Brake resistance box assembly of mining dump truck

Abstract

The utility model relates to the technical field of vehicle braking, and discloses a braking resistance box assembly of a mining dump truck. The fan is fixed in a framework of the box body through an insulating fastener, the resistor unit A and the resistor unit B are fixed in the framework of the box body through damping fasteners, located at the two ends of the fan and composed of a plurality of resistor grids, and operation openings are formed in the positions, located at the installation positions of the resistor unit A and the resistor unit B, of the two sides of the box body. A sealing plate is fixedly mounted on the operation opening; the insulating fastener comprises a first screw rod, a lower insulating part, an upper insulating part, a round nut and a first fastening nut, the top of the lower insulating part is provided with a boss inserted into a mounting hole in the resistance grid mounting beam, the bottom of the upper insulating part is provided with a counter bore connected with the boss in an inserted mode, the first screw rod penetrates through the lower insulating part and the upper insulating part and then is in threaded connection with the round nut, and the first fastening nut is in threaded connection with the round nut. And the resistance grid is fixed on the first screw rod through the first fastening nut. According to the utility model, the resistance grid is convenient to fasten, and the structure of the insulating fastener is also simplified.

Description

Technical Field

[0001] This utility model relates to the field of vehicle braking technology, and in particular to a braking resistor box assembly for a mining dump truck. Background Technology

[0002] Mining dump trucks are large-scale mining transportation equipment. The braking system is a crucial component of a mining dump truck, its performance directly affecting the overall safety of the vehicle. The quality of the braking system design directly impacts the degree to which braking technology requirements are met. In many mines, mining dump trucks operate 24 hours a day, placing extremely high demands on the vehicle's safety, reliability, and minimizing driver workload. The braking system of a mining dump truck consists of two parts: electric braking and hydraulic braking. When the vehicle is going downhill and electric braking is applied, the wheel motors act as generators, converting the vehicle's kinetic energy into electrical energy. This electrical energy is then fed into the resistor assembly and converted into heat energy, which is dissipated into the atmosphere, thus reducing the vehicle's speed and achieving braking.

[0003] Existing braking resistor assemblies include, for example, Chinese patent application CN201220254955.6, filed on June 1, 2012, which discloses a braking resistor device for an electric wheel dump truck. This braking resistor device has the following drawbacks:

[0004] 1. Due to the small installation gap between the resistor grids, they cannot be tightened one by one (which may cause the subsequent resistor grids to be unable to align with the mounting holes and thus fail to be installed). All resistor grids need to be placed in place before being tightened uniformly. However, this type of braking resistor device can only be tightened by reaching under the bracket from the end face, which makes the installation difficult and the installation efficiency very low.

[0005] 2. In the existing braking resistor device, the resistor grid and the mounting beam are insulated by lower and upper insulating porcelain. Mica tubes are also installed between the lower and upper insulating porcelain and the screw to insulate the screw and the mounting beam. This insulation method has a complex structure, and the insulating porcelain is a brittle material that is easily damaged by impact and loses its insulation properties.

[0006] 3. In the existing type of braking resistor device, the vibration is damped by rubber pads between the fan and the mounting beam. Most of the rubber pads are exposed to the air, which makes them susceptible to environmental corrosion, aging and cracking, thus affecting the vibration damping effect.

[0007] 4. In this type of braking resistor device, the resistor unit uses a busbar to pass through the outside of the enclosure for wiring, and waterproof measures need to be taken at the point where the busbar passes through the enclosure.

[0008] 5. For existing braking resistor devices, refer to the attached diagram for wiring between resistor grids. Figure 8As shown, the parallel resistor unit A and resistor unit B are controlled by brake contactor 8 respectively. The two brake contactors operate simultaneously. The fan is only electrically connected to resistor unit A or resistor unit B. When the contactor electrically connected to the fan is damaged, the other resistor unit will be damaged because it will not have the cooling effect of the fan when it is working.

[0009] Based on this, this application provides a braking resistor box assembly for a mining dump truck to solve the above-mentioned problems. Summary of the Invention

[0010] The present invention aims to solve the technical problems existing in the prior art. Therefore, the present invention provides a braking resistor box assembly for a mining dump truck.

