transmission and distribution motor cabinet with a fixed structure of the present invention, a heat dissipation window is provided inside the motor cabinet, and a heat conducting plate is built into the heat dissipation window.

[0017] As a preferred solution of the power transmission and distribution cabinet with a fixed structure of the present invention, a lock for limiting the rotation of the rotating block is provided on the limiting groove.

[0018] The beneficial effects of the power transmission and distribution cabinet with a fixed structure of the present invention are as follows: through the coordinated use of the switch assembly and the limit assembly, the cabinet door can be firmly fixed on the motor cabinet body, and the situation where the cabinet door is not closed due to personal negligence will not occur. The internal sealing is guaranteed after closing to protect the internal components, and the use of the fastening assembly facilitates installation and disassembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 The figure is a schematic diagram of the three-dimensional structure of a power transmission and distribution cabinet with a fixed structure.

[0021] Figure 2 This is a schematic diagram of the connection between the switch assembly and the limit assembly of a power transmission and distribution cabinet with a fixed structure.

[0022] Figure 3 The diagram is a structural diagram of a switch assembly for a power transmission and distribution cabinet with a fixed structure.

[0023] Figure 4 It is a side view of a transmission and distribution cabinet with a fixed structure.

[0024] Figure 5 A transmission and distribution cabinet with a fixed structure Figure 4 Cross-sectional view along AA.

[0025] Figure 6 The diagram is a connection diagram of a transmission and distribution cabinet base with a fixed structure, a buried base and a fastening component.

[0026] Figure 7 The figure is a structural diagram of a fastening assembly of a power transmission and distribution cabinet with a fixed structure.

[0027] Label:

[0028] 100, base; 101, bayonet; 200, buried base; 300, motor cabinet;

[0029] 400, fastening assembly; 401, placement slot; 402, U-shaped connecting plate; 403, slot; 404, extrusion spring; 405, top column; 406, middle rotating plate; 407, buckle; 408, connecting plate;

[0030] 500, cylinder;

[0031] 600, cabinet door;

[0032] 700, switch assembly; 701, fixed seat; 702, rotating block; 703, handle; 704, moving slot; 705, limit slot; 706, moving rod; 707, return spring; 708, semi-arc fixed block; 709, semi-arc moving block;

[0033] 800, limit assembly; 801, fixed shell; 802, movable hole; 803, elastic telescopic rod; 804, card block; 805, button. DETAILED DESCRIPTION

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0035] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0036] Secondly, the term "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in various places throughout this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive of other embodiments.

[0037] Example 1, reference Figure 1 、 Figure 2 and Figure 3, which is the first embodiment of the present invention, provides a transmission and distribution motor cabinet with a fixed structure, aiming to solve the problem that sometimes the cabinet door 600 is directly closed without checking whether it is closed, resulting in the cabinet door not being closed tightly, and dust entering the components inside the cabinet, causing short circuits in the internal components, thereby affecting normal use. The cabinet comprises a base 100, a buried base 200 below the base 100, and a motor cabinet 300 vertically fixed to the top of the base 100. A cabinet door 600 is hinged on one side of the motor cabinet 300 for closing the motor cabinet 300. A switch assembly 700 is fixed to one side of the middle of the cabinet door 600. A limit assembly 800 is fixed on the inner side of the motor cabinet 300 at a position corresponding to the switch assembly 700.

[0038] Among them, the limiting component 800 includes a fixed shell 801 fixed at the inner side of the motor cabinet 300, which is used for the installation and protection of components. The inner side of the fixed shell 801 is evenly distributed with movable holes 802 around the semi-arc-shaped fixed block 708, which is used to fix the elastic telescopic rod 803. The elastic telescopic rod 803 is fixed on the inner side of the movable hole 802, and the end of the elastic telescopic rod 803 is fixed with a card block 804 for limiting the semi-arc-shaped fixed block 708; the switch component 700 is inserted into the card block 804 for closing the cabinet door 600.

[0039] During use, when the cabinet door 600 rotates toward the motor cabinet 300, the switch assembly 700 contacts the block 804, the switch assembly 700 squeezes the block 804, and the elastic telescopic rod 803 retracts and contracts. After the switch assembly 700 passes through the block 804, the block 804 returns to its original position under the elastic reset of the elastic telescopic rod 803, so that the block 804 plays the role of limiting the switch assembly 700, thereby firmly fixing the cabinet door 600 on the motor cabinet 300, and the cabinet door 600 will not be closed due to personal negligence.

