Lever type adjustable load support hanger

Abstract

The present application relates to a kind of pipeline support hanger used in heat system, belong to support hanger technical field.The purpose is to provide a kind of support hanger with "load gradually increases when hanging point upward displacement", including lug, frame, lever, hanging point, main shaft, lower limit, adjustable connecting rod, counterweight, slider, horizontal limit, rigid component in it is connected into connecting rod mechanism with low pair.The connecting rod mechanism utilizes lever principle, the change of long arm length in the movement process of lever produces the effect of support hanger load increase, to realize the function of "load gradually increases when hanging point upward displacement";The length of adjustable connecting rod can be adjusted within a certain range, with "load change rate adjustable" function.It can be used to control pipe system subsidence, improve pipe deformation and optimize pipe system stress state etc..

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of pipe support and hanger, and particularly relates to a pipe support and hanger used in a thermal system. BACKGROUND

[0002] There are various thermal pipelines in a thermal system (for example, a thermal power generation system, a petroleum chemical industry system, a metallurgical system, etc.), including steam pipelines, steam-water pipelines, etc. A support and hanger is an important component of a pipeline system, including various components or devices for bearing loads, limiting displacement, controlling vibration, and transmitting loads to a bearing structure (a civil foundation, etc.), and normal service of the support and hanger is of great significance to safe and stable operation of various thermal pipelines.

[0003] At present, commonly used support and hangers in a thermal system include variable force spring support and hangers (hereinafter referred to as elastic hangers), constant force spring support and hangers (hereinafter referred to as constant hangers), rigid support and hangers, rigid support and hangers, sliding (rolling) support and hangers, etc. Elastic hangers and constant hangers are commonly used in engineering to bear loads in the vertical direction generated by self weight and displacement changes of pipelines during cold and hot changes. When a hanger point is displaced downward, the elastic hanger can gradually increase the load, and vice versa, when the hanger point is displaced upward, the load is gradually reduced. The constant hanger can achieve a substantially constant load. It can be seen that both types of support and hangers lack the important function of gradually increasing the load when the hanger point is displaced upward. This function has certain range of needs in actual engineering applications, for example, for controlling the sinking of a pipeline system caused by manufacturing wall thickness deviation, insulation weight deviation, etc. of the pipeline; for improving the deformation caused by the insufficient rigidity of the pipeline itself and unable to realize upward free expansion displacement (for example, deformation control of an upper and lower suspension type tube panel in a circulating fluidized bed boiler); and for making it possible to simultaneously perform cold hanger zero and hot hanger zero in pipeline stress analysis and calculation, so as to improve the stress level of the pipeline system and reduce the stress and torque of the equipment port, etc. SUMMARY

[0004] The present application aims to provide a support and hanger with the functions of gradually increasing the load when the hanger point is displaced upward and adjusting the load change rate, so as to solve the problems in the background.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions.

[0006] In the cold state, the counterweight is in the original position and suspends the hanged object through the lever, and the hanged object (for example, a pipeline, etc.) is in the cold state position.

[0007] In the hot state, the lever rotates downward by a certain angle around the fulcrum with the gradual upward displacement of the hanged object, and at the same time, the counterweight is pushed outward to the rear end of the lever far end under the action of the connecting rod mechanism to reach the terminal position, and the hanged object (for example, a pipeline, etc.) is in the hot state position.

[0008] Compared with existing technologies, this invention has the following advantages: the support bracket utilizes the lever principle to suspend the load; it uses a linkage mechanism to achieve a gradual increase in load as the lifting point moves upward; the linkage length is adjustable, providing a "load change rate" adjustment function. It adopts a fully mechanical metal structure, featuring a compact structure, simple manufacturing process, convenient installation, stable operation, and easy load adjustment. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of one embodiment of the present invention.

[0010] Figure 2 This is a schematic diagram of a linkage mechanism of the present invention. Detailed Implementation

[0011] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0012] This embodiment presents a lever-type adjustable load support bracket, such as... Figure 1 As shown, the structure includes a lifting lug 1, a frame 2, a lever 3, a hanging point 4, a main shaft 5, a lower limit 6, an adjustable connecting rod 7, a counterweight 8, a slider 9, and a horizontal limit 10. The frame 2, lever 3, main shaft 5, adjustable connecting rod 7, and slider 9 are rigidly connected by a lower pair to form a linkage mechanism. The hanging point 4 is hinged to the lever 3 after suspending the load. The slider 9 can slide on the lever 3 after suspending the counterweight 8. The lever 3 rotates around the main shaft 5 fixed to the frame 2. The adjustable connecting rod 7 rotates around the hinge point fixed to the frame 2 and is hinged to the slider 9. The lower limit 6 is fixed to the frame 2, and the horizontal limit 10 is fixed to the lever 3. The lifting lug 1 suspends the frame 2 and is connected to the foundation structure.

[0013] In the cold state, slider 9, together with the suspended counterweight 8, is in its original position and "prys up" the suspended object (e.g., a steam pipe) via lever 3. The weight, initial position, and displacement of counterweight 8 are determined according to the lever principle.

