A brush head replaceable electric toilet brush

Abstract

The utility model discloses a brush head can change's electric toilet brush, including handle, be equipped with motor on the handle, the power output shaft of motor is used for with brush head power connection, the assembly groove of opening and the power output shaft of the motor are adapted to be seted up in the brush head, the fixed hole is seted up in the groove wall position of assembly groove, the fixed part that is used for with fixed hole cooperation is equipped with in the power output shaft, the control mechanism that can make fixed part and fixed hole separate is equipped with in the handle, the inner wall of assembly groove with first thrust piece are established between power output shaft, when control mechanism starts, can control fixed part and slip along the axial position of fixed hole, after fixed part and fixed hole separate, first thrust piece can exert axial force to brush head to make brush head and power output shaft separate. The utility model has the advantages of falling off through magnetic force, avoids user direct contact brush head and guarantees that brush head can steady pop -out and fall off.

Description

Technical Field

[0001] This utility model belongs to the field of toilet brush technology, and in particular relates to an electric toilet brush with replaceable brush head. Background Technology

[0002] Most existing toilet brush heads and handles are one-piece structures, making it impossible to replace the brush head. As a porous polymer, the brush head is prone to bacterial growth after continuous use in water containing bacteria, forming a source of cross-contamination and failing to meet the basic hygiene requirements of a cleaning tool.

[0003] Chinese patent application No. 202422221237.4 discloses an electric toilet brush, including a handle, a motor, and a brush head. The motor is installed inside the handle, which is also equipped with a control switch for controlling the motor. A transmission shaft is installed on the output shaft of the motor, and a limiting groove is provided at the bottom of the transmission shaft. A mounting seat is provided on the brush head, and several locking blocks are provided on the mounting seat. The locking blocks are engaged in the limiting groove. When the control switch is pressed, the motor starts and drives the transmission shaft and the brush head to rotate relative to the handle. The handle includes a first housing sleeved on the outside of the transmission shaft and a second housing sleeved on the outside of the first housing. The first housing can move downward relative to the second housing. The downward movement of the first housing drives the locking blocks to move and disengage the locking blocks from the limiting groove.

[0004] In the above technical solution, the first housing moves downward relative to the second housing until the locking block deforms and disengages from the limiting slot, thus completing the disassembly of the brush head. However, in the above technical solution, the first housing only applies force to the outer axial end face of the locking block. After the brush head has been used, its surface will inevitably be covered with detergent and sewage, causing the point of force application of the first housing to the locking block to slip easily. This makes it difficult for the first housing to deform the locking block, making it difficult for the brush head to disengage. Furthermore, the disassembly process of the brush head depends on the action of the first housing extending the handle. When solid contaminants are attached to the outer surface of the handle, there is a possibility that they will be embedded between the first housing and the second housing after the first housing retracts. This causes the end of the handle near the brush head to become a constant source of pollution and difficult to clean, resulting in poor performance. Summary of the Invention

[0005] To address the shortcomings of existing technologies, an electric toilet brush with replaceable brush heads is provided.

[0006] This utility model is achieved using the following technical solution:

[0007] An electric toilet brush with replaceable brush head includes a handle, a motor mounted on the handle, and a power output shaft of the motor for power connection to the brush head. The brush head has an opening in a mounting groove that mates with the power output shaft of the motor. A fixing hole is formed in the wall of the mounting groove. A fixing member is provided within the power output shaft for engaging with the fixing hole. The handle includes a control mechanism that allows the fixing member to slide along the axis of the power output shaft and disengage from the fixing hole. A first thrust member is provided between the inner wall of the mounting groove and the power output shaft. When the control mechanism is activated, it controls the fixing member to slide axially along the fixing hole. After the fixing member disengages from the fixing hole, the first thrust member applies an axial force to the brush head to disengage from the power output shaft.

[0008] When the user needs to replace the brush head, the control mechanism disengages the fixing part from the fixing hole, thereby unlocking the brush head. At this time, the first thrusting part automatically pops out through axial force. Since the locking force used to lock the brush head and the axial force used to disengage the brush head both act inside the brush head, the contact area between the control mechanism and external contaminants is reduced, avoiding slippage during brush head disassembly and the accumulation of dirt in the control mechanism. This allows the user to reliably replace the brush head without direct contact.

