Intelligent circuit breaker of electromagnet actuating mechanism

Abstract

The utility model provides an intelligent circuit breaker of an electromagnet actuating mechanism. The intelligent circuit breaker comprises a working circuit assembly and a control circuit board. The working circuit assembly and the control circuit board are installed in the base and connected through a connector, and a working circuit interface and a control circuit board interface are arranged on the side wall of one tail end of the base and connected with the working circuit assembly and the control circuit board respectively. According to the utility model, the electromagnet actuating mechanism is used as a driving part of the circuit breaker and is responsible for converting a control signal into a mechanical action so as to realize switching-on and switching-off operation of the circuit breaker. Therefore, the circuit breaker has higher precision and high stability, has the characteristics of quick response and long service life, and adapts to frequent operation requirements in an electric power system. And intelligent control and protection functions are added, and the primary circuit immediately takes protection measures when an abnormality is found by monitoring the operation state of the power system in real time, so that fault expansion is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to an intelligent circuit breaker of electromagnet actuator. BACKGROUND

[0002] The rapid development of smart grid and automation technology puts forward higher requirements for circuit breaker equipment in the power system. As a crucial component in the power system, the performance of the circuit breaker directly affects the stability, reliability and safety of the power system. Traditional circuit breaker operation mostly relies on manual operation, which has problems such as inconvenient operation, low efficiency and insufficient intelligence. Therefore, it is particularly urgent to develop an intelligent circuit breaker with high-performance electromagnet actuator to meet the needs of automation, intelligence and efficiency of modern power systems. For example, CN118748139A discloses a liquid magnetic circuit breaker with remote opening and a remote opening mode, which opens and closes the circuit breaker through two electromagnets respectively to control the opening and closing of the circuit breaker, but it does not set a protection setting during the line overheating process, so it cannot protect itself. SUMMARY

[0003] To solve the above technical problems, the utility model provides an intelligent circuit breaker of electromagnet actuator.

[0004] The utility model discloses a technical scheme.

[0005] The utility model provides an intelligent circuit breaker of electromagnet actuator, including working circuit component and control electric board, working circuit component and control electric board are installed in base and are connected through connector, one end side wall of base is equipped with working circuit interface and control electric board interface respectively and is connected with working circuit component and control electric board, working circuit component includes dynamic point component, electromagnetic push rod, transient electromagnetic push rod, handle, static contact, dynamic point component does the arc line motion under the drive of electromagnetic push rod, static contact and transient electromagnetic push rod one end are connected, and the other end of transient electromagnetic push rod is connected with working circuit interface, and static contact and transient electromagnetic push rod are all equipped in the movement track of dynamic point component, handle is connected with dynamic point component through pull rod, and the direction of pull rod is parallel with electromagnetic push rod.

[0006] The control electric board is installed at the bottom of the base, and the side adjacent to the control electric board interface of the control electric board is connected with the connector installed in the control electric board interface. The working circuit component is installed on the terminal seat, and the terminal seat is installed above the control electric board. One end of the base adjacent to the working circuit interface is provided with two spring blades connected with the working circuit component. The two spring blades are respectively installed in the two spring blade grooves at the ends of the terminal seat.

[0007] The upper end face of the terminal seat is processed with a groove to accommodate a moving point assembly, the moving point assembly is connected with the two spring contact pieces through conductive pieces respectively, and the conductive pieces are installed on the outer side wall of the terminal seat.

[0008] The moving point assembly comprises a closing buckle and an opening buckle, and the closing buckle and the opening buckle are sequentially hinged on the terminal seat through an opening buckle rotating shaft. A rotating sleeve is installed on the other end face of the closing buckle, and the rotating sleeve is perpendicularly hinged with a transmission rod through a rotating shaft. The lower end of the closing buckle is in gear with a rack, and the rack is installed in the extension direction of an electromagnetic push rod. The other end of the transmission rod is perpendicularly connected in the middle of a buckle plate below the closing buckle. One end of the buckle plate is hinged with one end of a transmission plate, and the other end of the buckle plate is processed with a lock groove. The middle part of the transmission plate and the lock buckle are hinged on the terminal seat through a lock buckle rotating shaft. The other end of the transmission plate is connected with a moving contact holder, and the end of the moving contact holder is provided with a moving contact. One end of the lock buckle adjacent to the buckle plate is processed with a lock tongue, and the other end of the lock buckle extends to the middle part of the moving contact. The opening buckle is U-shaped, and the movement track of one end of the opening buckle adjacent to the lock buckle interferes with the uppermost part of the lock buckle. The other end of the opening buckle is placed in front of the push rod of the electromagnetic push rod. The electromagnetic coil of the instantaneous electromagnetic push rod is connected with the spring contact pieces through conductive pieces.

