Long-stroke thermally-stable lead screw

Abstract

The utility model discloses a long stroke thermostable lead screw, which is mainly applied to the technical field of lead screws and comprises a lead screw, a speed reducer, a coupler, a first lead screw seat, a second lead screw seat and a lead screw nut seat, two ends of the lead screw are fixed on the first lead screw seat and the second lead screw seat, and one end of the lead screw close to the second lead screw seat is connected with the coupler. The coupler is connected with the speed reducer, the lead screw is provided with a lead screw nut seat, the first lead screw seat is composed of a lead screw support, a bearing seat inner gland, a bearing seat outer gland, bearing spacer bushes, bearings, lock washers, flat washers and belleville springs, a plurality of bearings are arranged in the lead screw support, the lead screw penetrates through inner rings of the bearings, the bearing spacer bushes are arranged at the two ends of the bearings, and the bearing spacer bushes are arranged on the bearing spacer bushes. And a locking nut is arranged on the outer side of the bearing spacer bush. The long-stroke thermal stability lead screw is scientific and reasonable in structural design, stable and reliable in operation, high in movement precision, good in thermal stability and low in manufacturing and improving cost, and has high application and popularization value.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of screw rod, concretely relates to a long-stroke thermal stability screw rod. BACKGROUND

[0002] In medium and large metal cutting machine tools, the application of screw rod is crucial, mainly reflected in the following aspects: first, provide accurate linear motion control, screw rod can provide accurate linear motion control, which is the basis for metal cutting machine tools to realize high-precision machining. When the machine tool works, it needs to accurately position and move the workpiece, and the high-precision characteristics of the screw rod ensure the dimensional accuracy and positional accuracy of the machining. Whether it is fine small size cutting or machining of large workpieces, the screw rod can ensure the accuracy of cutting, reduce errors, and make the finished products meet strict quality standards. Second, ensure the stability of movement, screw rod transmission has stable movement characteristics, which is particularly important for metal cutting machine tools. Smooth movement can avoid shaking and vibration during cutting, thereby ensuring the flatness and smoothness of the machined surface. In addition, smooth movement also helps to prolong the service life of the machine tool and reduce equipment wear and failure. Third, bear high load, medium and large metal cutting machine tools will generate large cutting force and inertial force during machining, and screw rod usually has high load capacity, which can stably support and transmit these forces to ensure the normal operation of the machine tool. The load capacity of the screw rod also determines the thickness and size range of the workpiece that the machine tool can handle, thereby improving the versatility and flexibility of the machine tool. Fourth, realize speed adjustment, screw rod can realize different cutting speed adjustment through cooperation with motor and other driving devices. This allows the machine tool to select the appropriate cutting speed according to different materials and cutting requirements, improving production efficiency. At the same time, accurate speed adjustment also helps to ensure cutting quality and avoid cutting defects caused by excessive speed or slow speed. Fifth, improve reliability and durability, high-quality screw rods are usually made of high-strength materials and undergo precise machining and heat treatment, with high reliability and durability. During the long-term use of the machine tool, the screw rod can maintain stable performance and is not prone to failure and damage. This reduces equipment maintenance costs and downtime, improving production efficiency.

[0003] The mechanical efficiency of the lead screw is not 100% when driving the load to reciprocate, part of kinetic energy is converted into heat, generally, the heat generated by the movement of the lead screw cannot be taken away by the lubricating oil in time or cannot be spread to the air in time, resulting in that the temperature of the lead screw itself is increased, which is higher than that of other parts in the movement mechanism. In the lead screw transmission structure, the two ends of the lead screw are fixed in the bearing seats on the two sides, the length of the lead screw is increased under the action of heat, and the mechanical parts connected with the lead screw are deformed under the action of strong molecular force, so that the displacement and deformation of the parts of the mechanical equipment are caused, the positioning accuracy and geometric accuracy of the equipment are deteriorated, and even the service life of the metal cutting equipment is reduced. The adverse consequences caused by the thermal elongation of the lead screw are more obvious for the medium and large metal cutting machine tools with large stroke and large load. Content of the utility model

[0004] The utility model provides a long -stroke thermal stability screw rod solves long -stroke screw rod under the condition of large load, length is long, thermal elongation and the problem of poor stability.

[0005] The technical scheme of the utility model is as follows: a long -stroke thermal stability screw rod, including screw rod, speed reducer, shaft coupling, first screw rod seat, second screw rod seat, screw rod nut seat, the both ends of the screw rod are fixed in the first screw rod seat, second screw rod seat, the one end close to the second screw rod seat of the screw rod is connected with the shaft coupling, the shaft coupling is connected with the speed reducer, there is the screw rod nut seat on the screw rod, the first screw rod seat is composed of screw rod support, bearing seat inner gland, bearing seat outer gland, bearing spacer, bearing, lock washer, flat washer, butterfly spring, there are a plurality of bearings in the screw rod support, the screw rod passes through the inner ring of bearing, there are bearing spacers at the both ends of the bearing, there are lock nuts on the outer side of the bearing spacer, the both ends of the screw rod support are detachably connected with the bearing seat inner gland and the bearing seat outer gland, the fixing bolt between the screw rod support and the bearing seat outer gland is sleeved with the lock washer, the flat washer and the butterfly spring, there is a cooling liquid channel on the screw rod nut seat, the both ends of the cooling liquid channel are cooling liquid inlet and cooling liquid outlet, the screw rod nut is sleeved in the screw rod nut seat.

