A measuring device for the convex shoulder of a mushroom-type blade root

Abstract

The present invention provides a measurement device for a mushroom-type blade root shoulder, which includes a base body, a screw rod, a hand wheel, a first cover plate, a second cover plate, a first shoulder measurement piece and a second shoulder measurement piece; the base body is provided with a first installation part, a second installation part and a third installation part, and the screw rod passes through the hand wheel and is embedded in the first installation part; the first cover plate and the second cover plate are respectively installed on the second installation part and the third installation part; the first cover plate and the second installation part cooperate to form a first installation groove, and the first shoulder measurement piece can slide freely along the first installation groove; the second cover plate and the third installation part cooperate to form a second installation groove, and the second shoulder measurement piece can slide freely along the second installation groove; the first shoulder measurement piece and the second shoulder measurement piece are constructed to form a first clamping space for abutting against the first shoulder of the mushroom-type blade root. This measurement device is simple to operate, accurate in positioning and measurement, improves the detection efficiency and quality of the mushroom-type blade root, and reduces the processing cost.

Description

Technical Field

[0001] The present invention relates to the technical field of blade root shoulders, and particularly to a measurement device for a mushroom-shaped blade root shoulder. Background Art

[0002] In a steam turbine, the rotor and the moving blades are its main moving components. When the rotor rotates at a high speed, the part that fixes the moving blade to the rotor is the blade root. Common blade root forms include inverted T-shaped, externally wrapped T-shaped, double inverted T-shaped, fork-shaped, fir-tree-shaped, and mushroom-shaped. Shorter straight blades usually adopt inverted T-shaped, externally wrapped T-shaped, and double inverted T-shaped; longer variable cross-section blades usually adopt fir-tree-shaped, fork-shaped blade roots and mushroom-shaped blade roots. Among them, in the prior art, the last few stages of moving blade roots in the low-pressure section of medium and large units usually adopt fir-tree-shaped and fork-shaped blade roots. The fir-tree-shaped blade root has a complex shape and many assembly surfaces. To ensure good contact surfaces between pairs of teeth, high machining accuracy and complex processes are required. Moreover, due to a large number of teeth and small transition fillets, large stress concentrations are likely to occur; although the fork-shaped blade root is convenient to machine, due to the full-circle riveting, the assembly is difficult, the assembly efficiency is low, the riveting quality is unstable, and when the number of forks is large, the axial dimension is large and the cost increases.

[0003] Compared with the fir-tree-shaped blade root, the mushroom-shaped blade root is more convenient to machine; compared with the fir-tree-shaped blade root, it has higher assembly efficiency and lower cost. The mushroom-shaped blade root is a blade root with a relatively reasonable load distribution and good load-bearing capacity, and is widely used in high-speed industrial steam turbines. However, the mushroom-shaped blade root has high precision requirements. The shoulder is the main load-bearing surface, and blade vibration will transmit additional dynamic stress to the blade root shoulder, resulting in large stress concentrations. Therefore, it is extremely important to measure the accuracy of the blade root shoulder during the machining process.

[0004] The traditional measurement method for the mushroom-shaped blade root shoulder is to clamp a dial indicator on a machine tool and measure multiple measurement points on multiple shoulders of the blade root by the moving distance of the machine tool and the readings of the dial indicator. The operation is complex. Due to the machine tool error and the measurement error of the dial indicator, the accuracy of this measurement method is not high, and repeated measurements are required to ensure accuracy.

[0005] Therefore, to solve the above problems, the present invention proposes a new measurement device for the mushroom-shaped blade root shoulder to improve the detection efficiency and quality of the mushroom-shaped blade root and reduce the processing cost of the mushroom-shaped blade root. Summary of the Invention

[0006] Based on the above description, the present invention provides a measurement device for a mushroom-shaped blade root shoulder to solve the technical problems of complex measurement operation and low measurement accuracy of the mushroom-shaped blade root shoulder in the prior art.

[0007] The technical solution of the present invention to solve the above technical problems is as follows:

[0008] The present invention provides a measuring device for the convex shoulder of a mushroom-shaped blade root, comprising: a base body, a screw rod, a hand wheel, a first cover plate, a second cover plate, a first convex shoulder measuring member and a second convex shoulder measuring member;

[0009] The base body is provided with a first mounting portion, a second mounting portion and a third mounting portion. The screw rod passes through the hand wheel and is embedded in the first mounting portion. The first cover plate and the second cover plate are respectively mounted on the second mounting portion and the third mounting portion;

[0010] Wherein, a first mounting groove is formed by the cooperation of the first cover plate and the second mounting portion, and the first convex shoulder measuring member can freely slide along the first mounting groove; a second mounting groove is formed by the cooperation of the second cover plate and the third mounting portion, and the second convex shoulder measuring member can freely slide along the second mounting groove; the first convex shoulder measuring member and the second convex shoulder measuring member form a first clamping space for abutting against the first convex shoulder of the mushroom-shaped blade root.

