A precise and fast shaft threading tool

Abstract

A precise and fast shaft threading tool comprises a drum body, a drum shaft, and a guide device heating belt. The tool and construction method are designed for the drum shaft and the drum body to fit together during shaft threading. In the design drawings, the fit between the drum shaft and the drum body is an interference fit. Under the general method, the drum shaft cannot be inserted into the drum body. Therefore, the spline side of the drum body is heated and expanded before installation; and during the shaft threading process, it is difficult for the drum shaft to be correctly assembled to the opposite side hub, and there is a deviation. For this reason, a guide device is installed on the drum body to provide guidance for the drum shaft during the installation and alignment process, so that they can be assembled together faster and more accurately.

Description

Technical Field

[0001] The utility model belongs to the field of metal joint manufacturing and installation, and particularly relates to a precise and fast shaft threading tool. Background Art

[0002] The main hoist equipment of Baise ship lift adopts wire rope winch type, which consists of 8 sets of winch lifting mechanisms (16 sets of lifting drum groups), 1 set of mechanical synchronous shaft system, 8 sets of balancing drum groups, 2 sets of safety braking systems, 2 sets of emergency braking systems, 8 sets of dry oil lubrication systems, 1 set of maintenance platform and second phase embedded parts and other equipment.

[0003] Each winch lifting mechanism is driven by an AC variable frequency motor. The power of the motor is transmitted to the high-speed shaft (input shaft) of the reducer through the coupling, and then transmitted to the two lifting drum groups connected to the two sides of its low-speed shaft through the gear mechanism of the reducer. One end of the drum shaft is supported on the housing of the reducer, and the other end is supported on the rolling bearing seat. All 8 reducers are connected to form a rectangular closed mechanical shaft synchronization system through the second high-speed shaft, coupling, mechanical shaft, bearing seat, etc. In addition, the main hoist is equipped with a set of balancing drum groups upstream and downstream of the two winch lifting mechanisms in each lifting point area. All drum groups are composed of drum bodies, drum shafts, spline sleeves, rolling bearing seats, brake discs, etc.

[0004] The weight of the hoisting drum blank is about 125t, and the net weight is 98.2t. The assembly of the drum of the Baise ship lift is mainly carried out in the general assembly workshop. The weight of the hoisting drum after assembly (drum, shaft, spline sleeve) is 150t. The drum hoisting uses the 260t bridge crane in the general assembly workshop as the lifting equipment, and the weight of the wire rope and other lifting equipment is about 1t. The weight of the balance drum after assembly (drum + shaft) is 250t.

[0005] To meet the installation requirements, the drum shaft needs to be inserted into the drum body to be interference fit. Summary of the invention

[0006] The technical problem to be solved by the utility model is to provide a precise and fast shaft threading tool. The utility model has a simple structure and is easy to operate and use. The participation of special equipment is reduced during use and the safety is increased.

[0007] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0008] A precise and fast shaft threading tool comprises a reel body, a guide device and a heating belt. The guide device is installed on the reel body and is used to provide guidance for the reel shaft during installation and alignment. The heating belt is installed at the end of the reel body.

[0009] Preferably, the guide device is welded on the reel body for guiding when threading the shaft.

[0010] Preferably, four guide devices are provided on the reel body, and the four guide devices are evenly and symmetrically arranged; the guide devices are wedge-shaped blocks.

[0011] Preferably, the heating belt is an electromagnetic heater for heating the wheel hub.

[0012] Preferably, the heating belt is a spiral disc structure.

[0013] The utility model can achieve the following beneficial effects:

[0014] The utility model has the advantages of simple composition and structure, convenient operation and use, reduced manual participation in the operation process, and can quickly and accurately complete the interference fit between the shaft and the hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0016] Figure 1 It is a three-dimensional structural diagram of the utility model;

[0017] Figure 2 This is a structural diagram of the guide device and the reel shaft of the utility model;

[0018] Figure 3 This is the internal structure diagram of the utility model;

[0019] Figure 4 It is a cross-sectional view of the utility model.

