A car elevator operating hoisting device

Abstract

The application discloses a kind of car elevator operation traction device, including, brake base, electromagnet device, traction wheel, brake shoe, brake device, auxiliary device, fitting protection device, fitting is set on the brake shoe, alarm device, the application is driven brake shoe by brake device and brake device and is released brake to traction wheel, guarantee the safe operation of elevator, and brake device drives limit communication structure synchronous motion to match the thickness of brake shoe in real time, so that when the thickness of brake shoe reaches preset value, electromagnet structure is energized, fitting protection device is fixed after being released under the magnetic force of electromagnet structure and moves a certain distance on brake shoe and is re-embedded fixed, to brake protection to traction wheel, avoid the safe operation of car elevator in the time when alarm device occurs warning, also avoid the influence to personnel and normal transportation of goods.

Description

Technical Field

[0001] This invention relates to the field of elevator traction technology, and more specifically to an elevator traction device. Background Technology

[0002] A car elevator is a device used to carry and transport people and goods. It uses a traction device to pull the elevator car up and down to carry and transport people, goods and equipment, and is responsible for safety braking.

[0003] In traditional car elevators, the traction system typically uses a brake arm to continuously release and engage the brake when braking or releasing the car. This creates constant contact between the brake shoes and the traction sheave. After prolonged braking, the thickness of the brake shoe on the side that brakes the traction sheave thins due to friction. This increases the working path of the brake arm clamping the traction sheave, while simultaneously lengthening the compression spring, resulting in a decrease in clamping force. This affects the overspeed protection function. Current solutions include adding an alarm device that triggers when the brake shoe thickness reaches a certain level to prevent compromised elevator safety. However, this alarm method only serves as a reminder and does not guarantee the safe operation of the elevator. An elevator stoppage, on the other hand, will disrupt the normal transport of people or goods. Summary of the Invention

[0004] The purpose of this invention is to provide a traction device for elevator cars, which solves the problem that existing traction devices can only prompt staff to replace brake shoes through alarms, but cannot guarantee the safe operation of elevator cars.

[0005] To solve the above-mentioned technical problems, the present invention specifically provides the following technical solution:

[0006] A traction device for a car elevator includes:

[0007] Brake base;

[0008] An electromagnet device is mounted on the brake base and generates magnetic force on both sides when energized.

[0009] The traction sheave is mounted on the brake base and is mounted downwards on the brake base along the same vertical line as the electromagnet device;

[0010] Two brake shoes are provided and are rotatably mounted on the brake base and located on both sides of the traction sheave, for contacting the surface of the traction sheave for braking;

[0011] A brake device is mounted on the brake base and located on both sides of the electromagnet device. The two brake shoes are pulled by the magnetic force of the electromagnet device to rotate away from the traction sheave to both sides.

[0012] A braking device is provided on the brake base and located on both sides of the electromagnet device, and the holding brake device is located between the braking device and the electromagnet device. The braking device is used to undergo elastic deformation when the holding brake device moves away from the traction sheave, and to push the holding brake device to drive the brake shoe to contact the traction sheave for braking when the electromagnet device is de-energized.

[0013] The auxiliary device includes a limiting connection structure and an electromagnetic structure. The limiting connection structure is installed on the brake device and, when the brake shoe wears to a preset value, it follows the brake device to reset the traction wheel to the limit position and connects the electromagnetic structure and the power supply. The electromagnetic structure is installed on the brake shoe and generates electromagnetic force after being energized.

[0014] The engagement protection device is fitted onto the brake shoe and, under the magnetic force of the electromagnetic structure, disengages from the engagement connection with the brake shoe in the direction closer to the traction wheel. After moving a certain distance on the brake shoe by the magnetic force of the electromagnetic structure, it re-engages and fixes itself to the brake shoe to contact the traction wheel for braking.

[0015] An alarm device is connected to the electromagnetic structure, and is on the same circuit as the electromagnetic structure and is simultaneously powered on to generate an alarm.