[0009] The middle part of the lock buckle is triangular, one of the angles is hinged with the lock buckle rotating shaft, and the other two angles are connected with a push plate and the lock tongue respectively. An upward protrusion is arranged on the side opposite to the lock buckle rotating shaft, the top of the protrusion is provided with a transmission column. The end of the push plate is bent towards the middle part of the moving contact holder, and the lock tongue is processed with a sharp corner facing the buckle plate. A torsional spring is installed on the lock buckle rotating shaft, one end of the torsional spring extends to the opening buckle and is fixed on one end of the opening buckle adjacent to the instantaneous electromagnetic push rod. A limiting column is installed on the transmission plate between the lock buckle and the buckle plate rotating shaft.

[0010] The moving contact holder is also connected with a contact tension spring, and the other end of the contact tension spring is installed below the moving contact holder and fixed on a stand column below the moving contact holder and fixed on the terminal seat.

[0011] The stationary contact and the moving contact are arranged in the opening of an arc guiding cavity, and the other end of the arc guiding cavity is connected with an arc extinguishing grid.

[0012] A disconnecting hook is further arranged below the moving contact holder, one end of the disconnecting hook is arranged between the moving contact holder and the stationary contact and provided with a protrusion higher than the disconnecting hook. The disconnecting hook is parallel to the stationary contact and faces the disconnecting hook, and the other end of the disconnecting hook is connected with one end of a bimetallic strip. The bimetallic strip is arranged along the side wall of the terminal seat, and the other end of the bimetallic strip is fixed on the side wall of the terminal seat.

[0013] A handle is connected with the rack in the moving point assembly through a pull rod, and the handle is arranged outside the terminal seat. A handle spring is installed between the pull rod and the terminal seat.

[0014] The base is further provided with an upper cover, the bottom of the base is provided with an internal thread seat, the upper cover is provided with a countersunk hole, and a bolt is connected with the internal thread seat by penetrating the countersunk hole, the terminal seat and the control panel.

[0015] The electromagnetic iron actuator is used as the driving component of the circuit breaker, is responsible for converting the control signal into mechanical action, and realizes the opening and closing operation of the circuit breaker. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a structural schematic view of the utility model;

[0017] Figure 2 It is a schematic view of the seat plate and working circuit assembly assembling structure of the utility model;

[0018] Figure 3 It is a schematic view of the circuit breaker opening structure of the utility model;

[0019] Figure 4 It is a schematic view of the circuit breaker closing structure of the utility model;

[0020] Figure 5 It is a schematic view of the movable contact driving structure of the utility model;

[0021] Figure 6 It is a schematic view of the appearance structure of the utility model;

[0022] In the figure: 1-electromagnetic push rod, 2-rack, 3-unlatch shaft, 4-latch, 5-transmission rod, 6-moving point frame, 61-moving point frame shaft, 62-tension spring slot, 7-transmission plate, 71-square type limiting column, 8-lock, 81-push plate, 82-transmission column, 83-lock tongue, 9-torsional spring, 10-unlatch, 11-static contact, 12-latch plate, 121-shaft seat, 122-lock slot, 13-contact tension spring, 14-latch plate shaft, 15-handle spring, 16-pull handle, 17-lock shaft, 18-limiting column, 19-bimetallic strip, 20-split brake hook, 21-transient electromagnetic push rod, 22-upper cover, 23-terminal seat, 24-control board, 25-conductive sheet, 26-base, 27-working circuit assembly, 28-moving contact, 29-spring sheet slot, 30-spring sheet, 31-arc extinguishing grid, 32-arc guiding cavity, 33-control board interface, 34-pull handle limiting column, 35-inner threaded seat, 36-electromagnet connector, 37-interface connecting seat, 38-working circuit interface, 39-pull rod, 40-rotary sleeve. DETAILED DESCRIPTION

[0023] The technical scheme of the utility model is further described below, but the scope of protection is not limited to the description.