[0020] In the figure: a reel shaft 1, a guide device 2, a heating belt 3, and a reel body 4. DETAILED DESCRIPTION

[0021] The preferred solution is Figures 1 to 4 As shown, a precise and fast shaft threading tool includes a drum body 4, a drum shaft 1, a guide device 2, and a heating belt 3. The drum shaft 1 and the drum body 4 are designed to cooperate when threading the shaft. On the design drawings, the cooperation between the drum shaft 1 and the drum body 4 is an interference fit. Under the general method, the drum shaft 1 cannot be inserted into the drum body 4. Therefore, the spline side of the drum body 4 is heated and expanded before installation; and during the threading process, it is difficult for the drum shaft 1 to be correctly assembled to the opposite side hub, and there is a deviation. For this reason, a guide device 2 is installed on the drum body 4 to provide guidance for the drum shaft 1 during the installation and alignment process, so that they can be assembled together faster and more accurately.

[0022] Further, the reel body 4, the reel shaft 1, the guide device 2 and the heating belt 3, the tooling and construction method are designed for the reel shaft 1 and the reel body 4 when they are matched and threaded;

[0023] Furthermore, the guide device 2 is welded on the reel body 4 and is used for guiding when threading the shaft.

[0024] Furthermore, there are four guide devices 2 on the reel body, which are evenly and symmetrically arranged.

[0025] Furthermore, in the design drawings, the fit between the reel shaft 1 and the reel body 4 is an interference fit, and they cannot be freely assembled under normal circumstances, and the hole needs to be heated.

[0026] Furthermore, the wheel hub is heated by an electromagnetic heater and measured by an infrared thermometer. When the temperature reaches the temperature required by the process design, the heater is removed and the inner hole size of the wheel hub is measured. When the wheel hub reaches the thermal expansion amount required by the process design, the reel shaft is immediately hoisted into place. When assembling the reel shaft, a guide device must be set on the inside of the reel hub to assist in the smooth assembly of the reel shaft.

[0027] Furthermore, the drum spline side and the shaft are interference fit, the drum brake disc end is transition fit, and the drum spline side is installed by heating. First, the electromagnetic heater is used to heat the spline side hub, and heat insulation cotton needs to be laid on the spokes. During heating, an infrared thermometer is used to measure the end surface temperature of the drum hub. When the end surface temperature of the hub reaches 400 degrees Celsius, the heater is turned off, the heater is hoisted, and heat insulation cotton is laid on the hub. Then the inner hole size of the hub is measured. After checking that the deformation amount is reached, the drum shaft is hoisted into place.

[0028] Furthermore, through thermo-solid coupling analysis, the inner hole and end face of the drum hub were heated to 400°C and air-cooled. The ambient temperature during air cooling was 0°C. After 2 hours of air cooling (the estimated installation time of the drum shaft was 1.5 hours), the maximum temperature of the end face of the drum hub was 126.8°C.

[0029] Furthermore, the minimum radial deformation at this moment is 0.3329mm, and the maximum deformation is 0.74503mm, which increases from the outer side of the flange to the inner side. When the shaft is installed, the hub hole at the brake disc end is used as the reference for installation. The current boring method at both ends can meet the installation requirements of the shaft.

[0030] Embodiment 1:

[0031] In the production of metal structures, the interference fit between large shafts and holes has always been a difficult problem. For small fits, liquid nitrogen freezing can be used to solve the problem of fit clearance size, but especially when the weight exceeds the controllable range, it is economically unreasonable and only other methods can be used. Therefore, a method of auxiliary tooling and electromagnetic heating is invented to meet the assembly requirements. The specific plan is as follows:

