An off-line detection method for electromagnetic force size of elevator brake band brake

Abstract

The application discloses an offline detection method for the electromagnetic force of an elevator brake holding brake, and comprises the following steps: S1, removing the original bolts and brake shoes on the static iron block and the dynamic iron block; S2, using the first static iron bolt to position the static iron block and the dynamic iron block on the detection table of a pressure detector; S3, using the second dynamic iron bolt hole to cooperate with the second dynamic iron bolt to install the separation plate on the dynamic iron block; S4, installing the top rod on the pressure head of the pressure detector in the second static iron bolt hole; S5, installing the gasket in the air gap of the holding brake; S6, electrifying the holding brake on the detection table, so that the dynamic iron block is attracted to the static iron block; S7, starting the pressure detector to press down the top rod until the dynamic iron block is separated from the static iron block, and recording the final pressure display value on the pressure detector. The original bolt holes on the static iron block and the dynamic iron block are used in cooperation with the pressure detector, the static iron block and the dynamic iron block are separated through the top rod and the separation plate, and thus the electromagnetic force of the holding brake separation is obtained. The method is simple and easy to control, the detection result is accurate, and the cost is low.

Description

Technical Field

[0001] This invention relates to the field of elevator brake technology, and in particular to an offline method for detecting the magnitude of the electromagnetic force of an elevator brake. Background Technology

[0002] The elevator market is becoming increasingly competitive, and the electromagnetic attraction force of the block brakes in elevators produced by various manufacturers is gradually approaching its critical point. In practical applications, changes in the electromagnetic attraction force of the brake often lead to malfunctions such as the brake failing to open, incomplete opening, asynchronous opening, and brake dragging. Therefore, when repairing or replacing brake parts, it is usually necessary to test the critical electromagnetic force at which the moving iron block separates from the stationary iron block to verify the actual electromagnetic attraction force of the brake.

[0003] As per the instruction manual Figure 1 and attached Figure 2 As shown, a pair of brakes 100 of the electromagnetic elevator brake are installed on both sides of the drive wheel 101. Each pair of brakes 100 includes a pair of stationary iron blocks 102 and moving iron blocks 103. A return spring (not shown) is installed in the air gap 104 between the stationary iron blocks 102 and the moving iron blocks 103. An electromagnetic coil is built into the stationary iron block 102. A brake shoe 105 is installed on the side of the moving iron block 103 facing the drive wheel 101. When the brake 100 is energized, the moving iron block 103 attracts the stationary iron block 102 and drives the brake shoe 105 to release the drive wheel 101. When the power is off, the electromagnetic force of the brake 100 disappears, and the return spring opens the moving iron block 103, thereby driving the brake shoe 105 to grip the drive wheel 101, thus realizing the function of automatic braking of the elevator brake when the power is off.

[0004] Normally, the stationary iron block 102 of the brake originally has five screw holes, while the moving iron block 103 originally has eight screw holes.

[0005] The stationary iron block 102 is installed and fixed to the entire brake 100 through four first stationary iron screw holes 102a at the four corners of its edge, and cooperates with the first stationary iron bolts 102b; at the same time, a second stationary iron screw hole 102c is also provided in the center of the stationary iron block 102, which penetrates the tight iron block 102 and cooperates with the second stationary iron bolt 102d (i.e., the brake release bolt).

[0006] The moving iron block 103 is connected to the stationary iron block 102 through the corresponding first moving iron screw hole 103a and the first moving iron bolt 103b. The first moving iron bolt 103b is a hollow bolt fitted on the first stationary iron bolt 102b, so that when the power is off, the moving iron block 103 can slide on the first moving iron bolt 103b (with the help of the return spring, the moving iron block 103 can pop out when the power is off, thereby realizing automatic braking). At the same time, four second moving iron screw holes 103c are also provided on the inner side of the moving iron block 103. The second moving iron screw holes 103c are used to cooperate with the second moving iron bolt 103d to install and fix the brake shoe 105.