[0009] Preferably, the power output shaft includes the output shaft of the motor and a transmission shaft coaxially connected to the output shaft. The end of the transmission shaft that is axially exposed on the handle has a clearance hole for the fixing member to be exposed. The clearance hole corresponds to the fixing hole. The fixing member has at least one upper end face located in the axial direction that abuts against the upper hole wall of the fixing hole, so that the brush head is connected to the transmission shaft through the fixing member. The transmission shaft is designed to extend the output shaft of the motor, thereby facilitating the transmission of the output shaft of the motor and avoiding secondary assembly processing of the output shaft.

[0010] The fixing hole can be a through hole type structure or a blind hole type structure that fits with the end of the fixing member; or it can be a slide type structure that fits with the width of the fixing member and has at least one end wall for blocking and limiting along its own length direction.

[0011] Preferably, the fixing member is two locking blocks that are inserted into each other along the radial direction of the drive shaft. The two locking blocks can slide simultaneously along the radial direction of the drive shaft to move away from or towards each other. The ends of the two locking blocks that are away from each other are provided with protrusions, which can pass through the relief hole and be embedded in the fixing hole.

[0012] The two locking blocks form a mirror-interlocking tenon and mortise structure, using the protrusions on both sides to axially limit the brush head and transmit the torque of the second small diameter part so that the brush head can rotate synchronously and prevent slippage between the brush head and the drive shaft.

[0013] Preferably, the drive shaft has a hollow structure, and the drive shaft includes a first small diameter section, a large diameter section and a second small diameter section in sequence along the axial direction. The first small diameter section is poweredly connected to the output shaft, and the clearance hole is provided on the second small diameter section.

[0014] The stepped shaft extension structure, consisting of a first minor diameter section, a major diameter section, and a second minor diameter section, facilitates the installation of locking blocks.

[0015] Preferably, the locking block is located inside the second small diameter section and is limited and supported by the axial inner wall of the second small diameter section. The handle is provided with a control structure near the first small diameter section for controlling the two locking blocks to move away from or closer to each other.

[0016] By embedding the locking block inside the second small diameter section, it is prevented from coming into contact with sewage. Compared with the traditional exposed snap-on design, this avoids the problem of creating unsanitary corners. Furthermore, since the edges of the brush head are not exposed, it rotates and agitates the sewage, thus preventing hair from getting tangled on the brush head.

[0017] Preferably, the control structure includes, along the axial direction, a coil disposed between the first small diameter section and the inner wall of the handle, an inner core that can slide axially within the first small diameter section, a sliding member disposed at the end of the inner core away from the coil, and a control slider for sliding connection with the locking block. The sliding member is magnetic or can be magnetized. The control slider and the sliding member are interlocked to maintain synchronous sliding. The large diameter section is provided with a second thrust member for enabling the control slider to slide axially toward the locking block.

[0018] By setting a control slider that can slide along the handle axis to control the movement of the locking block, compared to setting the control unit in the middle of the two locking blocks, the radial space occupied by the control unit can be reduced, thereby reducing the radial cross-sectional area of ​​the handle and making it easier for the user to hold the handle.

[0019] The sliding element can be a permanent magnet, such as a magnet; or it can be a soft magnet, such as iron wound with conductive copper wire.

[0020] The inner core can be made of any existing ferromagnetic material, such as iron, chromium, or nickel.

[0021] Preferably, after the coil is energized, a first traction force is generated between it and the sliding member, and the inner core is made of a magnetic material and generates a second traction force between it and the sliding member. The thrust of the second thrust member is less than the sum of the first traction force and the second traction force.

[0022] By energizing the coil, the magnetic field generated by the inner core is increased, thereby increasing the traction force on the slider. By changing the magnitude of the traction force, the working state of the second thrust component is switched, thereby causing it to drive the control slider to slide.

[0023] Preferably, both locking blocks include a mating portion located at one end close to each other and a protrusion located at one end far from each other. The two locking blocks can be interlocked through the mating portion. The volume of the protrusion is smaller than the volume of the mating portion. The cross-sectional shape of the fixing hole and the clearance hole is the same as the cross-sectional shape of the protrusion.