[0016] As a preferred embodiment of the present invention, the brake shoe includes a brake swing arm rotatably connected to the brake base, and a brake shoe is provided on the side of the brake swing arm facing the traction sheave;

[0017] One end of the brake swing arm is rotatably connected to the brake base, and the other end of the brake swing arm is rotatably connected to the brake holding device. The brake shoe is brought into contact with or disengaged from the traction wheel by the traction of the brake holding device. The electromagnetic structure and the engagement protection device are both installed on the brake swing arm.

[0018] As a preferred embodiment of the present invention, the limiting and connecting structure includes a conductive rod disposed on the brake device and connected to a power source. A wire with an exposed internal core at one end is connected to the conductive rod, and a magnetic plate is connected to the end of the wire. A conductive plate for contacting the conductive rod is disposed on the brake base. When the brake shoe wears to a preset value, the conductive plate attracts the magnetic plate that resets with the brake device and contacts and connects with the end of the wire to transmit current to the electromagnetic structure.

[0019] In a preferred embodiment of the present invention, the conductive sheet can undergo elastic deformation along the direction of movement of the conductive rod when it comes into contact with the wire.

[0020] In a preferred embodiment of the present invention, an elastic rope is connected to the conductor, and the elastic rope binds the conductor to the conductive rod.

[0021] As a preferred embodiment of the present invention, the fitting protection device includes an outer connecting seat disposed on the side of the brake swing arm opposite to the traction sheave. The outer connecting seat is provided with a fitting groove penetrating the brake swing arm on the side facing the traction sheave. A sliding plate is slidably connected in the fitting groove. An auxiliary brake shoe is connected to one end of the sliding plate. Two strip-shaped grooves symmetrical about the center line are provided on both sides of the sliding plate. A first fitting structure and a second fitting structure for fitting and fixing the sliding plate are sequentially provided in the fitting groove and the two strip-shaped grooves along the movement direction of the sliding plate.

[0022] The first fitting structure is engaged on the sliding plate and, under the magnetic force of the electromagnetic structure, undergoes elastic deformation along the axis perpendicular to the sliding plate to release the fixation of the sliding plate. The sliding plate is then embedded into the fixed position within the second fitting structure under the magnetic force of the electromagnetic structure.

[0023] As a preferred embodiment of the present invention, the first fitting structure includes first grooves on opposite sides disposed in the fitting groove, each first groove is slidably connected to a retaining plate by a first spring, each retaining plate is provided with an inclined surface opposite to the movement direction of the sliding plate, and each strip groove is provided with a limiting roller that contacts the corresponding inclined surface.

[0024] As a preferred embodiment of the present invention, the second fitting structure includes second grooves disposed on opposite sides within the fitting groove. Each second groove is slidably connected to a limiting slide plate via a second spring. Each strip-shaped groove is provided with an arc-shaped protrusion for sliding contact with the limiting slide plate. The arc surface of the arc-shaped protrusion is recessed inward and faces the traction wheel. The side of the arc-shaped protrusion facing away from the traction wheel is a plane perpendicular to the center line of the sliding plate.

[0025] As a preferred embodiment of the present invention, the end of the limiting slide is rotatably connected to a rotating roller for contacting the arc-shaped protrusion surface.

[0026] As a preferred embodiment of the present invention, the end of the sliding plate is provided with an auxiliary spring that abuts against the inner bottom of the fitting groove, and the auxiliary spring is in a compressed deformation state when the limiting roller and the inclined surface come into contact.

[0027] Compared with the prior art, the present invention has the following advantages:

[0028] This invention uses a braking device and a holding brake device to drive the brake shoes to brake or release the traction sheave, ensuring the safe operation of the elevator. The holding brake device drives the limit connection structure to move synchronously to match the thickness of the brake shoes in real time. When the thickness of the brake shoes reaches a preset value, the electromagnetic structure is energized. Under the magnetic force of the electromagnetic structure, the locking protection device is released from fixation and moves a certain distance on the brake shoes towards the traction sheave before re-locking and fixing itself, thus braking and protecting the traction sheave. This avoids the safe operation of the elevator car during the period when the alarm device is triggered, and also avoids the impact on the normal transportation of personnel and materials. Attached Figure Description

[0029] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0030] Figure 1 This invention provides a schematic diagram of the structure of a traction device for a car elevator.