[0007] Currently, there are many methods for testing the electromagnetic force of elevator brakes, but they are basically divided into two types: online testing and offline testing. Online testing schemes are more complex, involving more electronic devices, making them difficult to implement and costly. Traditional offline testing methods are relatively primitive, basically using a two-sided pulling scheme (fixing the stationary iron block 102 and the moving iron block 103 respectively, and then pulling them apart through an external device). This traditional offline testing scheme is not easy to control and the test results are inaccurate. Summary of the Invention

[0008] To address the shortcomings of existing technologies, this invention provides an offline detection method for the magnitude of the electromagnetic force of an elevator brake, thereby overcoming the deficiencies in existing technologies.

[0009] To achieve the above objectives, the present invention provides the following technical solution:

[0010] An offline method for detecting the magnitude of the electromagnetic force of an elevator brake includes the following steps:

[0011] S1. Remove the brake from the brake system and disconnect it from the ground. Then separate the stationary iron block and the moving iron block on the brake and remove the original bolts and brake shoes on the stationary iron block and the moving iron block.

[0012] S2. Using the first stationary iron bolt, the stationary iron block and the moving iron block are installed and positioned on the test platform of the pressure detector in a simulated online state, so that the moving iron block can slide on the first stationary iron bolt when the brake is not energized;

[0013] S3. Using the second moving iron screw hole and the second moving iron bolt, a separation plate is fastened to the moving iron block. The installation method and position of the separation plate simulate the installation of the brake shoe when online.

[0014] S4. Install the push rod on the pressure head of the pressure detector in the second static iron screw hole, so that the push rod abuts against the separation plate;

[0015] S6. Power the brake on the pressure detector test platform with the rated voltage to make the moving iron block attract the stationary iron block;

[0016] S7. Activate the pressure detector, causing the pressure head to slowly press down the push rod until the moving iron block breaks free from the electromagnetic force binding the stationary iron block and separates from the stationary iron block. Read and record the final pressure display value on the pressure detector.

[0017] Furthermore, step S2 further includes the following sub-steps:

[0018] S21. First, pass the first stationary iron bolt through the first stationary iron bolt hole;

[0019] S22. Then pass the first stationary iron bolt through the first moving iron bolt hole;

[0020] S23. Finally, position the assembled stationary iron block and moving iron block on the test platform of the pressure detector, and make the first stationary iron bolt abut against the test platform of the pressure detector.

[0021] Furthermore, a step S5 is included between steps S4 and S6:

[0022] S5. Place several shims symmetrically in the air gap between the stationary iron block and the moving iron block to create a certain gap between them.

[0023] Furthermore, the thickness of the gasket in step S5 is equal to the width of the maximum air gap when the brake is in the line.

[0024] Furthermore, in step S3, the four corners of the separation plate are provided with screw holes corresponding to the screw holes of the second moving iron, and the second moving iron bolt passes through the screw holes at the four corners of the separation plate and is screwed into the screw holes of the second moving iron.

[0025] Preferably, the outer diameter of the push rod on the pressure head of the pressure detector is smaller than the inner diameter of the second static iron screw hole.

[0026] Preferably, the outer diameter of the first stationary iron bolt is smaller than the inner diameter of the first moving iron bolt hole.

[0027] Preferably, the gasket in step S5 is made of a non-magnetic material; and the gasket is either two long strips or four short strips.

[0028] Preferably, the load-bearing capacity of the separation plate is 1.5 to 2 times or more the theoretically calculated value of the separation electromagnetic force when the brake leaves the factory.

[0029] Preferably, the pressure detector includes a pressure-bearing testing platform and a pressure head, with a top rod installed on the pressure head; the pressure detector is a standard part of a universal testing machine of model UTM5305X, and its measurement range is 0 to 300kN.