[0011] On the basis of the above technical solution, the present invention can be further improved as follows.

[0012] Further, the first cover plate is detachably mounted on the second mounting portion by screws.

[0013] Further, the second cover plate is detachably mounted on the third mounting portion by screws.

[0014] Further, the measuring device for the convex shoulder of the mushroom-shaped blade root further comprises a third convex shoulder measuring member and a fourth convex shoulder measuring member;

[0015] A third mounting groove is formed by the cooperation of the first cover plate and the second mounting portion, and the third convex shoulder measuring member can freely slide along the third mounting groove;

[0016] A fourth mounting groove is formed by the cooperation of the second cover plate and the third mounting portion, and the fourth convex shoulder measuring member can freely slide along the fourth mounting groove;

[0017] The third convex shoulder measuring member and the fourth convex shoulder measuring member form a second clamping space for abutting against the second convex shoulder of the mushroom-shaped blade root.

[0018] Further, the measuring device for the convex shoulder of the mushroom-shaped blade root further comprises a fifth convex shoulder measuring member and a sixth convex shoulder measuring member;

[0019] A fifth mounting groove is formed by the cooperation of the first cover plate and the second mounting portion, and the fifth convex shoulder measuring member can freely slide along the fifth mounting groove;

[0020] A sixth mounting groove is formed by the cooperation of the second cover plate and the third mounting portion, and the sixth convex shoulder measuring member can freely slide along the sixth mounting groove;

[0021] The fifth shoulder measuring member and the sixth shoulder measuring member are constructed to form a third clamping space for abutting against the third shoulder of the mushroom root.

[0022] Furthermore, the first shoulder measuring member, the third shoulder measuring member, and the fifth shoulder measuring member are arranged in a stepped manner in sequence.

[0023] Furthermore, the second shoulder measuring member, the fourth shoulder measuring member, and the sixth shoulder measuring member are arranged in a stepped manner in sequence.

[0024] Furthermore, the size of the first clamping space is smaller than the size of the second clamping space, and the size of the second clamping space is smaller than the size of the third clamping space.

[0025] Furthermore, the base body, the first shoulder measuring member, the second shoulder measuring member, the third shoulder measuring member, the fourth shoulder measuring member, the fifth shoulder measuring member, and the sixth shoulder measuring member are all made of carbon tool steel.

[0026] Furthermore, the first cover plate and the second cover plate are both made of carbon structural steel.

[0027] Compared with the prior art, the technical solution of the present application has the following beneficial technical effects:

[0028] The mushroom root shoulder measuring device provided by the present invention is provided with a base body, a screw rod, a hand wheel, a first cover plate, a second cover plate, a first shoulder measuring member, and a second shoulder measuring member. The screw rod passes through the hand wheel and is embedded in the first installation part of the base body. The end of the screw rod can abut against the root of the mushroom root. The first shoulder measuring member is inserted into the installation groove formed between the first cover plate and the second installation part of the base body, and the second shoulder measuring member is inserted into the installation groove formed between the second cover plate and the third installation part of the base body. The two shoulder measuring members are constructed to form a first clamping space adapted to the mushroom root shoulder. Both of the two shoulder measuring members can freely slide along their respective installation grooves to achieve abutting and fitting with the mushroom root shoulder, accurately positioning the position of the mushroom root shoulder, that is, the radial dimension of the mushroom root shoulder can be indirectly measured through the shoulder measuring member.