[0031] Figure 2 This invention provides a side sectional view of a traction device for a car elevator.

[0032] Figure 3 A side cross-sectional view of the fitting protection device is provided for an embodiment of the present invention;

[0033] Figure 4 Provided for embodiments of the present invention Figure 1 The diagram shows an enlarged view of part A.

[0034] The labels in the diagram represent the following:

[0035] 1-Brake base; 2-Electromagnet device; 3-Traction wheel; 4-Brake shoe; 5-Holding brake device; 6-Brake device; 7-Auxiliary device; 8-Closing protection device; 9-Protection device;

[0036] 401 - Brake swing arm; 402 - Brake shoe;

[0037] 701-Limiting and connecting structure; 702-Electromagnetic structure; 703-Conductive rod; 704-Wire; 705-Magnetic sheet; 706-Conductive sheet; 707-Elastic rope;

[0038] 801-External connecting seat; 802-Matching groove; 803-Sliding plate; 804-Auxiliary brake shoe; 805-Strip groove; 806-First mating structure; 807-Second mating structure; 808-First groove; 809-First spring; 810-Clamping plate; 811-Inclined surface; 812-Limiting roller; 813-Second groove; 814-Second spring; 815-Limiting slide plate; 816-Arched protrusion; 817-Rotating roller; 818-Auxiliary spring. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] like Figures 1 to 4 As shown, the present invention provides a traction device for a car elevator, comprising:

[0041] Brake base 1.

[0042] Electromagnet device 2 is mounted on brake base 1 and generates magnetic force on both sides by energizing it.

[0043] The traction sheave 3 is mounted on the brake base 1 and is mounted downwards on the brake base 1 along the same vertical line as the electromagnet device 2.

[0044] Two brake shoes 4 are provided and are rotatably mounted on the brake base 1 and located on both sides of the traction wheel 3, for contacting the surface of the traction wheel 3 for braking.

[0045] The brake device 5 is mounted on the brake base 1 and located on both sides of the electromagnet device 2. It uses the magnetic force of the electromagnet device 2 to pull the two brake shoes 4 to rotate away from the traction wheel 3.

[0046] The braking device 6 is mounted on the brake base 1 and located on both sides of the electromagnet device 2. The holding brake device 5 is located between the braking device 6 and the electromagnet device 2. The braking device 6 is used to undergo elastic deformation when the holding brake device 5 is away from the traction sheave, and pushes the holding brake device 5 to drive the brake shoe to contact the traction sheave 3 for braking when the electromagnet device 2 is de-energized.

[0047] The auxiliary device 7 includes a limiting connection structure 701 and an electromagnetic structure 702. The limiting connection structure 701 is installed on the brake device 5 and, when the brake shoe 4 wears to a preset value, it follows the brake device 5 to reset the brake traction wheel 3 to the limit position to connect the electromagnetic structure 702 and the power supply. The electromagnetic structure 702 is installed on the brake shoe 4 and generates electromagnetic force after being energized.

[0048] The engagement protection device 8 is engaged on the brake shoe 4 and, under the magnetic force of the electromagnetic structure 702, disengages from the engagement connection with the brake shoe 4 in the direction closer to the traction wheel. After moving a certain distance on the brake shoe 4 by the magnetic force of the electromagnetic structure 702, it re-engages and fixes itself to the brake shoe 4 to contact the traction wheel 3 for braking.

[0049] Alarm device 9 is connected to electromagnetic structure 702, and is on the same circuit as electromagnetic structure 702 and is powered on at the same time to generate an alarm.