[0011] The technical solution adopted by this utility model to solve its technical problem is:

[0012] A braking resistor box assembly for a mining dump truck is provided, comprising a housing, a fan located in the middle of a frame fixed to the housing by insulating fasteners, and resistor units A and B, each composed of multiple resistor grids, located at both ends of the fan within the frame of the housing by shock-absorbing fasteners. Air inlets are located on both sides of the middle of the housing, and air outlets are located at both ends of the housing. Both sides of the housing have operating ports for convenient installation of resistor grids at the installation positions of resistor units A and B, and sealing plates are fixedly installed on the operating ports. The insulating fasteners include a first screw, a lower insulating component, an upper insulating component, a round nut, and a first fastening nut. The top of the lower insulating component has a boss that inserts into a mounting hole on the resistor grid mounting beam, and the outer diameter of the boss is smaller than the diameter of the mounting hole. The bottom of the upper insulating component has a countersunk hole that engages with the boss. The first screw passes through the lower and upper insulating components and is screwed to the round nut. The resistor grids are fixed to the first screw by the first fastening nut.

[0013] In some alternative embodiments, the lower and upper insulators are made of bakelite.

[0014] In some alternative embodiments, the lower insulating member and / or the upper insulating member have a regular hexagonal cross-section, and the head of the first screw is a hexagonal head, which is embedded and fixedly installed at the bottom of the lower insulating member.

[0015] In some alternative embodiments, the round nut has wrench slots on both sides for easy tightening with a wrench.

[0016] In some optional embodiments, the vibration damping fastener includes a second screw, a vibration damping element, and a second fastening nut. The vibration damping element consists of an inner flange sleeve, a bushing, and an outer flange sleeve. The bushing is made of silicone and is located between the inner flange sleeve and the outer flange sleeve. The second screw passes through the fan mounting beam, the fan mounting plate, the vibration damping element, and is screwed to the second fastening nut.

[0017] In some alternative implementations, the access port extends to the bottom of the housing.

[0018] In some alternative implementations, the operating port is provided with a gland, through which the wiring cable passes into the housing to connect with resistor unit A and resistor unit B.

[0019] In some optional embodiments, the fan is electrically connected to resistor unit A or resistor unit B, and a connecting cable is provided between resistor unit A and resistor unit B to realize the electrical connection between the fan and resistor unit B or resistor unit A.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] 1. This utility model provides an operating port on both sides of the housing at the installation position of the resistor unit, which allows for tightening of the fastening bolts of each resistor grid from the front, greatly improving installation efficiency and reducing installation difficulty.

[0022] 2. The designed insulating fastener does not require the installation of mica tubes on the screw, which simplifies the structure. Furthermore, the upper and lower insulating parts of bakelite have good insulation effect, long service life, and will not be damaged by collision.

[0023] 3. The first screw is embedded and fixed in the lower insulating part. It can be tightened by directly turning the lower insulating part. The lower insulating part has a large area, which makes the tightening operation more convenient.

[0024] 4. The designed shock absorber uses inner and outer flanges to cover silicone bushings, which can effectively reduce the exposed surface of the bushing, thereby reducing bushing corrosion and improving bushing service life.

[0025] 5. By using a method of wiring the cable through the gland and inside the enclosure, the problem of needing waterproofing measures for traditional busbar wiring through the enclosure is solved;

[0026] 6. By setting a connecting cable between resistor unit A and resistor unit B, the fan is electrically connected to resistor unit A and resistor unit B. This effectively solves the problem that traditional resistor devices are damaged when the contactor connected to the fan is damaged, resulting in the other resistor unit being damaged without the cooling effect of the fan during operation. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0028] Figure 1 This is an assembly drawing of the braking resistor box assembly for mining dump trucks provided by this utility model;

[0029] Figure 2 This is an internal structural diagram of the braking resistor box assembly for mining dump trucks provided by this utility model;

[0030] Figure 3 This is a structural diagram of the frame of the box provided by this utility model;

[0031] Figure 4 This is a diagram showing the installation structure of the resistor grid on the resistor grid mounting beam provided by this utility model;

[0032] Figure 5 yes Figure 4 Exploded view of the provided insulating fastener;

[0033] Figure 6 This is a structural diagram of the installation of the fan on the fan mounting beam provided by this utility model;

[0034] Figure 7 yes Figure 2 The provided top view;

[0035] Figure 8 This is a wiring reference diagram of the resistor grid of an existing braking resistor device and the fan;

[0036] Figure 9 This is a wiring diagram of the resistor grid and the fan of the braking resistor box assembly provided by this utility model.