[0024] The brush head is fixed by the protrusion exposed outside the clearance hole and engaging with the fixing hole. When the two locking blocks slide in a direction that brings them closer together, the protrusion disengages from the fixing hole, thus unlocking the brush head. The two locking blocks are guided to slide by two interlocking parts, so that the locking blocks can slide in a preset direction without the need for a limiting slide to limit the sliding direction of the locking blocks, thus saving the axial length of the drive shaft.

[0025] Preferably, the two locking blocks have control slides on their two end faces in the sliding direction. The control slides are inclined, with one end of the control slide near the control slider located near the protrusion, and the other end of the control slide away from the control slider located away from the protrusion.

[0026] The slide structure between the starting and ending positions of the two control slides can be either straight or curved.

[0027] Preferably, the control slider has at least two ears extending to both sides in the sliding direction of the two locking blocks. The inner side of the two ears is provided with a control slide rod embedded in the control slide track. The power reversal of the control slider is realized by the control slide rod embedded in the control slide track, so that the control slider can control the two locking blocks to move closer or further apart from each other.

[0028] Compared with the prior art, the beneficial effects of this utility model are:

[0029] By changing the force applied to the second thrust component, the working state of the second thrust component is switched, thereby causing the control slider to slide along the axial direction of the handle to trigger the two locking blocks to move closer or further apart. This allows the brush head to be unlocked or locked inside the brush head and the handle, forming a physical isolation layer on the internal structure of the electric toilet brush. This prevents the internal structure of the electric toilet brush from becoming contaminated and creating unsanitary dead corners that could become a regular source of pollution.

[0030] The brush head is disengaged by the first thrust component, forming a built-in ejection action. This avoids direct contact between the user and the brush head and ensures that the brush head can be ejected stably. Compared with the method of deforming the locking block by axial force, this avoids the situation where the brush head is difficult to disengage due to the locking block failing to achieve the predefined deformation. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of an electric toilet brush with replaceable brush head according to the present invention.

[0032] Figure 2 This is an exploded view of the handle and brush head in this utility model;

[0033] Figure 3 This is a schematic diagram of the exploded structure of this utility model;

[0034] Figure 4 This is an exploded view of the internal structure of this utility model;

[0035] Figure 5 for Figure 4 Enlarged structural diagram at point A;

[0036] Figure 6 This is a cross-sectional structural diagram of the present invention;

[0037] Figure 7 for Figure 6 Enlarged structural diagram at point B;

[0038] Figure 8 This is an exploded structural diagram of the control slider and locking block in this utility model;

[0039] Figure 9 This is a schematic diagram of the structure of the two locking blocks after separation in this utility model;

[0040] Figure 10 This is a schematic diagram of the structure of the control slider under the upward viewing angle in this utility model.

[0041] Reference numerals: 11. Handle; 12. Brush head; 13. Connecting seat; 14. Sponge; 15. Assembly slot; 16. Fixing hole; 17. Motor; 171. Output shaft; 18. Drive shaft; 181. First small diameter section; 182. Large diameter section; 183. Second small diameter section; 184. First barb; 1841. Support part; 1842. Stop part; 20. Clearance hole; 21. First thrust spring ; 22. Coil; 23. Inner core; 24. Sliding component; 25. Second thrust spring; 26. Control slider; 261. Double ear part; 262. Control slide rod; 263. Clearance space; 27. Locking block; 271. Mating part; 2711. Wedge-shaped part; 2712. Insert plate part; 2713. Insertion hole; 272. Protrusion part; 273. Control slide; 30. Spring seat; 31. Second barb part. Detailed Implementation

[0042] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0043] Example 1

[0044] like Figure 1 As shown, this embodiment discloses an electric toilet brush with a replaceable brush head, including a handle 11, as described above. Figure 3 As shown, a motor 17 is provided inside the handle 11. The power output shaft of the motor 17 is used to power connect with the brush head 12. The power output shaft includes the output shaft 171 of the motor 17 and a transmission shaft 18 coaxially connected to the output shaft 171. The transmission shaft 18 has a hollow structure. The transmission shaft 18 includes a first small diameter section 181, a large diameter section 182 and a second small diameter section 183 in sequence from top to bottom along the axial direction. The first small diameter section 181 is poweredly connected to the output shaft 171. The end of the second small diameter section 183 is exposed outside the handle 11 and is connected to the brush head 12. A clearance hole 20 is opened on the outer circular surface of the end of the second small diameter section 183.