[0029] Compared with the prior art, the mushroom root shoulder measuring device provided by the present invention has the following beneficial effects: The measuring device is simple to operate and accurate in measurement, and can be measured without excessive adjustment; the positioning is accurate, the efficiency is high, it meets the product process and technical requirements, can be reused, and is suitable for popularization in the measurement of the mushroom root shoulder, which is beneficial to improving the detection efficiency and quality of the mushroom root and reducing the processing cost of the mushroom root; in addition, not only can the mushroom root be measured, but also samples with a similar structural form can be measured, and the applicability is wider. Description of the Drawings

[0030] Figure 1 This is a schematic structural diagram of the mushroom-shaped blade root shoulder measuring device provided by an embodiment of the present invention;

[0031] Figure 2 This is a schematic structural diagram of the base body provided by an embodiment of the present invention;

[0032] Figure 3 This is a schematic diagram of the application scenario of the mushroom-shaped blade root shoulder measuring device provided by an embodiment of the present invention;

[0033] In the drawings, the list of components represented by each reference numeral is as follows:

[0034] 1. Base body; 2. Screw; 3. Handwheel; 4. First cover plate; 5. Second cover plate; 6. First shoulder measuring member; 7. Second shoulder measuring member; 8. Third shoulder measuring member; 9. Fourth shoulder measuring member; 10. Fifth shoulder measuring member; 11. Sixth shoulder measuring member; 12. Mushroom-shaped blade root. Detailed Embodiments

[0035] To facilitate the understanding of the present application, the present application will be described more comprehensively below with reference to the relevant drawings. Embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[0036] In the description of the embodiments of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0037] In addition, the terms "first", "second", "third", "fourth", "fifth", and "sixth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0038] The following combines the attached Figures 1 to 3 and the embodiments to further describe in detail the implementation manners of the present invention. The following embodiments are used to illustrate the present invention but cannot be used to limit the scope of the present invention.

[0039] As Figure 1 shown, the mushroom-shaped blade root shoulder measuring device provided by the embodiment of the present invention includes: a base body 1, a screw 2, a handwheel 3, a first cover plate 4, a second cover plate 5, a first shoulder measuring member 6, and a second shoulder measuring member 7.

[0040] As Figure 2 shown, the base body 1 is provided with a first mounting portion, a second mounting portion and a third mounting portion. The screw rod 2 passes through the hand wheel 3 and is embedded in the first mounting portion; the first cover plate 4 and the second cover plate 5 are respectively mounted on the second mounting portion and the third mounting portion.

[0041] Among them, the first cover plate 4 and the second mounting portion cooperate to form a first mounting groove, and the first shoulder measuring member 6 can freely slide along the first mounting groove; the second cover plate 5 and the third mounting portion cooperate to form a second mounting groove, and the second shoulder measuring member 7 can freely slide along the second mounting groove.

[0042] The first shoulder measuring member 6 and the second shoulder measuring member 7 are constructed to form a first clamping space for abutting against the first shoulder of the fungal blade root 12.

[0043] Specifically, for the fungal blade root shoulder measuring device base body 1, screw rod 2, hand wheel 3, first cover plate 4, second cover plate 5, first shoulder measuring member 6 and second shoulder measuring member 7 provided in the embodiments of the present invention, the base body 1 is convex at the top and concave at the bottom. A screw hole is provided at the inner bottom of the concave shape of the base body 1. The screw rod 2 is screwed into the screw hole. The screw rod 2 is embedded in the hand wheel 3. The hand wheel 3 is fixed on the screw rod 2 by a slotted flat end set screw. That is, the screw rod 2 passes through the hand wheel 3 and is embedded in the first mounting portion of the base body 1. The end of the screw rod 2 can abut against the root of the fungal blade root 12.

[0044] The first shoulder measuring member 6 is inserted between the first cover plate 4 and the second mounting portion of the base body 1 to form a first mounting groove. The second shoulder measuring member 7 is inserted between the second cover plate 5 and the third mounting portion of the base body 1 to form a second mounting groove. The two shoulder measuring members are constructed to form a first clamping space adapted to the shoulder of the fungal blade root. Both shoulder measuring members can freely slide along their respective mounting grooves to achieve abutting and fitting with the shoulder of the fungal blade root 12, so as to accurately position the position of the shoulder of the fungal blade root 12. That is, the radial dimension of the shoulder of the fungal blade root 12 can be indirectly measured through the shoulder measuring member.

[0045] Compared with the prior art, the fungal blade root shoulder measuring device provided by the embodiments of the present invention has the following beneficial effects: The measuring device is simple to operate and accurate in measurement, and can be measured without excessive adjustment; the positioning is accurate, the efficiency is high, it meets the product process and technical requirements, and can be reused. It is suitable for popularization in the measurement of the fungal blade root shoulder, which is beneficial to improving the detection efficiency and quality of the fungal blade root and reducing the processing cost of the fungal blade root; in addition, it can not only measure the fungal blade root, but also measure samples with similar structural forms, and has a wider applicability.