[0050] When in use, the brake base 1 is installed inside the elevator shaft. When the elevator car is moving up and down, the electromagnet device 2 is energized and generates electromagnetic force to drive the brake device 5 away from the sides of the electromagnet device 2. This causes the two brake shoes 4 to rotate towards the sides of the traction wheel 3 under the traction of the brake device 5 to release the brake on the traction wheel 3, so that the elevator car can move up and down normally. At the same time, the brake device 6 undergoes compression elastic deformation under the movement of the brake device 5.

[0051] When the elevator car needs to be braked for safety, the electromagnet device 2 is de-energized, and the elastic force of the braking device 6 drives the brake device 5 to rotate the brake shoes 4, so that the two brake shoes 4 gradually approach the traction sheave 3 until they make contact and brake.

[0052] After the brake shoe 4 comes into contact with the surface of the traction sheave 3 repeatedly over a long period of time, it will wear down, causing the thickness of the brake shoe 4 to gradually decrease. This will gradually increase the travel of the brake shoe 4 during reset, and consequently, the braking effect of the brake shoe 4 will gradually deteriorate.

[0053] When the thickness of the brake shoe 4 becomes thinner to a preset value, the limiting connection structure 701 in the auxiliary device 7 moves synchronously with the brake device 5. Due to the wear of the brake shoe 4, the minimum distance between the part of the brake device 5 located near the electromagnet device 2 and the electromagnet device 2 becomes smaller and smaller. When the thickness of the brake shoe 4 reaches the preset value, the limiting connection structure 701 connects the electromagnetic structure 702 and the power supply, so that the electromagnetic structure 702 is energized and the limiting connection structure 701 plays a conductive connection role.

[0054] When the electromagnetic structure 702 is energized, it generates electromagnetic force. Under the action of the electromagnetic force of the electromagnetic structure 702, the locking protection device 8 is driven to disengage from the locking connection with the brake shoe 4 and moves towards the traction sheave 3 on the brake shoe 4. Under the action of the electromagnetic force of the electromagnetic structure 702, it locks into another position of the brake shoe 4 to replace the brake shoe 4 in contact with the traction sheave 3 for braking. This avoids the problem of not being able to guarantee the safe operation of the elevator car when the braking effect fails after the brake shoe 4 wears down, and also avoids the problem of the elevator car stopping its movement after the brake shoe 4 wears down, affecting the normal transportation of personnel and materials. This allows the elevator car to continue to operate while waiting for the brake shoe 4 to be replaced.

[0055] The alarm device 9 is energized simultaneously with the electromagnetic structure 702 to issue a warning to the staff so that the brake shoe 4 can be replaced.

[0056] The brake shoe 4 includes a brake swing arm 401 rotatably connected to the brake base 1, and a brake shoe 402 is provided on the side of the brake swing arm 401 facing the traction wheel 3.

[0057] One end of the brake swing arm 401 is rotatably connected to the brake base 1, and the other end of the brake swing arm 401 is rotatably connected to the brake device 5. The brake swing arm 401 contacts or disengages from the traction wheel 3 through the traction brake shoe 402 of the brake device 5. The electromagnetic structure 702 and the engagement protection device 8 are both installed on the brake swing arm 401.

[0058] When the brake shoe 4 is in use, the brake device 5 moves under the electromagnetic force of the electromagnet device 2, which drives the brake swing arm 401 to rotate on the brake base 1. The brake shoe 402 moves synchronously to make contact with or move away from the traction wheel 3.

[0059] The limiting connection structure 701 includes a conductive rod 703 disposed on the brake device 5 and connected to the power supply. A wire 704 with an exposed internal core is connected to the conductive rod 703. A magnetic piece 705 is connected to the end of the wire 704. A conductive piece 706 is disposed on the brake base 1 for contacting the conductive rod 703. When the brake shoe 5 wears to a preset value, the conductive piece 706 attracts the magnetic piece 705 that follows the brake device 5 to reset and then contacts and connects with the end of the wire 704 to transmit current to the electromagnetic structure 702.