[0032] A precise and fast shaft threading tool includes a drum body 4, a drum shaft 1, a guide device 2, and a heating belt 3. The drum shaft 1 and the drum body 4 are designed to cooperate when threading the shaft. On the design drawings, the cooperation between the drum shaft 1 and the drum body 4 is an interference fit. Under the general method, the drum shaft 1 cannot be inserted into the drum body 4. Therefore, the spline side of the drum body 4 is heated and expanded before installation; and during the threading process, it is difficult for the drum shaft 1 to be correctly assembled to the opposite side hub, and there is a deviation. For this reason, a guide device 2 is installed on the drum body 4 to provide guidance for the drum shaft 1 during the installation and alignment process, so that it can be assembled faster and more accurately. First, the heating belt 3 is laid around the orifice of the drum body 4, and heating begins. The orifice will expand under the action of temperature, and then the drum shaft 1 is hoisted and inserted into the hole of the drum body 4, and it is fitted into place under the action of the guide device 2.

[0033] The working principle of this device:

[0034] First, the wheel hub is heated with an electromagnetic heater and measured with an infrared thermometer. When the temperature reaches the temperature required by the process design, the heater is removed and the inner hole size of the wheel hub is measured. When the wheel hub reaches the thermal expansion required by the process design, the drum shaft is immediately hoisted into place. When assembling the drum shaft, a guide device must be set on the inside of the drum hub to assist in the smooth assembly of the drum shaft.

[0035] The spline side of the drum is interference fit with the shaft, the brake disc end of the drum is transition fit, and the spline side of the drum is installed by heating. First, the electromagnetic heater is used to heat the spline side hub, and insulation cotton needs to be laid on the spokes. During heating, an infrared thermometer is used to measure the end face temperature of the drum hub. When the end face temperature of the hub reaches 400 degrees Celsius, the heater is turned off, the heater is hoisted, and insulation cotton is laid on the hub. Then the inner hole size of the hub is measured. After checking that the deformation amount is reached, the drum shaft is hoisted into place. Through thermo-solid coupling analysis, the inner hole and end face of the drum hub are heated to 400℃ and air-cooled. The ambient temperature during air cooling is 0℃. After 2 hours of air cooling (the estimated installation time of the drum shaft is 1.5 hours), the maximum temperature of the drum hub end face is 126.8℃. The minimum radial deformation generated at this moment is 0.3329mm, and the maximum deformation is 0.74503mm, which increases from the outer side of the flange to the inner side. When the shaft is installed, the hub hole at the brake disc end is used as a reference for installation, and the current method of boring holes at both ends can meet the installation requirements of the shaft.

[0036] The lifting drum assembly is φ4560mm, 6650mm long, and weighs 98122kg. It is welded from Q355C and 35# structural steel. In order to fit the drum shaft during assembly, the inner diameter surface and end surface of the end flange need to be heated (heat source temperature 400℃) to achieve the purpose of tight fit after the drum shaft is installed. The temperature is applied using multiple load steps. The temperature field is applied to the inner circle surface and outer end surface of the end flange of the lifting drum, and the temperature is set to 400℃. The temperature is linearly increased between 0~800s, kept warm between 800~1800s, and cooled naturally between 1800~9000s, and cooled for 2 hours.

[0037] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limitations of the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A precise and fast shaft threading tool, characterized by: The invention comprises a reel body (4), a guide device (2) and a heating belt (3); the guide device (2) is installed on the reel body (4); the guide device (2) is used to provide guidance for the reel shaft (1) during the installation and alignment process; and the heating belt (3) is installed at the end of the reel body (4).

2. The precise and fast shaft threading tool according to claim 1, characterized in that: The guide device (2) is welded to the reel body (4) and is used for guiding when threading the shaft.

3. The precise and fast shaft threading tool according to claim 2, characterized in that: Four guide devices (2) are provided on the reel body (4), and the four guide devices (2) are evenly and symmetrically arranged; the guide devices (2) are wedge-shaped blocks.

4. The precise and fast shaft threading tool according to claim 1, characterized in that: The heating belt (3) is an electromagnetic heater and is used to heat the wheel hub.

5. The precise and fast shaft threading tool according to claim 4, characterized in that: The heating belt (3) is a spiral disc structure.

Images