[0040] Furthermore, the switch assembly 700 includes a fixed seat 701 fixed to one side of the middle of the cabinet door 600, a rotating block 702 is hinged on the fixed seat 701, and a handle 703 is vertically fixed to the middle of the bottom end of the rotating block 702, and the handle 703 is used to rotate the rotating block 702. A moving groove 704 is provided between the fixed seat 701 on one side of the middle of the cabinet door 600. The size of the moving groove 704 is larger than the size of the rotating block 702, which is convenient for the entry of the rotating block 702. A limiting groove 705 for limiting the movement of the rotating block 702 is provided on the fixed seat 701 and the moving groove 704. After the rotating block 702 rotates, it enters the moving groove 704 through the limiting groove 705. The interior of the cabinet door 600 is connected with a corresponding fixed seat 701 through a sliding connection. 01, the use of the moving rod 706 facilitates the fixation of the semi-arc fixed block 708 and the sliding setting of the semi-arc moving block 709. A reset spring 707 is connected between the outer side of the moving rod 706 and the inner side of the cabinet door 600, which facilitates the moving rod 706 to return to its original position after use. The end of the moving rod 706 away from the rotating block 702 is vertically fixed with a semi-arc fixed block 708, which is used to push open the card block 804. The outer side of the moving rod 706 is slidably connected with a semi-arc moving block 709 with a limiting block near the semi-arc fixed block 708. The contact between the semi-arc moving block 709 and the semi-arc fixed block 708 can release the restriction of the semi-arc fixed block 708 on the card block 804.

[0041] Furthermore, a protrusion is fixed on one end of the upper portion of the fixing seat 701 close to the movable groove 704 , which can increase the contact length of the fixing seat 701 , and a notch is provided at a corresponding position on the upper portion of the movable rod 706 .

[0042] Furthermore, a lock is provided on the limiting groove 705 for limiting the rotation of the rotating block 702 so as to facilitate locking and fixing.

[0043] Example 2, reference Figures 1 to 7 This is the second embodiment of the present invention. Different from the previous embodiment, it aims to solve the problem of inconvenient installation of the power transmission and distribution cabinet. This embodiment provides a base 100 with bayonet holes 101 on both sides, and a fastening component 400 for clamping the bayonet holes 101 is provided in the buried base 200.

[0044] The base 100 is directly placed on the buried base 200 , and the fastening assembly 400 is directly clamped on the bayonet 101 , which is convenient for installation and fixation.

[0045] Furthermore, the fastening assembly 400 includes a placement groove 401 provided in the buried base 200 to facilitate the placement of the remaining components. A U-shaped connecting plate 402 is slidably connected inside the placement groove 401. A card slot 403 is symmetrically provided in the middle of both sides of the U-shaped connecting plate 402 for connecting the middle rotating plate 406. An extrusion spring 404 is vertically fixed to the middle of the top of the U-shaped connecting plate 402 for restoring the position of the top column 405. A top column 405 is fixed to the top of the extrusion spring 404. The middle rotating plate 406 is connected between the lower sides of the top column 405 and the card slot 403. The middle of the middle rotating plate 406 is connected to the placement groove 401 through a rotating shaft. Both sides of the top of the buried base 200 are hinged with a buckle 407. The top of the buckle 407 is stuck in the bayonet 101. A connecting plate 408 is connected between one side of the middle of the buckle 407 and the top of the U-shaped connecting plate 402.

[0046] When in use, the top column 405 is pressed downward, and the top column 405 squeezes the extrusion spring 404, thereby driving the U-shaped connecting plate 402 to move downward. The downward movement of the U-shaped connecting plate 402 and the restriction of the middle rotating plate 406 on both sides of the placement groove 401 and the lower part of the top column 405 cause the top two sides of the U-shaped connecting plate 402 to move upward. The upward movement of the top two sides of the U-shaped connecting plate 402 drives the buckle 407 to rotate into the bayonet 101 through the connecting plate 408, thereby firmly clamping the buckle 407 in the bayonet 101, and the clamping purpose is achieved by the weight of the base 100 itself.

[0047] Furthermore, a placement groove is provided in the middle of the top of the top column 405 to facilitate the placement of the middle rotating plate 406.

[0048] Furthermore, a cylinder 500 in contact with the placement groove is vertically fixed to the middle of the bottom end of the base 100, so as to increase the length of the bottom end of the base 100 and facilitate the use of top columns 405 of different heights.