[0024] The intelligent circuit breaker of the electromagnet actuator provided by the utility model comprises a working circuit assembly and a control board 24; the working circuit assembly and the control board 24 are installed in a base 26 and are connected through a connector; one end side wall of the base 26 is respectively provided with a working circuit interface 38 and a control board interface 33 which are respectively connected with the working circuit assembly and the control board 24; the working circuit assembly comprises a moving point assembly, an electromagnetic push rod 1, a transient electromagnetic push rod 21, a pull handle 16 and a static contact 11; the moving point assembly moves in an arc line around a shaft under the drive of the electromagnetic push rod 1; the static contact 11 is connected with one end of the transient electromagnetic push rod 21, the other end of the transient electromagnetic push rod 21 is connected with the working circuit interface 38, and the static contact 11 and the transient electromagnetic push rod 21 are both arranged on the movement track of the moving point assembly; the pull handle 16 is connected with the moving point assembly through a pull rod, and the direction of the pull rod is parallel to that of the electromagnetic push rod 1.

[0025] The control board 24 is installed at the bottom of the base 26; one side of the control board 24 adjacent to the control board interface 33 is connected with the connector installed in the control board interface 33; the working circuit assembly 27 is installed on a terminal seat 23, the terminal seat 23 is installed above the control board 24, one end of the base 26 adjacent to the working circuit interface 38 is provided with two spring sheets 30 connected with the working circuit assembly 27; the two spring sheets 30 are respectively installed in two spring sheet slots 29 at the ends of the terminal seat 23. The control circuit and the working circuit are completely isolated through the terminal seat; for example Figure 6The breaker working circuit component and the control electric board 24 are physically completely isolated by the terminal seat 23, avoiding mutual influence of the working circuit component and the control circuit. Working circuit: refers to the circuit for supplying power to the load in the breaker. Control circuit: refers to the circuit for controlling the breaker, providing communication and data exchange.

[0026] The upper end face of the terminal seat 23 is processed with a groove accommodating the moving point component, the moving point component is connected with the two contact spring sheets 30 through the conductive sheet 25 respectively, and the conductive sheet 25 is installed on the outer side wall of the terminal seat 23.

[0027] The moving point component includes the closing buckle 4 and the tripping buckle 10, and the closing buckle 4 and the tripping buckle 10 are sequentially hinged on the terminal seat 23 through the tripping hinge shaft 3. The other end face of the closing buckle 4 is installed with the rotating sleeve 40, the rotating sleeve 40 is vertically hinged with the transmission rod 5 through the rotating shaft, the lower end of the closing buckle 4 is in gear with the rack 2, and the rack 2 is installed in the extension direction of the push rod of the electromagnetic push rod 1. The other end of the transmission rod 5 is vertically connected in the middle of the buckle plate 12 below the closing buckle 4, one end of the buckle plate 12 is hinged with one end of the transmission plate 7, the other end of the buckle plate 12 is processed with the lock groove 122, the middle part of the transmission plate 7 and the lock buckle 8 are hinged on the terminal seat 23 through the lock buckle rotating shaft 17, the other end of the transmission plate 7 is connected with the moving point frame 6, and the end of the moving point frame 6 is provided with the moving contact 28. One end of the lock buckle 8 adjacent to the buckle plate 12 is processed with the lock tongue 83, and the other end of the lock buckle 8 extends to the middle part of the moving contact 28. The tripping buckle 10 is U-shaped, the movement track of one end adjacent to the lock buckle 8 forms interference with the uppermost part of the lock buckle 8, and the other end is placed in front of the push rod of the electromagnetic push rod 1. The electromagnetic coil of the instantaneous electromagnetic push rod 21 is connected with the contact spring sheet 30 through the conductive sheet 25.

[0028] The middle part of the lock buckle 8 is triangular, one of the angles is hinged on the lock buckle rotating shaft 17, and the other two angles are respectively connected with the push plate 81 and the lock tongue 83. The side opposite to the lock buckle rotating shaft 17 is provided with an upward protrusion, the top of the protrusion is installed with the transmission column 82, the end of the push plate 81 is bent towards the middle part of the moving point frame 6, and the lock tongue 83 is processed with a sharp corner towards the buckle plate 12. The lock buckle rotating shaft 17 is installed with the torsional spring 9, one end of the torsional spring 9 extends to the tripping buckle 10 and is fixed at one end of the tripping buckle 10 adjacent to the instantaneous electromagnetic push rod 21. The transmission plate 7 is installed with the limiting column 18 between the lock buckle 8 and the buckle plate rotating shaft 14.