[0037] The attached diagram lists the components represented by each number as follows:

[0038] 1—Box body, 1.1—Frame, 1.1.1—Resistor grid mounting beam, 1.1.2—Fan mounting beam, 1.2—Air inlet, 1.3—Air outlet, 1.4—Operating port, 2—Fan, 3—Resistor grid, 4—Insulating fastener, 4.1—First screw, 4.2—Lower insulating component, 4.2.1—Boss, 4.3—Upper insulating component, 4.4—Round nut, 4.5—First fastening nut, 5—Shock-absorbing fastener, 5.1—Second screw, 5.2—Shock-absorbing component, 5.2.1—Inner flange sleeve, 5.2.2—Bushing, 5.2.3—Outer flange sleeve, 5.3—Second fastening nut, 6—Sealing plate, 7—Connecting cable, 8—Brake contactor. Detailed Implementation

[0039] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0040] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0041] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0042] Furthermore, the terms "first," "second," etc., used in this utility model are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. The terms "installed," "connected," and "joined" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0043] Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model. Example 1

[0044] As attached Figure 1 and attached Figure 2 As shown, this embodiment provides a braking resistor box assembly for a mining dump truck, including a box body 1, a fan 2 located in the middle of a frame 1.1 fixed to the box body by insulating fasteners 4, and resistor units A and B, which are composed of multiple resistor grids 3 and located at both ends of the fan 2, respectively fixed to the frame 1.1 of the box body by shock-absorbing fasteners 5. Air inlets 1.2 are located on both sides of the middle of the box body 1, and air outlets 1.3 are located at both ends of the box body 1.

[0045] To address the issue of inconvenience in tightening existing braking resistor boxes after the resistor grids are installed, as shown in the attached document... Figure 2 As shown, in this embodiment, operation ports 1.4 are provided on both sides of the housing 1 at the installation positions of resistor unit A and resistor unit B to facilitate the installation of resistor grid 3. Preferably, the operation ports 1.4 are extended to the bottom of the housing 1. A sealing plate 6 is fixedly installed on the operation port 1.4. After the resistor is tightened, the sealing plate is fixed on the operation port.

[0046] To address the issues of complex structure and susceptibility to impact damage associated with existing resistor grids using insulating ceramics, as shown in the attached document... Figure 2 To be continued Figure 5 As shown, this embodiment designs an insulating fastener 4, which includes a first screw 4.1, a lower insulating member 4.2, an upper insulating member 4.3, a round nut 4.4, and a first fastening nut 4.5. The top of the lower insulating member 4.2 is provided with a boss 4.2.1 for inserting into the mounting hole on the resistor grid mounting beam 1.1.1, and the outer diameter of the boss 4.2.1 is smaller than the diameter of the mounting hole. The bottom of the upper insulating member 4.3 is provided with a countersunk hole for inserting into the boss 4.2.1. The first screw 4.1 passes through the lower insulating member 4.2 and the upper insulating member 4.3 and is screwed to the round nut 4.4. The resistor grid 3 is fixed to the first screw 4.1 by the first fastening nut 4.5. Preferably, the lower insulating member 4.2 and the upper insulating member 4.3 are made of bakelite. Preferably, the round nut 4.4 in this embodiment has wrench grooves on both sides for easy tightening with a wrench. The insulating fastener designed in this embodiment does not require the installation of a mica tube on the screw, which simplifies the structure. Furthermore, the upper and lower insulating parts made of bakelite have good insulation effect, long service life, and will not be damaged by collision.

[0047] During the installation of the resistor grid, first, pass the boss of the lower insulating component through the mounting hole of the resistor grid mounting beam. Then, put the upper insulating component onto the boss of the upper and lower insulating components. Next, pass the first screw through the lower and upper insulating components in sequence. Then, screw the round nut onto the first screw (do not tighten it). Install all the insulating fasteners at both ends of each resistor grid on the resistor grid mounting beam in the above manner. Then, install all the resistors in place and tighten the fastening nut of each insulating fastener from the operating port. Finally, tighten the first screw one by one. Example 2

[0048] Based on Example 1, this example further optimizes the insulating fastener, as shown in the attached figure. Figure 5 As shown, in this embodiment, the lower insulating member 4.2 and / or the upper insulating member 4.3 have a hexagonal cross-section. The head of the first screw 4.1 is a hexagonal head, which is embedded and fixedly installed at the bottom of the lower insulating member. That is, the bottom of the lower insulating member has a hexagonal hole, and the hexagonal head of the first screw is recessed into the hexagonal hole. Then, insulating glue can be used to seal and fix it to prevent the first screw from coming out. This implementation allows for direct tightening of the lower insulating member. The lower insulating member has a large area, making the tightening operation more convenient. At the same time, the first screw and the lower insulating member are assembled into a single structure, eliminating the need to insert the first screw, thus simplifying the installation of the resistor grid. Example 3