[0049] Furthermore, the limiting assembly 800 also includes a button 805 arranged at one end of the inner side of the fixed shell 801. The output end of the button 805 is connected to the input end of the cylinder 500 to facilitate the control of the cylinder 500. The button 805 and the cylinder 500 can be powered by an external power supply, such as a battery.

[0050] Furthermore, a heat dissipation window is provided inside the motor cabinet 300 , and a heat conducting plate is built into the heat dissipation window. The temperature inside the motor cabinet 300 is conducted to the heat dissipation window through the heat conducting plate, and heat is dissipated through the heat dissipation window.

[0051] The rest of the structure is the same as that of Example 1.

[0052] Working principle: During installation, the base 100 is directly placed on the buried base 200, and the buckle 407 is aligned with the bayonet 101. At this time, the cylinder 500 contacts the top column 405 and presses the top column 405 downward. The top column 405 squeezes the extrusion spring 404 at the same time, thereby driving the U-shaped connecting plate 402 to move downward. The downward movement of the U-shaped connecting plate 402 drives the middle rotating plate 406 to be restricted on both sides of the placement groove 401 and the lower part of the top column 405, so that the top two sides of the U-shaped connecting plate 402 move upward. The upward movement of the top two sides of the U-shaped connecting plate 402 drives the buckle 407 to rotate into the bayonet 101 through the connecting plate 408, thereby firmly clamping the buckle 407 in the bayonet 101.

[0053] When the engineer closes the cabinet door 600, when the cabinet door 600 rotates toward the motor cabinet 300, the semi-arc fixed block 708 contacts the clamping block 804, the semi-arc fixed block 708 squeezes the clamping block 804, and the elastic telescopic rod 803 is extended and retracted. When the semi-arc fixed block 708 passes through the clamping block 804, the clamping block 804 is stuck between the semi-arc fixed block 708 and the semi-arc movable block 709, and the clamping block 804 prevents the semi-arc fixed block 708 from moving back, so that the clamping block 804 plays the role of restricting the semi-arc fixed block 708, so that the cabinet door 600 is closed on the motor cabinet 300, and the cabinet door 600 will not be closed due to personal negligence. When opening, turn the handle 703 to make the rotating block 702 move in When the handle 703 is no longer rotated, the return spring 707 elastically returns the movable rod 706 to the outside, and the clamping block 804 contacts the semi-arc movable block 709, causing the semi-arc movable block 709 to move toward the semi-arc fixed block 708 on the movable rod 706. The semi-arc fixed block 708 and the semi-arc movable block 709 form an ellipsoidal shape, so that the clamping block 804 slides over the semi-arc fixed block 708 and the semi-arc movable block 709, and the semi-arc fixed block 708 returns to its initial position.

[0054] When disassembly is required, the handle 703 is rotated to the same horizontal position as the fixing seat 701, and the rotating block 702 is moved toward the limit slot 705, thereby increasing the distance moved by the moving rod 706, causing the semi-arc fixed block 708 to contact the button 805, causing the cylinder 500 to retract. After the cylinder 500 retracts, the top column 405 is no longer restricted, and the top column 405 is driven to move upward by the elastic recovery of the extrusion spring 404, thereby driving the U-shaped connecting plate 402 to move upward. The upward movement of the U-shaped connecting plate 402 and the restriction of the middle rotating plate 406 on both sides of the placement slot 401 and the lower part of the top column 405 cause the top two sides of the U-shaped connecting plate 402 to move downward. The downward movement of the top two sides of the U-shaped connecting plate 402 drives the buckle 407 to rotate outward of the bayonet 101 through the connecting plate 408, thereby disengaging the buckle 407 from the bayonet 101.

[0055] It is important to note that the construction and arrangement of the present application shown in a number of different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, directional changes, etc.) without departing substantially from the novel teachings and advantages of the subject matter described in this application. For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of the element may be inverted or otherwise changed, and the nature or number or position of the discrete elements may be altered or changed. Therefore, all such modifications are intended to be included within the scope of the present invention. The order or sequence of any process or method steps may be changed or reordered according to alternative embodiments. In the claims, any "means plus function" clause is intended to cover the structure described herein that performs the function, and is not only structurally equivalent but also equivalent structures. Other replacements, modifications, changes, and omissions may be made in the design, operating conditions, and arrangement of the exemplary embodiments without departing from the scope of the present invention. Therefore, the invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0056] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (i.e., those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0057] It will be appreciated that in the development of any actual embodiment, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will, for those of ordinary skill having the benefit of this disclosure, be a routine undertaking of design, fabrication, and production without undue experimentation.