[0029] The moving point frame 6 is also connected with the contact tension spring 13, and the other end of the contact tension spring 13 is installed below the moving point frame 6 and fixed on the stand column on the terminal seat 23.

[0030] The static contact 11 and the moving contact 28 are placed in the opening of the arc guiding cavity 32, and the other end of the arc guiding cavity 32 is connected with the arc extinguishing grid 31.

[0031] The lower part of the moving point frame 6 is also provided with a disconnecting hook 20, one end of the disconnecting hook 20 is arranged between the moving point frame 6 and the static contact 11 and is provided with a protrusion higher than the disconnecting hook 20, the disconnecting hook 20 faces the static contact 11 and the other end is connected with one end of the bimetallic strip 19, the bimetallic strip 19 is arranged along the side wall of the terminal seat 23, and the other end of the bimetallic strip 19 is fixed on the side wall of the terminal seat 23.

[0032] The handle 16 is connected with the rack 2 in the moving point assembly through a pull rod 39, the handle 16 is arranged outside the terminal seat 23, and the handle spring 15 is arranged between the pull rod 39 and the terminal seat 23.

[0033] The base 26 is provided with an upper cover 22, the bottom of the base 26 is provided with an internally threaded seat 35, the upper cover 22 is provided with a countersunk hole, and the bolt passes through the countersunk hole, the terminal seat 23 and the control panel 24 and is connected with the internally threaded seat 35.

[0034] Embodiment:

[0035] Remote closing: as Figure 3 , at this time, the circuit breaker is in the open state, when the electromagnet 1 receives the closing signal, the internal core pops out to drive the transmission member 2 to move to the static contact 11, the transmission member 2 drives the intermediate piece 4 to rotate clockwise around the shaft 3, the intermediate piece 4 drives the moving point frame 6 to rotate clockwise around the shaft 7 to contact the static contact 11 in the process of rotating through the transmission rod 5, and the circuit breaker completes closing.

[0036] In the closing process of the circuit breaker, the release member 10 rotates clockwise around the shaft 3 under the action of the lock spring 9, after the closing is completed, the release member 10 contacts the lock catch 8, and the other end of the release member 10 is located in front of the core of the electromagnet 1 to prepare for the remote opening process.

[0037] Remote opening: as Figure 3 , at this time, the circuit breaker is in the closed state, when the electromagnet 1 receives the opening signal, the internal core pops out to drive the release member 10 to rotate clockwise around the shaft 3, thereby driving the lock catch 8 to rotate counterclockwise around the shaft 7, the lock catch 8 is separated from the hasp plate 12 after rotating to a certain angle, and the moving point frame 6 rotates counterclockwise around the shaft 7 under the action of the contact spring 13 after the lock catch 8 is separated from the hasp plate 12, and the circuit breaker completes opening.

[0038] In the opening process of the circuit breaker, the transmission member 2 moves outward under the action of the handle spring 15, thereby driving the intermediate piece 4 to rotate counterclockwise around the shaft 3, the intermediate piece 4 drives the hasp plate 12 to rotate clockwise around the shaft 14 in the process of rotating through the transmission rod 5, the hasp plate 12 is in contact with the clamping groove of the lock catch 8 after rotating to a certain angle, and the hasp plate 12 is in the locked state, thereby providing conditions for the next closing.

[0039] In the process of breaking, the middle piece 4 rotates counterclockwise around the shaft 3, and after rotating to a certain angle, the tripping piece 10 is driven to rotate clockwise around the shaft 3, and after the breaking process is completed, the tripping piece 10 is located on the side of the core of the electromagnet 1, and at this time the transmission piece 2 is located in front of the electromagnet 1, providing conditions for the next closing.

[0040] Manual closing: as Figure 3 At this time, the circuit breaker is in the breaking state, and under the action of the handle 16, the transmission piece 2 drives the middle piece 4 to rotate clockwise around the shaft 3, and in the process of rotation, the middle piece 4 drives the moving point frame 6 to rotate clockwise around the shaft 7 through the transmission rod 5 until the moving point frame 6 contacts the static contact 11, and the circuit breaker completes the closing.