[0060] When the limit connection structure 701 is in use, when the brake shoe 402 wears to a preset value, the conductive rod 703 moves synchronously with the brake swing arm 401 toward the electromagnet device 2 until the wire 704 contacts the conductive plate 706. The magnetic plate 705 is attracted to the conductive plate 706 by magnetic force, ensuring effective contact between the wire 704 and the conductive plate 706. This allows the power supply to be connected to the electromagnetic structure 702 through the conductive rod 703, the wire 704, and the conductive plate 706, thereby energizing the electromagnetic structure 702 and the alarm device 9.

[0061] When the brake shoe 402 contacts the traction sheave 3, the electromagnetic structure 702 is energized after the wire 704 and the conductive sheet 706 are connected. This causes the engagement protection device 8 to engage with the brake swing arm 401 under the electromagnetic force of the electromagnetic structure 702, and move towards the traction sheave 3 until it contacts the surface of the traction sheave 3. At this time, the surface of the engagement protection device 8 used to brake the traction sheave 3 and the surface of the brake shoe 402 used to brake the traction sheave 3 are in the same position.

[0062] When the brake on the traction sheave 3 is released, the brake swing arm 401 drives the limiting connection structure 701 away from the traction sheave 3. Under the attraction of the magnetic plate 705 and the conductive plate 706, the wire 704 maintains contact with the conductive plate 706 as the brake swing arm 401 moves a certain distance away from the traction sheave 3. This ensures that the electromagnetic structure 702 remains energized for a period of time during the reset movement. Under the electromagnetic force of the electromagnetic structure 702, the engagement protection device 8 continues to move towards the traction sheave 3 until it engages with another position of the brake swing arm 401 and is fixed. This ensures that the distance between the position on the engagement protection device 8 used to brake the traction sheave 3 and the traction sheave 3 is less than the distance between the brake shoe 402 and the traction sheave 3, thereby ensuring safe and effective braking of the traction sheave 3.

[0063] When the conductive sheet 706 comes into contact with the wire 704, it can undergo elastic deformation along the direction of movement of the conductive rod 703.

[0064] Because the amount of wear on the brake shoe 402 varies each time, when the wire 704 on the conductive rod 703 comes into contact with the conductive sheet 706, the travel of the conductive rod 703 will exceed the position of the conductive sheet 706. The conductive sheet 706 can undergo elastic deformation to avoid damage during contact.

[0065] An elastic rope 707 is connected to the conductor 704, and the elastic rope 707 binds the conductor 704 to the conductive rod 703.

[0066] The wire 704 is secured by the elastic rope 707 to prevent it from swinging and coming into contact with the conductive sheet 706 when the traction wheel 3 is braked after the engagement protection device 8 is adjusted in position, which would cause the electromagnetic structure 702 to be energized and heat up, resulting in related faults or problems.

[0067] Secondly, the elastic rope 707 is elastic in itself. When the conductor 704 moves away from the traction wheel 3 after contacting the conductive plate 706, the magnetic force of the magnetic plate 705 pulls the elastic rope 707 to deform, ensuring the normal power supply of the electromagnetic structure 702.

[0068] The engagement protection device 8 includes an outer connecting seat 801 disposed on the side of the brake swing arm 401 facing away from the traction sheave 3. The outer connecting seat 801 is provided with an engagement groove 802 that penetrates the brake swing arm 401 on the side facing the traction sheave 3. A sliding plate 803 is slidably connected in the engagement groove 802. An auxiliary brake shoe 804 is connected to one end of the sliding plate 803. Two strip-shaped grooves 805 symmetrical about the center line are provided on both sides of the sliding plate 803. A first engagement structure 806 and a second engagement structure 807 for engaging and fixing the sliding plate 803 are arranged sequentially in the engagement groove 802 and the two strip-shaped grooves 805 along the movement direction of the sliding plate 803.

[0069] The first fitting structure 806 is engaged on the sliding plate 803, and under the magnetic force of the electromagnetic structure 702, it undergoes elastic deformation along the axis perpendicular to the sliding plate 803 to release the fixation of the sliding plate 803. Under the magnetic force of the electromagnetic structure 702, the sliding plate 803 is embedded in the fixed position within the second fitting structure 807.

