Lightweight constant beam

Abstract

The light constant beam provided by the application comprises a precision guide rail, a support beam, a force adjusting mechanism and a load, the support beam is arranged directly above the precision guide rail, the force adjusting mechanism is slidingly installed on the support beam, the force adjusting mechanism comprises a base, a capstan, a ratchet wheel, a pawl, a volute spring, a mandrel and a pull rope, the mandrel is rotatably installed on the base, the two ends of the mandrel extend to the two sides of the base, the capstan is fixedly installed on one end of the mandrel, the pull rope is wound around the capstan, the free end of the pull rope is connected with the load, and the ratchet wheel is fixedly installed on the other end of the mandrel; the tension generated by the capstan on the other end of the mandrel is equal to the gravity of the load by rotating the ratchet wheel, so that the precision guide rail is not subjected to the force in the vertical direction, thereby realizing the constant deformation of the precision guide rail, and since the elastic modulus of the volute spring is very small, the small deformation has little influence on the elastic force of the volute spring, so that the precision guide rail is basically not subjected to the force and deformation.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of large-span cross beam, in particular to a light constant beam. BACKGROUND

[0002] Reference Figure 1 The large-span simply supported beam will bend when loaded, and produce deflection and rotation angle, which causes the position and form of the load to deviate from the expected, and the common way is to strengthen the stiffness of the beam itself to reduce the deformation of the beam, but in the case of large span, strengthening the stiffness will make the beam very heavy, and in the case of precision requirement, even if the stiffness is strengthened, different loads will also cause the beam to produce certain deformation, affecting the precision, therefore, it is urgent to provide a light constant beam without affecting the precision. SUMMARY

[0003] (I) Technical problem to be solved

[0004] In order to solve the above problems of the prior art, the present application provides a light constant beam without affecting the precision.

[0005] (II) Technical scheme

[0006] In order to achieve the above purpose, the main technical scheme adopted by the present application includes:

[0007] A light constant beam, comprising a precision guide rail, a support beam, a force adjusting mechanism and a load;

[0008] The support beam is arranged directly above the precision guide rail;

[0009] The force adjusting mechanism is slidingly installed on the support beam, and the force adjusting mechanism comprises a base, a winch, a ratchet wheel, a pawl, a scroll spring, a mandrel and a pull rope;

[0010] The mandrel is rotatably installed on the base, and the two ends of the mandrel extend to the two sides of the base;

[0011] The winch is fixedly installed on one end of the mandrel;

[0012] The pull rope is wound around the winch, and the free end of the pull rope is connected to the load;

[0013] The ratchet wheel is fixedly installed on the other end of the mandrel;

[0014] The pawl is installed on the base, and the pawl engages the ratchet wheel;

[0015] The scroll spring is fixed on the base, the inner ring of the scroll spring is connected to the mandrel, and the outer ring of the scroll spring is connected to the ratchet wheel.

[0016] Preferably, the surface of the ratchet wheel is marked with a tension scale.

[0017] Preferably, the pawl is arranged above the ratchet wheel, and the ratchet wheel is automatically engaged with the ratchet wheel under the action of the weight.

[0018] Preferably, a handle is arranged on the surface of the ratchet wheel.

[0019] Preferably, a sliding groove corresponding to the support beam is arranged on the base.

[0020] (III) Beneficial effects

[0021] The beneficial effects of the present application are as follows: by using the above technical solution, the tension generated by rotating the ratchet wheel on the other end of the spindle winch is equal to the gravity of the load, so that the precision guide rail is not subjected to a force in the vertical direction, thereby realizing constant deformation of the precision guide rail. Since the elastic modulus of the spiral spring is very small, small deformation has little effect on the elastic force of the spiral spring, so the precision guide rail is basically not subjected to force and deformation. Since the small deformation of the balance beam under load is allowed, the tension of the pull rope basically remains constant, so the balance beam only needs to meet the load strength, and the stiffness can be greatly reduced, thereby greatly reducing the total material usage in the large-span precision guide rail structure. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a schematic diagram of a large-span simply supported beam load structure in the background art;

[0023] Figure 2 It is a schematic diagram of a light constant deformation beam structure;

[0024] Figure 3 It is a schematic diagram of a force adjusting mechanism.

[0025] REFERENCE SIGNS:

[0026] 1. Precision guide rail;

[0027] 2. Support beam;

[0028] 3. Force adjusting mechanism;

[0029] 31. Base; 32. Winch; 33. Ratchet wheel; 34. Spindle; 35. Spiral spring; 36. Handle; 37. Pawl; 38. Pull rope;

[0030] 4. Load. DETAILED DESCRIPTION

[0031] In order to better explain the present application and facilitate understanding, the present application will be described in detail below with reference to the accompanying drawings and through specific embodiments.

[0032] Please refer to Figures 2 to 3The application provides a light constant beam, which comprises a precision guide rail 1, a support beam 2, a force adjusting mechanism 3 and a load 4.

[0033] The support beam 2 is arranged directly above the precision guide rail 1.

[0034] The force adjusting mechanism 3 is slidingly arranged on the support beam 2, and the force adjusting mechanism 3 comprises a base 31, a winch 32, a ratchet wheel 33, a ratchet pawl 37, a volute spring 35, a mandrel 34 and a pull rope 38.