[0030] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0031] 1) The offline detection method for the electromagnetic force of the elevator brake in this case utilizes the original first stationary iron screw hole and first stationary iron bolt of the brake to install and fix the brake offline on the test platform of the pressure detector, thereby simulating the online state of the brake; the original second stationary iron screw hole of the brake is used to install the top rod of the pressure detector, which facilitates the detection work; the original second moving iron screw hole and second moving iron bolt of the brake are used to install the separation plate, so that the top rod and the separation plate cooperate to separate the moving iron block from the stationary iron block. Under the action of the pressure detector, the electromagnetic force value when the moving iron block of the brake separates from the stationary iron block can be read and recorded. Since the original components of the brake are fully utilized, the method is simple and easy to control, close to the online working state of the brake, the detection results are accurate, and the cost is low.

[0032] 2) In the offline detection method for the magnitude of the electromagnetic force of the elevator brake in this case, a shim is placed in the air gap between the stationary iron block and the moving iron block. The thickness of the shim is equal to the width of the maximum air gap when the brake is online, which makes the detection result closer to the online working state of the brake and further ensures the accuracy of the detection result.

[0033] To provide a clearer understanding of the present invention, the preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the elevator brake in the background art of this invention;

[0035] Figure 2 This is a schematic diagram of the brake structure in the background art of this invention;

[0036] Figure 3 This is a schematic diagram illustrating the working principle of the present invention.

[0037] Attached image labels:

[0038] 1-Separation plate, 2-Pressure head, 3-Push rod, 4-Washer; 100-Brake, 101-Drive wheel, 102-Stationary iron block, 103-Moving iron block, 104-Air gap, 105-Brake shoe; 102a-First stationary iron screw hole, 102b-First stationary iron bolt, 102c-Second stationary iron screw hole, 102d-Second stationary iron bolt; 103a-First moving iron screw hole, 103b-First moving iron bolt, 103c-Second moving iron screw hole, 103d-Second moving iron bolt. Detailed Implementation

[0039] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0040] Furthermore, if terms such as "first" or "second" are used for descriptive purposes only, they are mainly used to distinguish different devices, components or parts (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance or quantity of the indicated devices, components or parts, and should not be construed as indicating or implying relative importance.

[0041] Furthermore, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0042] Please also refer to Figure 1-3 This invention provides an offline detection method for the magnitude of the electromagnetic force of an elevator brake, comprising the following steps:

[0043] S1. Remove the brake 100 from the ground, then separate the stationary iron block 102 and the moving iron block 103 on the brake 100, and remove the original bolts and brake shoes on the stationary iron block 102 and the moving iron block 103.

[0044] S2. Using the first stationary iron bolt 102b, the stationary iron block 102 and the moving iron block 103 are installed and positioned on the test platform of the pressure detector in a simulated online state, so that the moving iron block 103 can slide on the first stationary iron bolt 102b when the brake 100 is not energized.

[0045] S3. Using the second moving iron screw hole 103c and the second moving iron bolt 103d, a separation plate 1 is fastened and installed on the moving iron block 103. The installation method and position of the separation plate 1 simulate the installation of the brake shoe 105 when online.

[0046] S4. Install the push rod 3 on the pressure head 2 of the pressure detector in the second static iron screw hole 102c, so that the push rod 3 abuts against the separation plate 1;

[0047] S6. Power the brake 100 on the pressure detector test platform with the rated voltage, so that the moving iron block 103 is attracted to the stationary iron block 102;

[0048] S7. Activate the pressure detector, causing the pressure head 2 to drive the push rod 3 to slowly press down until the moving iron block 103 is freed from the electromagnetic force binding the stationary iron block 102 and separates from the stationary iron block 102. Read and record the final pressure display value on the pressure detector. This final pressure display value is the electromagnetic force that separates the elevator brake 100, and it is also the braking force of the elevator brake.