[0070] When the engagement protection device 8 is in use, the initial position of the sliding plate 703 is in the engagement groove 802 and is fixed by the first engagement structure 806. At this time, the electromagnetic structure 702 is not energized, and the auxiliary brake shoe 804 does not contact the traction wheel 3 when the brake shoe 702 contacts the traction wheel 3.

[0071] When the electromagnetic structure 702 is energized, the sliding plate 803 disengages from the first fitting structure 806 through the electromagnetic force generated by the electromagnetic structure 702, and slides along the fitting groove 802 toward the traction wheel 3 to the second fitting structure 807. At this time, the auxiliary brake shoe 804 comes into contact with the traction wheel 3.

[0072] When the brake swing arm 401 moves away from the traction wheel 3, the sliding plate 803 continues to move towards the traction wheel 3 under the electromagnetic force of the electromagnetic structure 702 until it is engaged in the fixed position within the second engagement structure 807, thus ensuring the stability of the auxiliary brake shoe 804 during use.

[0073] The slot 805 is provided to provide installation space for the first fitting structure 806 and the second fitting structure 807, so as to avoid interference with the movement of the sliding plate 803.

[0074] The external connector 801 is designed to extend the installation space.

[0075] The first fitting structure 806 includes first grooves 808 on opposite sides of the fitting groove 802. Each first groove 808 is slidably connected to a retaining plate 810 by a first spring 809. Each retaining plate 810 is provided with an inclined surface 811 opposite to the movement direction of the sliding plate 803. Each strip groove 805 is provided with a limiting roller 812 that contacts the corresponding inclined surface 811.

[0076] When the first fitting structure 806 is in use, the limiting roller 812 is located on the side of the clamping plate 812 away from the traction wheel 3, and the movement of the sliding plate 803 is restricted by the contact between the clamping plate 810 and the limiting roller 812.

[0077] When the electromagnetic structure 702 is energized, the sliding plate 803 drives the limiting roller 812 to roll along the surface of the inclined plane 811 under the action of the electromagnetic force generated by the electromagnetic structure 702, so that the clamping plate 810 compresses the first spring 809 and moves into the first groove 808 until the space between the two clamping plates 810 is sufficient for the limiting roller 812 to pass through.

[0078] By limiting the position of the sliding plate 803 through the first fitting structure 806, the traction wheel 3 is prevented from being braked when the brake shoe 402 is at a safe thickness.

[0079] Secondly, the inclined surface 711 ensures that the force exerted by the limiting roller 812 on the clamping plate 810 is directed toward the inner bottom of the first groove 808, thus guaranteeing that the clamping plate 810 can be driven to move under the action of electromagnetic force to release the restriction on the limiting roller 812.

[0080] The second fitting structure 805 includes second grooves 813 on opposite sides of the fitting groove 802. Each second groove 813 is slidably connected to a limiting slide plate 815 by a second spring 814. Each strip groove 805 is provided with an arc-shaped protrusion 816 for sliding contact with the limiting slide plate 815. The arc surface of the arc-shaped protrusion 816 is concave inward and faces the traction wheel 3. The side of the arc-shaped protrusion 816 away from the traction wheel 3 is a plane perpendicular to the center line of the sliding plate 803.

[0081] When in use, the second fitting structure 805 drives the sliding plate 803 to move and provides driving force through the electromagnetic force of the electromagnetic structure 702, so that the arc-shaped protrusion 816 contacts the limiting slide plate 815. Under the action of the electromagnetic force, the arc-shaped protrusion 816 drives the limiting slide plate 815 to compress the second spring 814 and move towards the inside of the second groove 813 until the arc-shaped protrusion 816 passes through to the side of the limiting slide plate 815 facing the traction wheel 3. Under the elastic force of the second spring 814, the limiting slide plate 815 resets and restricts the arc-shaped protrusion 816 to move in the opposite direction, thereby fixing the position of the sliding plate 803 and ensuring the stability of the auxiliary brake shoe 805 when braking the traction wheel 3.