[0045] like Figure 2 As shown, the brush head 12 includes a connecting seat 13 located on the inner side and opening upward, and a sponge 14 sleeved on the outer side of the connecting seat 13. The inner opening of the connecting seat 13 forms an assembly groove 15 adapted to the second small diameter section 183. A fixing hole 16 is provided on the groove wall of the assembly groove 15. The second small diameter section 183 is provided with a fixing member for cooperating with the fixing hole 16 and a control mechanism that can disengage the fixing member from the fixing hole 16. A first thrust member is provided between the bottom wall of the assembly groove 15 and the end of the second small diameter section 183 away from the handle 11. The first thrust member is a first thrust spring 21. The clearance hole 20 corresponds to the fixing hole 16 so that the brush head 12 is connected to the drive shaft 18 through the fixing member.

[0046] After the brush head 12 is installed, the protrusion 272 passes through the relief hole 20 and is embedded in the fixing hole 16, thereby causing the brush head 12 to compress the first thrust spring 21 through the connecting seat 13.

[0047] like Figure 9 As shown, the fixing member consists of two locking blocks 27 that are inserted into each other along the radial direction of the drive shaft 18. The two locking blocks 27 can slide simultaneously along the radial direction of the drive shaft 18 to move away from or towards each other. Each locking block 27 includes a mating part 271 located at one end close to each other and a protrusion 272 located at one end far from each other. The volume of the protrusion 272 is smaller than the volume of the mating part 271. The cross-sectional shape of the fixing hole 16 and the relief hole 20 are the same as the cross-sectional shape of the protrusion 272. The protrusion 272 can pass through the relief hole 20 and be embedded in the fixing hole 16. The mating part 271 includes a wedge-shaped part 2711 and an insert plate part 2712 arranged symmetrically. An insertion hole 2713 is provided in the wedge-shaped part 2711 of one locking block 27 for the insert plate part 2712 of the other locking block 27 to be inserted. The insertion hole 2713 can be a through hole or a blind hole, which is not limited here.

[0048] The locking block 27 is located inside the second minor diameter section 183 and is limited and supported by the axial inner wall of the second minor diameter section 183. The handle 11 is provided with a control structure for controlling the two locking blocks 27 to move away from or closer to each other near the first minor diameter section 181.

[0049] like Figure 4 , Figure 6 , Figure 7 As shown, the control structure, along the axial direction, includes, in sequence, a coil 22 disposed between the first small diameter section 181 and the inner wall of the handle 11, an inner core 23 slidable axially within the first small diameter section 181, a sliding member 24 disposed at the end of the inner core 23 away from the coil 22, and a control slider 26 for sliding connection with the locking block 27. The coil 22 includes a ring-shaped outer shell and copper wire spirally wound on the outer circumferential surface of the ring-shaped outer shell. The inner hole of the ring-shaped outer shell allows the inner core 23 to pass through. When the copper wire is energized, a Lorentz force is generated, thereby giving the inner core 23 kinetic energy in the axial direction. The coil 22 moves along the axial direction of the handle 11. The inner core 23 is made of a ferromagnetic material. The magnetic poles of the sliding member 24 and the coil 22 are different at their closest points. The control slider 26 and the sliding member 24 are interlocked and threaded together to maintain synchronous sliding between them. The large diameter section 182 is provided with a second thrust member for enabling the control slider 26 to slide axially toward the locking block 27. The second thrust member is a second thrust spring 25. One end of the second thrust spring 25 abuts against the shoulder formed between the first small diameter section 181 and the large diameter section 182, and the other end of the second thrust spring 25 abuts against the upper end face of the sliding member 24.

[0050] To facilitate users in controlling the electrical properties of the coil 22, the handle 11 may be equipped with electrical control units such as control buttons, control knobs, and control touch screens that are identical to those in the prior art, and no limitation is made here.

[0051] When coil 22 is energized, it generates a magnetic field. The magnetic force generated by coil 22 and the magnetic force between the slider 24 constitute the first traction force. Since the inner core 23 is made of a ferromagnetic material, there is still a magnetic force between the inner core 23 and the slider 24 in the normal state. The inner core 23 and the slider 24 together form an inverted T-shaped permanent magnet and extend into the coil 22 to increase the magnetic flux after the coil 22 is energized. The second traction force is between the inner core 23 and the slider 24. The thrust of the second thrust spring 25 is less than the sum of the first traction force and the second traction force.