[0006] Preferably, the screw rod, the screw rod support, the bearing seat inner gland and the bearing seat outer gland are made of stainless steel, titanium alloy or alloy steel.

[0007] Preferably, the diameter of the screw rod is not less than 60 mm.

[0008] Preferably, the first screw rod seat and the second screw rod seat are provided with frame seals at the both ends.

[0009] Preferably, the diameter of the cooling liquid channel is not less than 5 mm.

[0010] The principle of this utility model: This utility model solves the problem of thermal stability of long-stroke lead screws from the following two aspects. First, the existing method of installing lead screws in transmission mechanisms involves fixing both ends to lead screw seats, with the lead screw rotating under the support of the lead screw seats at both ends. The inner ring of the bearing is fixed to both ends of the lead screw by locking nuts on the outside of the bearing spacers, and the outer ring of the bearing is fixed in the bearing mounting holes of the lead screw seats. The outer ring of the bearing is pressed by the inner and outer pressure covers of the bearing seats. The inner and outer pressure covers of the bearing seats are rigidly connected to the lead screw support. This application addresses the issue of thermal stability of long-stroke lead screws by... An elastic device is installed between the outer pressure cover and the connecting bolts of the lead screw support. The elastic device consists of an anti-loosening washer, a flat washer, and a disc spring. In the actual operation of the lead screw, it can ensure sufficient compression and also ensure that the lead screw moves a certain distance to the far end when it thermally elongates, ensuring that the movement accuracy and stability of the lead screw remain unchanged. Secondly, a lead screw nut seat is fitted onto the existing lead screw nut, and the gap between the two is filled with thermally conductive silicone grease. A coolant channel is added to the lead screw nut seat to cool the lead screw nut, further preventing heat from diffusing to the lead screw and improving the thermal stability of the lead screw.

[0011] The beneficial effects of this utility model are: a long-stroke thermally stable lead screw with a scientific and reasonable structural design, stable and reliable operation, high motion accuracy, good thermal stability, low manufacturing and improvement costs, and high value for promotion and application. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 This is the front view of the present utility model;

[0014] Figure 3 This is a top view of the present invention;

[0015] Figure 4 for Figure 3 Sectional view along the BB direction;

[0016] Figure 5 for Figure 4 Enlarged view of part C in the middle;

[0017] Figure 6 A schematic diagram of the lead screw nut seat and the lead screw nut structure;

[0018] In the diagram, 101-lead screw, 102-first lead screw seat, 1021-lead screw bracket, 1022-inner pressure cover of bearing housing, 1023-outer pressure cover of bearing housing, 1024-bearing spacer, 1025-bearing, 1026-anti-loosening washer, 1027-flat washer, 1028-butterfly spring, 103-second lead screw seat, 104-reducer, 105-lead screw nut seat, 1051-coolant inlet, 1052-coolant outlet, 106-coupling. DETAILED DESCRIPTION

[0019] The specific embodiment of the utility model is: Figures 1-6 A long-stroke thermal stability screw rod, as shown in the figure, comprises a screw rod 101, a speed reducer 104, a shaft coupling 106, a first screw rod seat 102, a second screw rod seat 103, and a screw rod nut seat 105. The two ends of the screw rod 101 are fixed to the first screw rod seat 102 and the second screw rod seat 103. The end of the screw rod 101 close to the second screw rod seat 103 is connected with the shaft coupling 106. The shaft coupling 106 is connected with the speed reducer 104. The screw rod 101 is provided with the screw rod nut seat 105. The first screw rod seat 102 is composed of a screw rod support 1021, a bearing seat inner pressure cover 1022, a bearing seat outer pressure cover 1023, a bearing spacer 1024, a bearing 1025, a lock washer 1026, a flat washer 1027, and a butterfly spring 1028. A plurality of bearings 1025 are arranged in the screw rod support 1021. The screw rod 101 passes through the inner ring of the bearing 1025. The two ends of the bearing 1025 are provided with the bearing spacer 1024. The outer side of the bearing spacer 1024 is provided with a lock nut. The two ends of the screw rod support 1021 are detachably connected with the bearing seat inner pressure cover 1022 and the bearing seat outer pressure cover 1023. The fixing bolt between the screw rod support 1021 and the bearing seat outer pressure cover 1023 is sleeved with the lock washer 1026, the flat washer 1027, and the butterfly spring 1028. The screw rod nut seat 105 is provided with a cooling liquid channel. The two ends of the cooling liquid channel are a cooling liquid inlet 1051 and a cooling liquid outlet 1052. The screw rod nut seat 105 is sleeved with a screw rod nut. In this embodiment, the second screw rod seat 103 is a prior art and is not improved. The main improvement is that an elastic device is installed between the bearing seat outer pressure cover 1023 of the first screw rod seat 102 and the connecting bolt of the screw rod support 1021. The elastic device can ensure sufficient compression and ensure that the screw rod moves a certain distance away from the end when the screw rod is heated and elongated. Figure 6 The screw rod nut seat 105 is sleeved on the existing screw rod nut. The gap between the two is filled with heat-conducting silicone grease. The screw rod nut seat 105 is provided with a cooling liquid channel to cool the screw rod nut and further prevent heat from spreading to the screw rod, thereby improving the thermal stability of the screw rod. Application No. 2019209043941 discloses a ball screw with a cooling mechanism, which belongs to the field of screw rods. The ball screw comprises a screw rod, a screw rod nut sleeved on the screw rod, a motor seat connected to one end of the screw rod, and a tail end seat connected to the other end of the screw rod. The screw rod nut is provided with a cooling liquid inlet and a cooling liquid outlet. A cooling channel is arranged in the screw rod nut. One end of the cooling channel is connected to the cooling liquid inlet, and the other end is connected to the cooling liquid outlet. The distance between the cooling channel and the inner wall of the screw rod nut is 0.3-1 mm. Although the utility model is similar in principle to the above-mentioned patent, the utility model is low in modification cost and low in manufacturing difficulty. The existing screw rod can be purchased on the market for modification, so that a screw rod with good thermal stability can be obtained, and the cost control is more excellent.