[0058] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A transmission and distribution cabinet with a fixed structure, comprising a base (100), a buried base (200) below the base (100), and a motor cabinet body (300) vertically fixed to the top of the base (100), characterized in that: A cabinet door (600) is hingedly connected to one side of the motor cabinet (300), a switch assembly (700) is fixed to one side of the middle of the cabinet door (600), and a limit assembly (800) is fixed on the inner side of the motor cabinet (300) at a position corresponding to the switch assembly (700); The limit switch assembly (800) comprises a fixed shell (801) fixed at an inner position of the motor cabinet (300); movable holes (802) are evenly distributed on the inner side of the fixed shell (801) around a semi-arc-shaped fixed block (708); an elastic telescopic rod (803) is fixed on the inner side of the movable hole (802); a clamping block (804) for the limit switch assembly (700) is fixed at the end of the elastic telescopic rod (803); the switch assembly (700) is inserted into the clamping block (804) to close the cabinet door (600); Both sides of the base (100) are provided with bayonet holes (101), and a fastening assembly (400) for fastening the bayonet holes (101) is provided in the buried base (200); the fastening assembly (400) comprises a placement groove (401) provided in the buried base (200), a U-shaped connecting plate (402) is slidably connected inside the placement groove (401), and both sides of the U-shaped connecting plate (402) are symmetrically provided with bayonet holes (403), and a compression spring (403) is vertically fixed to the middle of the top of the U-shaped connecting plate (402). 4), a top column (405) is fixed to the top of the extrusion spring (404), a middle rotating plate (406) is connected between the lower sides of the top column (405) and the clamping groove (403), the middle of the middle rotating plate (406) is connected to the placement groove (401) through a rotating shaft, and a buckle (407) is hinged on both sides of the top of the buried base (200), the top of the buckle (407) is clamped in the bayonet (101), and a connecting plate (408) is connected between one side of the middle of the buckle (407) and the top of the U-shaped connecting plate (402).

2. The power transmission and distribution cabinet with a fixed structure according to claim 1, characterized in that: The switch assembly (700) comprises a fixed seat (701) fixed to one side of the middle of the cabinet door (600); a rotating block (702) is hinged on the fixed seat (701); a handle (703) is vertically fixed to the middle of the bottom end of the rotating block (702); a moving groove (704) is provided between the fixed seat (701) and the moving groove (704) on one side of the middle of the cabinet door (600); and a limiting groove (705) for limiting the movement of the rotating block (702) is provided on the fixed seat (701) and the moving groove (704). A moving rod (706) is slidably connected to the interior of the cabinet door (600) at a position corresponding to the fixed seat (701), a return spring (707) is connected between the outer side of the moving rod (706) and the inner side of the cabinet door (600), a semi-arc-shaped fixed block (708) is vertically fixed to one end of the moving rod (706) away from the rotating block (702), and a semi-arc-shaped moving block (709) with a limit block is slidably connected to the outer side of the moving rod (706) near the semi-arc-shaped fixed block (708).

3. The power transmission and distribution cabinet with a fixed structure according to claim 2, characterized in that: A protrusion is fixed on one end of the upper portion of the fixing seat (701) close to the movable groove (704), and a notch is provided at a corresponding position on the upper portion of the movable rod (706).

4. The power transmission and distribution cabinet with a fixed structure according to claim 1, characterized in that: A placement groove is provided at the middle of the top end of the top column (405).

5. The power transmission and distribution cabinet with a fixed structure according to claim 1, characterized in that: A cylinder (500) in contact with the placement groove is vertically fixed to the middle of the bottom end of the base (100).

6. The power transmission and distribution cabinet with a fixed structure according to claim 1, characterized in that: The position limiting assembly (800) further comprises a button (805) arranged at one end of the inner side of the fixed shell (801), and the output end of the button (805) is connected to the input end of the cylinder (500).

7. The power transmission and distribution cabinet with a fixed structure according to claim 1, characterized in that: A heat dissipation window is provided on the inner side of the motor cabinet (300), and a heat conducting plate is built into the heat dissipation window.

8. The power transmission and distribution cabinet with a fixed structure according to claim 2, characterized in that: The limiting groove (705) is provided with a lock for limiting the rotation of the rotating block (702).

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