[0082] The arc-shaped protrusion 816 can ensure that the limiting slide plate 815 can be driven to move under the action of moving towards the bottom of the second groove 813.

[0083] Furthermore, the side of the arc-shaped protrusion 816 facing away from the traction wheel 3 is a flat surface, which increases the contact area between it and the limiting slide plate 815, thereby improving the stability of the sliding plate 803 during use.

[0084] Furthermore, in this embodiment, the arc-shaped protrusion 816 abuts against the side wall of the fitting groove 802 after passing through the limiting slide plate 815 to the other side, ensuring that the sliding plate 803 is fixed.

[0085] The end of the limiting slide plate 815 is rotatably connected to a roller 817 for contacting the surface of the arc-shaped protrusion 816.

[0086] By setting the rotating roller 817 to contact the surface of the arc-shaped protrusion 816, the frictional force during contact is reduced.

[0087] The end of the sliding plate 803 is provided with an auxiliary spring 818 that abuts against the inner bottom of the fitting groove 802, and the auxiliary spring 818 is in a compressed deformation state when the limiting roller 812 and the inclined surface 811 come into contact.

[0088] The elastic force of the auxiliary spring 818 further ensures that the arc-shaped protrusion 816 can drive the limiting slide plate 815 to compress the second spring 814 and move to the other side of the limiting slide plate 815 to be fixed.

[0089] The above embodiments are merely exemplary embodiments of this application and are not intended to limit this application. The scope of protection of this application is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to this application within its substance and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of this application.

Claims

1. A traction device for a car elevator, characterized in that, include: Brake base (1); An electromagnet device (2) is installed on the brake base (1) and generates electromagnetic force on both sides by energizing it; The traction wheel (3) is mounted on the brake base (1) and is mounted downwards on the brake base (1) along the same vertical line as the electromagnet device (2); Two brake shoes (4) are provided and are rotatably mounted on the brake base (1) and located on both sides of the traction wheel (3) for contacting the surface of the traction wheel (3) for braking; The brake device (5) is set on the brake base (1) and located on both sides of the electromagnet device (2). The two brake shoes (4) are pulled by the electromagnetic force of the electromagnet device (2) to rotate away from the traction wheel (3) to both sides. A braking device (6) is provided on the brake base (1) and located on both sides of the electromagnet device (2), and the holding brake device (5) is located between the braking device (6) and the electromagnet device (2). The braking device (6) is used to undergo elastic deformation when the holding brake device (5) moves away from the traction wheel, and push the holding brake device (5) to drive the brake shoe to contact the traction wheel (3) for braking when the electromagnet device (2) is de-energized. The auxiliary device (7) includes a limiting connection structure (701) and an electromagnetic structure (702). The limiting connection structure (701) is disposed on the brake device (5) and is used to reset the brake device (5) to the limit position when the brake shoe (4) is worn to a preset value, and to connect the electromagnetic structure (702) to the power supply. The electromagnetic structure (702) is disposed on the brake shoe (4) and generates electromagnetic force after being energized. The fitting protection device (8) is fitted onto the brake shoe (4) and, under the electromagnetic force of the electromagnetic structure (702), disengages from the fitting connection with the brake shoe (4) in the direction closer to the traction wheel. After moving a certain distance on the brake shoe (4) by the electromagnetic force of the electromagnetic structure (702), it refits and fixes itself to the brake shoe (4) to contact the traction wheel (3) for braking. An alarm device (9) is connected to the electromagnetic structure (702) and is on the same circuit as the electromagnetic structure (702) and is powered on at the same time to generate an alarm.