[0049] Furthermore, the offline detection method for the magnitude of the electromagnetic force of the elevator brake in this case also includes a step S5 between steps S4 and S6: several shims 4 are symmetrically placed in the air gap 104 between the stationary iron block 102 and the moving iron block 103, so that a certain gap is generated between the stationary iron block 102 and the moving iron block 103.

[0050] Preferably, in this embodiment, the thickness of the gasket 4 in step S5 is equal to the width of the maximum air gap 104 when the brake 100 is online, thereby simulating the maximum design value of the air gap 104.

[0051] Preferably, in this embodiment, the gasket 4 in step S5 is made of a non-magnetic material, thereby ensuring the accuracy of the detected electromagnetic force of the brake 100, which is closer to the separation electromagnetic force when the brake 100 is online.

[0052] Preferably, in this embodiment, the gasket 4 in step S5 can be two long strip gaskets or four short strip gaskets, as long as the gasket 4 can be symmetrically placed in the air gap 104 between the stationary iron block 102 and the moving iron block 103.

[0053] Furthermore, step S2 also includes the following sub-steps:

[0054] S21. First, pass the first stationary iron bolt 102b through the first stationary iron bolt hole 102a;

[0055] S22. Then pass the first stationary iron bolt 102b through the first moving iron bolt hole 103a;

[0056] S23. Finally, position the assembled stationary iron block (102) and moving iron block (103) on the test platform of the pressure detector, and make the first stationary iron bolt (102b) abut against the test platform of the pressure detector.

[0057] Furthermore, in step S3, the four corners of the separation plate 1 are provided with screw holes corresponding to the screw holes 103c of the second moving iron. The second moving iron bolt 103d passes through the screw holes at the four corners of the separation plate 1 and is screwed into the screw holes 103c of the second moving iron, so that the separation plate 1 can be fastened on the moving iron block 102.

[0058] Preferably, in this embodiment, the outer diameter of the push rod 3 on the pressure head 2 of the pressure detector is smaller than the inner diameter of the second stationary iron screw hole 102c, so that the push rod 3 can move freely within the second stationary iron screw hole 102c.

[0059] Preferably, in this embodiment, the outer diameter of the first stationary iron bolt 102b is smaller than the inner diameter of the first moving iron screw hole 103a.

[0060] Preferably, in this embodiment, the load-bearing capacity of the separation plate 1 is 1.5 to 2 times or more the theoretically calculated value of the separation electromagnetic force when the brake 100 leaves the factory, so as to avoid the top rod 3 damaging the separation plate 1 and causing the test to fail.

[0061] It should be understood that the pressure detector in this embodiment includes a pressure-bearing testing platform and a pressure head 2. A top rod 3 is installed on the pressure head 2. The testing platform can support the pressure during the testing process of the brake 100, and the pressure head 2 can concentrate the pressure on the separation plate 1. The pressure detector can record the maximum pressure value when the moving iron block 103 separates from the stationary iron block 102 during the testing process. Preferably, in this embodiment, the pressure detector is a standard part of a universal testing machine of model UTM5305X, with a measurement range of 0 to 300 kN.

[0062] Compared to existing technologies, the advantages of this method are as follows: It utilizes the existing first stationary iron screw hole and first stationary iron bolt of the brake to offline install and fix the brake on the pressure detector's testing platform, thus simulating the brake's online state; it utilizes the existing second stationary iron screw hole of the brake to install the pressure detector's push rod, facilitating testing; and it utilizes the existing second moving iron screw hole and second moving iron bolt of the brake to install the separation plate, allowing the push rod and separation plate to separate the moving iron block from the stationary iron block. Under the action of the pressure detector, the electromagnetic force value at the separation of the moving iron block and the stationary iron block of the brake can be read and recorded. Because it fully utilizes the existing components of the brake, this method is simple and easy to control, closely approximates the brake's online working state, provides accurate test results, and is low in cost.