[0041] Manual breaking: as Figure 4 At this time, the circuit breaker is in the closing state, and under the action of the handle 16, the transmission piece 2 drives the middle piece 4 to rotate counterclockwise around the shaft 3, and in the process of rotation, the middle piece 4 drives the moving point frame 6 to rotate counterclockwise around the shaft 7 through the transmission rod 5, and the moving point frame 6 is separated from the static contact 11, and the circuit breaker completes the breaking.

[0042] As Figure 5 In the process of manual closing, manual breaking, and remote closing, the buckle plate 12 is in a locked state in the clamping groove of the lock catch 8, and at this time, the lock catch 8, the buckle plate 12, the transmission piece 17, and the moving point frame 6 are driven to rotate around the shaft 7 under the action of the lock catch spring 9, the contact tension spring 13, and the closing and breaking driving force.

[0043] As Figure 3 In the closing process, after the moving point frame 6 contacts the static contact 11, one end of the moving point frame 6 is fixed by the static contact 11, and under the action of the transmission piece 17 and the contact tension spring 13, the moving point frame 6 continues to rotate to rotate counterclockwise around the shaft 18, ensuring reliable contact between the moving point frame 6 and the contact 11.

[0044] Backup mechanical protection: as Figure 4 The bimetallic strip 19 bends under heat to drive the transmission piece 20 to move towards the bimetallic strip 19, and under the action of the transmission piece 20, the lock catch 8 is driven to rotate counterclockwise around the shaft 7, and after rotating to a certain angle, the lock catch 8 is separated from the buckle plate 12, and after the lock catch 8 is separated from the buckle plate 12, the moving point frame 6 rotates counterclockwise around the shaft 7 under the action of the contact tension spring 13, and the circuit breaker completes the breaking. Figure 4 Instantaneous core 21 is ejected under the action of short-circuit current, driving the lock catch 8 to rotate counterclockwise around the shaft 7, and after rotating to a certain angle, the lock catch 8 is separated from the buckle plate 12, and after the lock catch 8 is separated from the buckle plate 12, the moving point frame 6 rotates counterclockwise around the shaft 7 under the action of the contact tension spring 13, and the circuit breaker completes the breaking.

Claims

1. An intelligent circuit breaker for electromagnet actuator comprising of working circuit assembly and control panel (24) characterized by: The working circuit component and control electric board (24) are installed in the base (26) and connected by the connector, and the base (26) is provided with working circuit interface (38) and control electric board interface (33) on the end side wall respectively and connected with the working circuit component and control electric board (24); the working circuit component includes moving point component, electromagnetic push rod (1), instantaneous electromagnetic push rod (21), handle (16), static contact (11), the moving point component does the arc motion around the rotation axis under the drive of electromagnetic push rod (1), the static contact (11) is connected with one end of instantaneous electromagnetic push rod (21), the other end of instantaneous electromagnetic push rod (21) is connected with working circuit interface (38), static contact (11) and instantaneous electromagnetic push rod (21) are all arranged on the movement track of moving point component, the handle (16) is connected with moving point component through pull rod, and the direction of pull rod is parallel with electromagnetic push rod (1).

2. The electromagnet actuator based intelligent circuit breaker as claimed in claim 1, wherein: The control electric board (24) is installed at the bottom of base (26), and the side adjacent to control electric board interface (33) of control electric board (24) is connected with the connector installed in control electric board interface (33); the working circuit component (27) is installed on terminal seat (23), and terminal seat (23) is installed above control electric board (24), and the end adjacent to working circuit interface (38) of base (26) is provided with two spring contact pieces (30) connected with working circuit component (27); two spring contact pieces (30) are respectively installed in two spring slot (29) at the end of terminal seat (23).

3. The electromagnet actuator intelligent circuit breaker of claim 2, wherein: The upper end face of terminal seat (23) is processed with recess to accommodate moving point component, and the moving point component is connected with two spring contact pieces (30) through conductive sheet (25) respectively, and the conductive sheet (25) is installed on the outer side wall of terminal seat (23).