[0035] The mandrel 34 is rotationally arranged on the base 31, and the two ends of the mandrel 34 extend to the two sides of the base 31.

[0036] The winch 32 is fixedly arranged on one end of the mandrel 34.

[0037] The pull rope 38 is wound on the winch 32, and the free end of the pull rope 38 is connected with the load 4.

[0038] The ratchet wheel 33 is fixedly arranged on the other end of the mandrel 34.

[0039] The ratchet pawl 37 is arranged on the base 31, and the ratchet pawl 37 engages with the ratchet wheel 33.

[0040] The volute spring 35 is fixed on the base 31, the inner ring of the volute spring 35 is connected with the mandrel 34, and the outer ring of the volute spring 35 is connected with the ratchet wheel 33.

[0041] In use, the ratchet wheel 33 is rotated, so that the tension generated by the winch 32 on the other end of the mandrel 34 is equal to the gravity of the load 4, the precision guide rail 1 is not subjected to the force in the vertical direction, and the constant deformation of the precision guide rail 1 is realized; the force adjusting mechanism 3 moves on the support beam 2, so that the gravity of the load 4 is applied to the support beam 2, and the support beam 2 is deformed to a certain extent; when the support beam 2 is deformed, the distance between the support beam 2 and the precision guide rail 1 is reduced, the pull rope 38 is relaxed, the winch 32 is rotated under the action of the volute spring 35, and the pull rope 38 is kept in the tension state; although the deformations of the balance beam at different positions are different, the elasticity of the volute spring 35 changes little due to the small deformation, so that the force of the pull rope 38 is basically kept constant, and the precision guide rail 1 is basically not subjected to the force and deformation.

[0042] In the embodiment, the surface of the ratchet wheel 33 is marked with a tension scale, so that the ratchet wheel 33 is rotated, and the tension of the pull rope 38 is adjusted to be equal to the weight of the load 4.

[0043] In the embodiment, the ratchet pawl 37 is arranged above the ratchet wheel 33, the ratchet wheel 33 is automatically engaged with the ratchet wheel 33 under the action of the weight, and the ratchet pawl 37 is used for fixing the adjusted ratchet wheel 33.

[0044] In this embodiment, the ratchet wheel 33 is provided with a handle 36, so as to facilitate the rotation of the ratchet wheel 33.

[0045] In this embodiment, the base 31 is provided with a sliding groove corresponding to the support beam 2.

[0046] The working principle of the present application is as follows:

[0047] By rotating the ratchet wheel 33, the tension generated by the capstan 32 at the other end of the mandrel 34 is equal to the gravity of the load 4, so that the precision guide rail 1 is not subjected to the force in the vertical direction, thereby realizing the constant deformation of the precision guide rail 1, and the force adjusting mechanism 3 moves on the support beam 2, so that the gravity of the load 4 acts on the support beam 2, therefore, the support beam 2 will be deformed to a certain extent, when the support beam 2 is deformed, the distance between the support beam 2 and the precision guide rail 1 becomes smaller, so that the pull rope 38 is relaxed, under the action of the spiral spring 35, the capstan 32 rotates, so that the pull rope 38 is kept in tension, although the deformation of the balance beam at each position is different, but due to the small deformation, the spring force of the spiral spring 35 changes little, so that the tension of the pull rope 38 is basically kept constant, thereby ensuring that the precision guide rail 1 is basically not subjected to force and deformation.

[0048] The above is only an embodiment of the present application, and does not limit the patent scope of the present application, any equivalent transformation or direct or indirect application in related technical field based on the content of the present application is also included in the patent protection scope of the present application.

[0049] In addition, it should be understood that although the present application is described in the form of embodiments, not every embodiment contains only one independent technical solution, and the description manner of the specification is only for the sake of clarity, and the person skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be combined to form other embodiments which can be understood by the person skilled in the art.

Claims

1. A lightweight constant beam, characterized by, The device comprises a precision guide rail, a support beam, a force adjusting mechanism and a load. The support beam is arranged directly above the precision guide rail. The force adjusting mechanism is slidingly installed on the support beam and comprises a base, a capstan, a ratchet wheel, a pawl, a volute spring, a mandrel and a pull rope. The mandrel is rotationally installed on the base and extends to both sides of the base. The capstan is fixedly installed on one end of the mandrel. The pull rope is wound around the capstan and the free end of the pull rope is connected to the load. The ratchet wheel is fixedly installed on the other end of the mandrel. The pawl is installed on the base and engages the ratchet wheel. The volute spring is fixed on the base, the inner ring of the volute spring is connected to the mandrel, and the outer ring of the volute spring is connected to the ratchet wheel.

2. A lightweight constant-depth beam according to claim 1, wherein The surface of the ratchet wheel is marked with a tension scale.

3. A lightweight constant-depth beam according to claim 1, wherein The pawl is arranged above the ratchet wheel and automatically engages the ratchet wheel under the action of weight.

4. A lightweight constant-depth beam according to claim 1, wherein A handle is installed on the surface of the ratchet wheel.

5. A lightweight constant-depth beam according to claim 1, wherein A sliding groove corresponding to the support beam is formed in the base.

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