2. The traction device for a car elevator according to claim 1, characterized in that, The brake shoe (4) includes a brake swing arm (401) rotatably connected to the brake base (1), and a brake shoe (402) is provided on the side of the brake swing arm (401) facing the traction wheel (3). One end of the brake swing arm (401) is rotatably connected to the brake base (1), and the other end of the brake swing arm (401) is rotatably connected to the brake device (5). The brake shoe (402) is brought into contact with or disengaged from the traction wheel (3) by the traction of the brake device (5). The electromagnetic structure (702) and the engagement protection device (8) are both installed on the brake swing arm (401).

3. The traction device for a car elevator according to claim 1, characterized in that, The limiting connection structure (701) includes a conductive rod (703) disposed on the brake device (5) and connected to the power supply. A wire (704) with an exposed internal core is connected to the conductive rod (703). A magnetic piece (705) is connected to the end of the wire (704). A conductive piece (706) for contacting the conductive rod (703) is disposed on the brake base (1). When the brake shoe (4) is worn to a preset value, the conductive piece (706) attracts the magnetic piece (705) that follows the reset of the brake device (5) and contacts and connects with the end of the wire (704) to transmit current to the electromagnetic structure (702).

4. The traction device for a car elevator according to claim 3, characterized in that, When the conductive sheet (706) comes into contact with the wire (704), it can undergo elastic deformation along the direction of movement of the conductive rod (703).

5. The traction device for a car elevator according to claim 3, characterized in that, An elastic rope (707) is connected to the conductor (704), and the elastic rope (707) binds the conductor (704) to the conductive rod (703).

6. The traction device for a car elevator according to claim 2, characterized in that, The fitting protection device (8) includes an outer connecting seat (801) disposed on the side of the brake swing arm (401) away from the traction sheave (3). The outer connecting seat (801) is provided with a fitting groove (802) penetrating the brake swing arm (401) on the side facing the traction sheave (3). A sliding plate (803) is slidably connected in the fitting groove (802). An auxiliary brake shoe (804) is connected to one end of the sliding plate (803). Two strip-shaped grooves (805) symmetrical about the center line are provided on both sides of the sliding plate (803). A first fitting structure (806) and a second fitting structure (807) for fitting and fixing the sliding plate (803) are arranged sequentially in the fitting groove (802) and the two strip-shaped grooves (805) along the movement direction of the sliding plate (803). The first fitting structure (806) is mounted on the sliding plate (803) and, under the electromagnetic force of the electromagnetic structure (702), undergoes elastic deformation along the axis perpendicular to the sliding plate (803) to release the fixation of the sliding plate (803). The sliding plate (803) is then embedded in the second fitting structure (807) at a fixed position under the magnetic force of the electromagnetic structure (702).

7. A traction device for a car elevator according to claim 6, characterized in that, The first fitting structure (806) includes first grooves (808) on opposite sides in the fitting groove (802). Each first groove (808) is slidably connected to a retaining plate (810) by a first spring (809). Each retaining plate (810) is provided with an inclined surface (811) opposite to the movement direction of the sliding plate (803). Each strip groove (805) is provided with a limiting roller (812) that contacts the corresponding inclined surface (811).

8. A traction device for a car elevator according to claim 6, characterized in that, The second fitting structure (807) includes second grooves (813) on opposite sides of the fitting groove (802). Each second groove (813) is slidably connected to a limiting slide plate (815) by a second spring (814). Each strip groove (805) is provided with an arc-shaped protrusion (816) for sliding contact with the limiting slide plate (815). The arc surface of the arc-shaped protrusion (816) is recessed inward and faces the traction wheel (3). The side of the arc-shaped protrusion (816) away from the traction wheel (3) is a plane perpendicular to the center line of the sliding plate (803).

9. A traction device for a car elevator according to claim 8, characterized in that, The end of the limiting slide plate (815) is rotatably connected to a roller (817) for contacting the surface of the arc-shaped protrusion (816).

10. A traction device for a car elevator according to claim 7, characterized in that, The end of the sliding plate (803) is provided with an auxiliary spring (818) that abuts against the inner bottom of the fitting groove (802), and the auxiliary spring (818) is in a compressed deformation state when the limiting roller (812) and the inclined surface (811) come into contact.

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