[0020] Specifically, the lead screw 101, the lead screw support 1021, the bearing seat inner gland 1022 and the bearing seat outer gland 1023 are made of stainless steel, titanium alloy or alloy steel. In the embodiment, the lead screw 101, the lead screw support 1021, the bearing seat inner gland 1022 and the bearing seat outer gland 1023 made of stainless steel, titanium alloy or alloy steel are not easy to rust, have strong carrying capacity and are not easy to deform, thereby ensuring the stable operation of the lead screw 101.

[0021] Specifically, the diameter of the lead screw 101 is not less than 60 mm. In the embodiment, the lead screw with the above size is mainly used in medium and large metal cutting machine tools, thereby ensuring no deformation in use and improving the machining precision of the machine tool.

[0022] Specifically, the first lead screw seat 102 and the second lead screw seat 103 are provided with frame seals at both ends. In the embodiment, the frame seals avoid leakage of lubricating oil, thereby ensuring sufficient lubrication of the lead screw 101 and improving the service life.

[0023] Specifically, the diameter of the cooling liquid passage is not less than 5 mm. In the embodiment, the cooling liquid passage with a diameter of more than 5 mm can quickly take away the heat of the lead screw nut seat 105, thereby ensuring the stable operation of the lead screw 101 and improving the operation precision.

[0024] The basic principle, main features and advantages of the utility model are shown and described above. It should be understood by those skilled in the art that the utility model is not limited by the above embodiments, and the above embodiments and the description in the specification are only to illustrate the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model can also have various changes and improvements, and these changes and improvements all fall within the scope of the utility model claimed. The protection scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A long stroke thermally stable lead screw comprising a lead screw (101), a reducer (104), a coupling (106), characterized in that: Also include the first screw rod seat (102), the second screw rod seat (103), the screw rod nut seat (105), the screw rod (101) both ends are fixed to the first screw rod seat (102), the second screw rod seat (103), the screw rod (101) is connected with the shaft coupling (106) near the second screw rod seat (103) one end, the shaft coupling (106) is connected with the speed reducer (104), the screw rod (101) has the screw rod nut seat (105), the first screw rod seat (102) is composed of the screw rod support (1021), the bearing seat inner gland (1022), the bearing seat outer gland (1023), the bearing spacer (1024), the bearing (1025), the lock washer (1026), the flat washer (1027), the butterfly spring (1028), there are several bearings (1025) in the screw rod support (1021), the screw rod (101) passes through the inner ring of the bearing (1025), the bearing (1025) both ends have the bearing spacer (1024), the bearing spacer (1024) outside has the locking nut, the screw rod support (1021) both ends are detachably connected with the bearing seat inner gland (1022), the bearing seat outer gland (1023), the fixing bolt between the screw rod support (1021) and the bearing seat outer gland (1023) is sleeved with the lock washer (1026), the flat washer (1027), the butterfly spring (1028), the screw rod nut seat (105) has a cooling liquid channel, the cooling liquid channel both ends are cooling liquid inlet (1051), cooling liquid outlet (1052), the screw rod nut seat (105) is sleeved with the screw rod nut.

2. The long stroke thermally stable lead screw of claim 1, wherein: The screw rod (101), the screw rod support (1021), the bearing seat inner gland (1022), the bearing seat outer gland (1023) are made of stainless steel, titanium alloy or alloy steel.

3. The thermally stable long stroke lead screw of claim 1, wherein: The diameter of the screw rod (101) is not less than 60mm.

4. The thermally stable long-stroke lead screw of claim 1, wherein: The first screw rod seat (102), the second screw rod seat (103) both ends have the framework seal.

5. The thermally stable long-stroke lead screw of claim 1, wherein: The diameter of the cooling liquid channel is not less than 5mm.

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