[0049] Based on Embodiment 1 or Embodiment 2, this embodiment designs a shock-absorbing fastener 5, as shown in the attached figure. Figure 6 As shown, the vibration damping fastener 5 in this embodiment includes a second screw 5.1, a vibration damping component 5.2, and a second fastening nut 5.3. The vibration damping component 5.2 consists of an inner flange sleeve 5.2.1, a bushing 5.2.2, and an outer flange sleeve 5.2.3. The bushing 5.2.2 is made of silicone and is located between the inner flange sleeve 5.2.1 and the outer flange sleeve 5.2.3. The second screw 5.1 passes through the fan mounting beam 1.1.2, the fan mounting plate, the vibration damping component 5.2, and is screwed to the second fastening nut 5.3. The vibration damping component designed in this embodiment, by using the inner and outer flange sleeves to cover the silicone bushing, can effectively reduce the exposed surface of the bushing, thereby reducing the corrosion of the bushing and improving its service life. Example 4

[0050] Based on any of the above embodiments, as shown in the appendix Figure 1 and attached Figure 2 As shown, this embodiment has a gland (not shown in the figure) on the operation port 1.4. The wiring cable passes through the gland and enters the enclosure to connect with resistor unit A and resistor unit B. This embodiment uses the method of wiring through the gland to solve the problem of needing waterproofing measures when wiring the busbar through the enclosure in the traditional way. Example 5

[0051] Based on any of the above embodiments, this embodiment further provides that the fan is electrically connected to resistor unit A or resistor unit B, and a connecting cable 7 is provided between resistor unit A and resistor unit B to realize the electrical connection between the fan 2 and resistor unit B or resistor unit A. That is: in one embodiment, as shown in the attached... Figure 7 and attached Figure 9 As shown, the fan is electrically connected to resistor unit A, and a connecting cable is provided between resistor unit A and resistor unit B to achieve electrical connection between the fan and resistor unit B. In other embodiments, the fan can also be electrically connected to resistor unit B, and a connecting cable is provided between resistor unit A and resistor unit B to achieve electrical connection between the fan and resistor unit A. This design achieves electrical connection between the fan and resistor units A and B, effectively solving the problem in traditional resistor devices where damage to the contactor connected to the fan results in the other resistor unit being damaged due to lack of cooling air from the fan during operation.

[0052] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made using the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A mine dump truck brake resistor box assembly, comprising a box body, a fan fixed in the middle of the box body through an insulating fastener, resistor unit A and resistor unit B composed of a plurality of resistor grids respectively fixed at both ends of the fan in the box body through a damping fastener, an air inlet on both sides of the middle of the box body, and an air outlet at both ends of the box body; characterized in that: Both sides of the box body are provided with an operation port for facilitating the installation of the resistor grid at the installation position of the resistor unit A and the resistor unit B, and a sealing plate is fixedly installed on the operation port. The insulating fastener comprises a first screw rod, a lower insulating part, an upper insulating part, a round nut, and a first fastening nut, the top of the lower insulating part is provided with a boss inserted into the mounting hole of the resistor grid mounting beam, and the outer diameter of the boss is smaller than the hole diameter of the mounting hole, the bottom of the upper insulating part is provided with a counterbore inserted with the boss, the first screw rod is screwed with the round nut after passing through the lower insulating part and the upper insulating part, and the resistor grid is fixed on the first screw rod through the first fastening nut.

2. The mining dump truck brake resistor box assembly of claim 1, wherein: The lower insulating part and the upper insulating part are made of bakelite.

3. The mining dump truck brake resistor box assembly of claim 2, characterized by: The cross section of the lower insulating part and / or the upper insulating part is a regular hexagon, and the head of the first screw rod is a hexagonal head which is fixedly installed in the bottom of the lower insulating part.

4. The mining dump truck brake resistor box assembly of claim 1, wherein: The round nut is provided with a wrench groove on both sides for easy tightening by a wrench.

5. The mining dump truck brake resistor box assembly of claim 1, wherein: The damping fastener comprises a second screw rod, a damping part, and a second fastening nut, the damping part is composed of an inner flange sleeve, a bushing, and an outer flange sleeve, the bushing is made of silica gel and is arranged between the inner flange sleeve and the outer flange sleeve, and the second screw rod is screwed with the second fastening nut after passing through the fan mounting beam, the fan mounting plate, and the damping part.

6. The mining dump truck brake resistor box assembly of claim 1, wherein: The operation port extends to the bottom of the box body.

7. The mining dump truck brake resistor box assembly of claim 1, wherein: A gland is arranged on the operation port, and a wiring cable passes through the gland into the box body to be connected with the resistor unit A and the resistor unit B.

8. The mining dump truck brake resistor box assembly of claim 1, wherein: The fan is electrically connected with the resistor unit A or the resistor unit B, and a connecting cable is arranged between the resistor unit A and the resistor unit B for electrically connecting the fan with the resistor unit B or the resistor unit A.

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