[0063] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. An offline detection method for the magnitude of the electromagnetic force of an elevator brake, characterized in that: Includes the following steps: S1. Remove the brake (100) and disconnect it from the ground. Then separate the stationary iron block (102) and the moving iron block (103) on the brake (100) and remove the original bolts and brake shoes (105) on the stationary iron block (102) and the moving iron block (103). S2. Using the first stationary iron bolt (102b), the stationary iron block (102) and the moving iron block (103) are installed and positioned on the test platform of the pressure detector in a simulated online state, so that the moving iron block (103) can slide on the first stationary iron bolt (102b) when the brake (100) is not energized; S3. Using the second moving iron screw hole (103c) and the second moving iron bolt (103d) to fasten and install a separation plate (1) on the moving iron block (103). The installation method and installation position of the separation plate (1) simulate the installation of the brake shoe (105) when online. S4. Install the push rod (3) on the pressure head (2) of the pressure detector in the second static iron screw hole (102c) so that the push rod (3) abuts against the separation plate (1); S5. Place several shims (4) symmetrically in the air gap (104) between the stationary iron block (102) and the moving iron block (103) to create a certain gap between the stationary iron block (102) and the moving iron block (103); S6. Power the brake (100) on the pressure detector test platform with the rated voltage so that the moving iron block (103) is attracted to the stationary iron block (102); S7. Start the pressure detector so that the pressure head (2) drives the push rod (3) to slowly press down until the moving iron block (103) is freed from the electromagnetic force binding of the stationary iron block (102) and separates from the stationary iron block (102). Read and record the final pressure display value on the pressure detector.

2. The offline detection method for the magnitude of the electromagnetic force of an elevator brake according to claim 1, characterized in that: The step S2 also includes the following sub-steps: S21. First, pass the first stationary iron bolt (102b) through the first stationary iron bolt hole (102a); S22. Then pass the first stationary iron bolt (102b) through the first moving iron bolt hole (103a); S23. Finally, position the assembled stationary iron block (102) and moving iron block (103) on the test platform of the pressure detector, and make the first stationary iron bolt (102b) abut against the test platform of the pressure detector.

3. The offline detection method for the magnitude of the electromagnetic force of an elevator brake according to claim 1, characterized in that: The thickness of the gasket (4) in step S5 is equal to the width of the maximum air gap (104) when the brake (100) is online.

4. The offline detection method for the magnitude of the electromagnetic force of an elevator brake according to claim 1, characterized in that: In step S3, the four corners of the separation plate (1) are provided with screw holes corresponding to the screw holes (103c) of the second moving iron. The second moving iron bolt (103d) passes through the screw holes at the four corners of the separation plate (1) and is screwed into the screw holes (103c) of the second moving iron.

5. The offline detection method for the magnitude of the electromagnetic force of an elevator brake according to claim 1, characterized in that: The outer diameter of the push rod (3) on the pressure head (2) of the pressure detector is smaller than the inner diameter of the second static iron screw hole (102c).

6. The offline detection method for the magnitude of the electromagnetic force of an elevator brake according to claim 1, characterized in that: The outer diameter of the first stationary iron bolt (102b) is smaller than the inner diameter of the first moving iron bolt hole (103a).

7. The offline detection method for the magnitude of the electromagnetic force of an elevator brake according to claim 1, characterized in that: The gasket (4) in step S5 is made of non-magnetic material; and the gasket (4) is either two long strip gaskets or four short strip gaskets.

8. The offline detection method for the magnitude of the electromagnetic force of an elevator brake according to claim 1, characterized in that: The load-bearing capacity of the separation plate (1) is more than 1.5 to 2 times the theoretical calculation value of the separation electromagnetic force when the brake (100) leaves the factory.

9. The offline detection method for the magnitude of the electromagnetic force of an elevator brake according to claim 1, characterized in that: The pressure detector includes a pressure-bearing test platform and a pressure head (2), with a top rod (3) installed on the pressure head (2); the pressure detector is a standard part of a universal testing machine with model UTM5305X, and its measurement range is 0 to 300kN.

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