[0046] On the basis of the above embodiments, further, for the convenience of installation, disassembly and maintenance, the cover plate and the base body 1 are installed in a detachable connection manner, such as Figure 1As shown, the first cover plate 4 is detachably mounted on the second mounting portion by screws; the second cover plate 5 is detachably mounted on the third mounting portion by screws.

[0047] In a specific example, as Figure 1 shown, three square grooves are provided on each of the two concave sides of the base body 1, and two slotted countersunk screws are provided on the convex portion on one side of each square groove.

[0048] Based on the above embodiments, further, as Figure 3 shown, in order to adapt the device to the dovetail root 12, the dovetail root shoulder measuring device further includes a third shoulder measuring member 8 and a fourth shoulder measuring member 9 to increase the number of shoulder measurements.

[0049] As Figure 1 shown, the first cover plate 4 and the second mounting portion cooperate to form a third mounting groove, and the third shoulder measuring member 8 can slide freely along the third mounting groove.

[0050] The second cover plate 5 and the third mounting portion cooperate to form a fourth mounting groove, and the fourth shoulder measuring member 9 can slide freely along the fourth mounting groove.

[0051] The third shoulder measuring member 8 and the fourth shoulder measuring member 9 construct a second clamping space for abutting against the second shoulder of the dovetail root 12 to realize the measurement of the second shoulder.

[0052] Based on the above embodiments, further, as Figure 3 shown, in order to adapt the device to the dovetail root 12, the dovetail root shoulder measuring device further includes a fifth shoulder measuring member 10 and a sixth shoulder measuring member 11 to further increase the number of shoulder measurements, enlarge the applicable range of the device, and improve its applicability.

[0053] The first cover plate 4 and the second mounting portion cooperate to form a fifth mounting groove, and the fifth shoulder measuring member 10 can slide freely along the fifth mounting groove.

[0054] The second cover plate 5 and the third mounting portion cooperate to form a sixth mounting groove, and the sixth shoulder measuring member 11 can slide freely along the sixth mounting groove.

[0055] The fifth shoulder measuring member 10 and the sixth shoulder measuring member 11 construct a third clamping space for abutting against the third shoulder of the dovetail root 12 to realize the measurement of the third shoulder.

[0056] In actual operation, the number of shoulder measuring members can be increased or decreased as needed to adapt to dovetail roots with different numbers of shoulders.

[0057] On the basis of the above embodiments, further, the first shoulder measuring member 6, the third shoulder measuring member 8, and the fifth shoulder measuring member 10 are arranged in a stepped manner in sequence.

[0058] The second shoulder measuring member 7, the fourth shoulder measuring member 9, and the sixth shoulder measuring member 11 are arranged in a stepped manner in sequence.

[0059] The size of the first clamping space is smaller than that of the second clamping space, and the size of the second clamping space is smaller than that of the third clamping space.

[0060] Specifically, as Figure 2 shown, both the first cover plate 4 and the second cover plate 5 are stepped, with 6 through holes arranged along the radial direction, 2 in a row and 3 rows. The slotted countersunk head screws pass through the through holes to fix the first cover plate 4 and the second cover plate 5 on the base body 1.

[0061] On the basis of the above embodiments, further, the materials of the base body 1, the first shoulder measuring member 6, the second shoulder measuring member 7, the third shoulder measuring member 8, the fourth shoulder measuring member 9, the fifth shoulder measuring member 10, and the sixth shoulder measuring member 11 are all carbon tool steel.

[0062] On the basis of the above embodiments, further, the materials of the first cover plate 4 and the second cover plate 5 are both carbon structural steel.

[0063] The usage method of the mushroom root shoulder measuring device provided by the embodiment of the present invention is as follows:

[0064] First, insert the mushroom root 12 into the accommodation space of the base body 1; then, insert the shoulder measuring members into the installation grooves in sequence. The shoulder measuring members protrude, ensuring that the shoulder measuring members are parallel to the shoulders of the mushroom root 12. Rotate the handwheel 3 to adjust the screw rod 2, and the top of the screw rod 2 contacts the outer circle of the mushroom root 12. Continue to adjust to make the mushroom root shoulder close to the shoulder measuring member. Pay attention to observing the contact situation between the mushroom root shoulder and the shoulder measuring member during the adjustment process. Through the shoulder measuring member and the screw rod 2, the measuring tool is stably clamped on the mushroom root, that is, the positioning of the mushroom root shoulder of the mushroom root 12 is realized by using the shoulder measuring member; finally, measure the gap between the shoulder measuring block and the mushroom root shoulder to indirectly measure the radial dimension of the mushroom root shoulder.