4. The electromagnet actuator intelligent circuit breaker of claim 3, wherein: The moving point assembly comprises a closing buckle (4) and a releasing buckle (10), the closing buckle (4) and the releasing buckle (10) are hingedly connected in sequence on the terminal seat (23) through a releasing hinge shaft (3), the other end surface of the closing buckle (4) is provided with a rotating sleeve (40), the rotating sleeve (40) is hingedly connected with a transmission rod (5) perpendicularly through a rotating shaft, the lower end of the closing buckle (4) is engaged with a rack (2), the rack (2) is installed on the extension direction of the electromagnetic push rod (1), the other end of the transmission rod (5) is perpendicularly connected in the middle of a buckle plate (12) below the closing buckle (4), one end of the buckle plate (12) is hingedly connected with one end of a transmission plate (7), the other end of the buckle plate (12) is provided with a locking groove (122), the middle part of the transmission plate (7) and a lock buckle (8) are hingedly connected on the terminal seat (23) through a lock buckle rotating shaft (17), the other end of the transmission plate (7) is connected with a moving point frame (6), the moving point frame (6) is provided with a moving contact (28) at the end thereof, one end of the lock buckle (8) adjacent to the buckle plate (12) is provided with a locking tongue (83), the other end of the lock buckle (8) extends to the middle part of the moving contact (28), the releasing buckle (10) is U-shaped, the movement track of one end of the releasing buckle (10) adjacent to the lock buckle (8) interferes with the uppermost part of the lock buckle (8), the other end of the releasing buckle (10) is arranged in front of the electromagnetic push rod (1), the electromagnetic coil of the instantaneous electromagnetic push rod (21) is connected with a contact spring (30) through a conductive sheet (25).

5. The intelligent circuit breaker of the electromagnet actuator as described in claim 4, characterized in that: The middle part of the lock buckle (8) is triangular, one of the angles is hingedly connected with the lock buckle rotating shaft (17), the other two angles are respectively connected with a push plate (81) and the locking tongue (83), the side opposite to the lock buckle rotating shaft (17) is provided with an upward protrusion, the top of the protrusion is provided with a transmission column (82), the end of the push plate (81) is bent towards the middle part of the moving point frame (6), the locking tongue (83) is provided with a sharp corner facing the buckle plate (12), the lock buckle rotating shaft (17) is provided with a torsional spring (9), one end of the torsional spring (9) extends to the releasing buckle (10) and is fixed on one end of the releasing buckle (10) adjacent to the instantaneous electromagnetic push rod (21), the transmission plate (7) is provided with a limiting column (18) between the lock buckle (8) and the buckle plate rotating shaft (14).

6. The electromagnet actuator intelligent circuit breaker of claim 5, wherein: The moving point frame (6) is further connected with a contact tension spring (13), the other end of the contact tension spring (13) is installed below the moving point frame (6) and fixed on a stand column on the terminal seat (23).

7. The electromagnet actuator intelligent circuit breaker of claim 1, wherein: The static contact (11) and the moving contact (28) are arranged in the opening of an arc guiding cavity (32), the other end of the arc guiding cavity (32) is connected with an arc extinguishing grid (31).

8. The electromagnet actuator intelligent circuit breaker of claim 6, wherein: The moving point frame (6) is further provided with an opening hook (20), one end of the opening hook (20) is arranged between the moving point frame (6) and the static contact (11) and provided with a protrusion higher than the opening hook (20), the opening hook (20) is parallel to the static contact (11) and faces the setting, the other end of the opening hook (20) is connected with one end of a bimetallic strip (19), the bimetallic strip (19) is arranged along the side wall of the terminal seat (23), the other end of the bimetallic strip (19) is fixed on the side wall of the terminal seat (23).

9. The electromagnet actuator intelligent circuit breaker of claim 1, wherein: The handle (16) is connected with the rack (2) in the moving point assembly through a pull rod (39), the handle (16) is arranged outside the terminal seat (23), and a handle spring (15) is arranged between the pull rod (39) and the terminal seat (23).

10. The electromagnet actuator intelligent circuit breaker of claim 1, wherein: The base (26) is further provided with an upper cover (22), the bottom of the base (26) is provided with an internally threaded seat (35), the upper cover (22) is provided with a countersunk hole, and a bolt passes through the countersunk hole, the terminal seat (23) and the control electric board (24) and is connected with the internally threaded seat (35).

Images