[0052] like Figure 8 As shown, two locking blocks 27 are provided with control slides 273 on both sides of the sliding direction. The control slides 273 are inclined linear slides. The end of the control slide 273 near the control slider 26 is located near the protrusion 272, and the end of the control slide 273 away from the control slider 26 is located away from the protrusion 272, thus forming an inclined slide that gradually tilts towards the protrusion 272 from bottom to top.

[0053] like Figure 10 As shown, the control slider 26 has at least two ears 261 extending to both sides in the sliding direction of the two locking blocks 27. An obstacle space 263 is formed between the two ears 261 that can be fitted with the two locking blocks 27. A control slider 262 is provided on the inner side of the two ears 261 and embedded in the control slide 273.

[0054] When the brush head 12 is in the locked state, the first thrust spring 21 is in the compressed state, the protrusion 272 passes through the clearance hole 20 and is embedded in the fixing hole 16, and the second thrust spring 25 makes the control slider 26 in the lower limit position. The control slider 26 makes the two locking blocks 27 in a position away from each other through the control slide rod 262 and the control slide 273. At this time, the sliding member 24 and the inner core 23 are both in the lower limit position.

[0055] When the brush head 12 needs to be replaced, the coil 22 is energized. The Lorentz force generated by the coil 22 drives the inner core 23 to move upward axially. Since the magnetic force on the sliding member 24 is greater than the elastic force of the second thrust spring 25 at this time, the sliding member 24 and the control slider 26 are driven to slide upward. While the sliding member 24 moves upward axially, it pushes the inner core 23 to move upward synchronously. The control slider 262 slides relative to the control slide rail 273. The control slide rail 273 converts the axial tension of the control slider 262 into a radial force, thereby driving the two locking blocks 27 to slide radially inward until the two locking blocks 27 are in a position close to each other. In this state, the protrusion 272 retracts into the second small diameter section 183, so that the connecting seat 13 is unlocked from the axial end of the second small diameter section 183. At this time, the first thrust spring 21 restores its own elastic deformation and causes the connecting seat 13 to push the sponge 14 out, thereby completing the replacement of the brush head 12.

[0056] Example 2

[0057] The difference between this embodiment and Embodiment 1 is that the coil 22 is made of copper wire and is spirally wound along the axial direction on the outer circular surface of the inner core 23.

[0058] The magnetic force generated by coil 22 and the magnetic force between the slider 24 constitute the first traction force, the inner core 23 and the slider 24 constitute the second traction force, and the thrust of the second thrust spring 25 is less than the first traction force.

[0059] When the coil 22 is energized, the inner core 23 becomes magnetic. The inner core 23 attracts the slider 24 through one end close to the slider 24, thereby causing the slider 24 to move upward along the axis and compressing the second thrust spring 25.

[0060] Example 3

[0061] The difference between this embodiment and Embodiments 1 and 2 is that: Figure 2 , Figure 5 As shown, the second small diameter section 183 is further provided with a first barb portion 184 at the end away from the handle 11. The first barb portion 184 includes a support portion 1841 extending downward from the axial end face of the second small diameter section 183 and a stop portion 1842 provided on the support portion 1841. The support portions 1841 are arranged in a ring array, and there is a gap required for deformation between two adjacent support portions 1841. The stop portion 1842 is hook-shaped and radially outward. A spring seat 30 is provided in the mounting groove 15. A first thrust spring 21 is provided between the spring seat 30 and the axial end face of the second small diameter section 183. The opening of the spring seat 30 is provided with a second barb portion 31 for cooperating with the stop portion 1842.

[0062] When the brush head 12 is in the locked state, the protrusion 272 passes through the relief hole 20 and is embedded in the fixing hole 16. The first thrust spring 21 is in a compressed state, which causes the spring seat 30 to abut against the axial end face of the second small diameter section 183. The second barb 31 is located axially above the stop part 1842.

[0063] When the brush head 12 needs to be replaced, the coil 22 is energized to unlock the locking block 27. At this time, the first thrust spring 21 restores its elastic deformation and pushes the spring seat 30. The spring seat 30 slides axially until the second barb part 31 abuts against the stop part 1842 and stops sliding. Then, the connecting seat 13 separates from the spring seat 30 by inertia and drives the sponge 14 to pop out, thus completing the replacement of the brush head 12. Compared with the method of replacing the spring together, it can save the user the consumable cost when replacing the brush head 12.