[0065] Compared with the prior art, the mushroom root shoulder measuring device provided by the embodiment of the present invention uses the mushroom root 12 shoulder part and the root shoulder radial positioning. By rotating the handwheel 3 to adjust the screw rod 2, the root shoulder contacts the outer circle of the root and is fixed. The radial dimension of the mushroom root shoulder of the mushroom root 12 is indirectly measured through the shoulder measuring member. This measuring tool is simple to operate, accurate in measurement, and can be measured without excessive adjustment. It is simple to operate, accurate in positioning, high in efficiency, meets the product process and technical requirements, can be reused, and is suitable for popularization for the measurement of the mushroom root 12 shoulder.

[0066] In addition, the measurement device for the mushroom-shaped blade root shoulder can not only measure the mushroom-shaped blade roots 12 with two or three shoulders, but also measure the mushroom-shaped blade roots with multiple shoulders. It can not only measure the mushroom-shaped blade roots, but also measure the blades with multiple shoulders and similar structural forms, and has a wide range of applications.

[0067] In the description of this specification, the description referring to terms such as "specific examples" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A measuring device for the convex shoulder of a mushroom-type blade root, characterized in that, Comprising: a base body, a screw rod, a hand wheel, a first cover plate, a second cover plate, a first shoulder measuring member and a second shoulder measuring member; The base body is provided with a first mounting portion, a second mounting portion and a third mounting portion, and the screw rod passes through the hand wheel and is embedded in the first mounting portion; the first cover plate and the second cover plate are respectively mounted on the second mounting portion and the third mounting portion; Wherein, the first cover plate and the second mounting portion cooperate to form a first mounting groove, and the first shoulder measuring member can freely slide along the first mounting groove; the second cover plate and the third mounting portion cooperate to form a second mounting groove, and the second shoulder measuring member can freely slide along the second mounting groove; the first shoulder measuring member and the second shoulder measuring member construct a first clamping space for abutting against the first shoulder of the mushroom-shaped blade root; The first cover plate is detachably mounted on the second mounting portion by screws; The mushroom-shaped blade root shoulder measuring device further includes a third shoulder measuring member and a fourth shoulder measuring member; The first cover plate and the second mounting portion cooperate to form a third mounting groove, and the third shoulder measuring member can freely slide along the third mounting groove; The second cover plate and the third mounting portion cooperate to form a fourth mounting groove, and the fourth shoulder measuring member can freely slide along the fourth mounting groove; The third shoulder measuring member and the fourth shoulder measuring member construct a second clamping space for abutting against the second shoulder of the mushroom-shaped blade root; The mushroom-shaped blade root shoulder measuring device further includes a fifth shoulder measuring member and a sixth shoulder measuring member; The first cover plate and the second mounting portion cooperate to form a fifth mounting groove, and the fifth shoulder measuring member can freely slide along the fifth mounting groove; The second cover plate and the third mounting portion cooperate to form a sixth mounting groove, and the sixth shoulder measuring member can freely slide along the sixth mounting groove; The fifth shoulder measuring member and the sixth shoulder measuring member construct a third clamping space for abutting against the third shoulder of the mushroom-shaped blade root.

2. The fungal blade root shoulder measuring device according to claim 1, characterized in that, The second cover plate is detachably mounted on the third mounting portion by screws.

3. The measurement device for the mushroom-type blade root shoulder according to claim 1, characterized in that, The first shoulder measuring member, the third shoulder measuring member and the fifth shoulder measuring member are arranged in a stepped manner in sequence.

4. The measurement device for the fungal blade root shoulder according to claim 3, wherein The second shoulder measuring member, the fourth shoulder measuring member and the sixth shoulder measuring member are arranged in a stepped manner in sequence.

5. The mushroom-type blade root shoulder measuring device according to claim 4, wherein, The size of the first clamping space is smaller than the size of the second clamping space, and the size of the second clamping space is smaller than the size of the third clamping space.

6. The measuring device for the fungal blade root shoulder according to claim 5, characterized in that, The materials of the base body, the first shoulder measuring member, the second shoulder measuring member, the third shoulder measuring member, the fourth shoulder measuring member, the fifth shoulder measuring member and the sixth shoulder measuring member are all carbon tool steel.

7. The shank type blade root shoulder measuring device according to claim 1, characterized in that The materials of the first cover plate and the second cover plate are both carbon structural steel.

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