[0014] When in a hot state, the suspended object needs to be moved upward to the hot position as the pipe expands. As the suspended object gradually rotates upward, the short arm of lever 3 rotates downward around the main shaft 5 (fulcrum) at a certain angle. At the same time, the slider 9, together with the suspension counterweight 8, is pushed outward to the far end of lever 3 under the action of the adjustable connecting rod 7 to reach the end position.

[0015] Adjusting the length of the adjustable link 7 will change the motion parameters of the linkage mechanism accordingly, and it has a "load change rate" adjustment function (see "Example Calculation" for details).

[0016] When the unexpected cause causes the lever 3 to possibly exceed the lower stroke, the lower limit 6 will prevent the lever from continuing to descend; when the unexpected cause causes the slider 9 to possibly disengage the lever, the horizontal limit 10 will prevent the slider 9 from flying off.

[0017] Calculation formula

[0018] According to Figure 2 From the schematic diagram of the linkage mechanism, it can be seen that the motion trajectory of the slider is to slide on the lever while making a circular motion around the fulcrum O' with a radius of r. Through the trigonometric function relationship, the function expression between the distance (b) of the slider from the fulcrum O and the lever rotation angle (α) and the related parameters can be obtained.

[0019] The known conditions are: the distance (L) between the two fulcrums O and O', the radius (r) of the adjustable connecting rod, and the length (a) of the short arm of the lever.

[0020] (1) Function expression: b 2 +L 2 -r 2 -2bL COSα=0

[0021] It is obtained that: b =(2LCOSα±((2LCOSα) 2 -4×(L 2 -r 2 )) -2 ) / 2

[0022] It can be seen that the relationship between the length b and the angle α is a quadratic equation with a trigonometric function.

[0023] (2) Slider limit stroke calculation: When α=0°, the linkage mechanism is at the limit stroke position, COSα=1 is substituted into the function expression: b 2 +L 2 -r 2 -2bL COSα=0, and (b-L) 2 = r 2

[0024] That is: the remote point = L+r, the near point = L-r, and the actual application is the remote point.

[0025] (3) Linkage mechanism dead point calculation: When the lever and the circular trajectory of the slider (making a variable circular motion around the fulcrum O' with a radius of r) are tangent, the linkage mechanism dead point is reached, that is: α= arcsin(r / L). When designing, attention should be paid to the selection of L, r, and α to avoid the lever reaching the dead point during rotation.

[0026] (4) Support and hanger load: G1=(b×G2) / a, where G2 is the counterweight load.

[0027] (5) Load change rate: △G1

[0028] Example calculation

[0029] Let short arm a = 200 mm, distance L between two fulcrums O and O' = 650 mm, adjustable connecting rod length r = 350-450 mm, substitute into the function expression: b 2 +L 2 -r 2 -2bL COSα=0, in practical application, the value range of α is: 15-0° (simulating the upward displacement of the lifting point), counterweight G2 = 2000 N (i.e. 200 Kg counterweight), solve the lever long arm b, support hanger load G1, load change rate AG1:

[0030] When r = 350 mm: b = 935-1000 (mm), G1 = 9350-10000 (N), AG1 = 7%;

[0031] When r = 400 mm: b = 991-1050 (mm), G1 = 9910-10500 (N), AG1 = 6%;

[0032] When r = 450 mm: b = 1045-1100 (mm), G1 = 10450-11000 (N), AG1 = 5%.

[0033] It can be seen that the lever long arm b changes, causing the support hanger load G1 to increase, thereby realizing the support hanger with the function of "gradually increasing load when the lifting point is displaced upward"; since b depends on L and r, and r can be adjusted within a certain range, i.e. the support hanger has the "load change rate" adjustment function.

[0034] The above-described embodiments only express one specific implementation of the present application, and on the premise of not departing from the concept of the present application, the technical solutions can be improved and changed according to test requirements, such as adjusting the adjustment range of the adjustable connecting rod 7, changing the distance between the two fulcrums and the lever length, etc. to adapt to various support hanger application environments, which also belong to the protection range of the present application, and the protection range of the present application should be subject to the appended claims.

Claims

1. A lever adjustable load support hanger characterized by, The utility model relates to a lifting device, including lug (1), frame (2), lever (3), hanging point (4), main shaft (5), lower limit (6), adjustable connecting rod (7), counterweight (8), slider (9), horizontal limit (10), wherein, the hanging point (4) is hanged and is articulated with lever (3) after the suspension of the lifting object, slider (9) is hanged and is articulated with frame (2) through adjustable connecting rod (7) after the suspension of counterweight (8), forms rigid low secondary connecting rod mechanism, slider (9) can slide on lever (3) after the suspension of counterweight (8), lever (3) rotates around main shaft (5) fixed on frame (2), lower limit (6) is fixed on frame (2), horizontal limit (10) is fixed on lever (3), lug (1) is connected with the base structure after the suspension of frame (2), make slider (9) slide along lever (3) to automatically increase load when lifting point displaces upward, the length of adjustable connecting rod (7) can be adjusted, through the change connecting rod mechanism motion parameter, make load change rate adjustable in 5 %-7 % range.

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