Claims

1. An electric toilet brush with replaceable brush head, comprising a handle, wherein a motor is mounted on the handle, and the power output shaft of the motor is used for power connection with the brush head, characterized in that: The brush head has an opening that matches the power output shaft of the motor. A fixing hole is provided in the wall of the mounting groove. The power output shaft has a fixing member for engaging with the fixing hole. The handle has a control mechanism that allows the fixing member to slide towards the axis of the power output shaft and disengage from the fixing hole. When the fixing member is located in the fixing hole, it can prevent the brush head from sliding relative to the axial direction of the power output shaft through its own structural strength.

2. The electric toilet brush with replaceable brush head according to claim 1, characterized in that: A first thrust member is provided between the inner wall of the assembly groove and the power output shaft. When the control mechanism is activated, it can control the fixing member to slide along the axial position of the fixing hole. After the fixing member is separated from the fixing hole, the first thrust member can apply an axial force to the brush head to make the brush head separate from the power output shaft.

3. An electric toilet brush with a replaceable brush head according to claim 1 or 2, characterized in that: The power output shaft includes the output shaft of the motor and a transmission shaft coaxially connected to the output shaft. The end of the transmission shaft that is axially exposed on the handle has a clearance hole for the fixing member to be exposed. The clearance hole corresponds to the fixing hole. The fixing member has at least one upper end face located in the axial direction that abuts against the upper hole wall of the fixing hole, so that the brush head is connected to the transmission shaft through the fixing member.

4. An electric toilet brush with a replaceable brush head according to claim 3, characterized in that: The fixing member consists of two locking blocks that are inserted into each other along the radial direction of the drive shaft. The two locking blocks can slide simultaneously along the radial direction of the drive shaft to move away from or towards each other. The ends of the two locking blocks that are away from each other are provided with protrusions, which can pass through the clearance hole and be embedded in the fixing hole.

5. An electric toilet brush with a replaceable brush head according to claim 4, characterized in that: The drive shaft has a hollow structure and includes a first small diameter section, a large diameter section and a second small diameter section in sequence along the axial direction. The first small diameter section is poweredly connected to the output shaft. The clearance hole is provided on the second small diameter section. The locking block is located inside the second small diameter section and is limited and supported by the axial inner wall of the second small diameter section. The handle is provided with a control structure near the first small diameter section to control the two locking blocks to move away from or closer to each other.

6. An electric toilet brush with a replaceable brush head according to claim 5, characterized in that: The control structure includes, in sequence along the axial direction, a coil disposed between the first small diameter section and the inner wall of the handle, an inner core that can slide axially within the first small diameter section, a sliding member disposed at the end of the inner core away from the coil, and a control slider for sliding connection with the locking block. The sliding member is magnetic or can be magnetized. The control slider and the sliding member are interlocked to maintain synchronous sliding. A second thrust member is provided in the large diameter section to enable the control slider to slide axially toward the locking block.

7. An electric toilet brush with a replaceable brush head according to claim 6, characterized in that: When the coil is energized, a first traction force is generated between it and the sliding member. The inner core is made of a ferromagnetic material and generates a second traction force between it and the sliding member. The thrust of the second thrust member is less than the sum of the first traction force and the second traction force.

8. An electric toilet brush with a replaceable brush head according to claim 7, characterized in that: Both locking blocks include a mating portion located at one end close to each other and a protrusion located at one end far from each other. The volume of the protrusion is smaller than the volume of the mating portion. The cross-sectional shape of the fixing hole and the clearance hole are the same as the cross-sectional shape of the protrusion.

9. An electric toilet brush with a replaceable brush head according to claim 8, characterized in that: The two locking blocks have control slides on their two end faces in the sliding direction. The control slides are inclined. The end of the control slide near the control slider is located near the protrusion, and the end of the control slide away from the control slider is located away from the protrusion.

10. An electric toilet brush with a replaceable brush head according to claim 9, characterized in that: The control slider has at least two ears extending to both sides in the sliding direction of the two locking blocks, and a control slider is provided on the inner side of the two ears and embedded in the control slide.

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