Protective tool

Abstract

The utility model relates to a protection tool. The protection tool is characterized in that a top gland is provided with a first top accommodating groove; the top protection shell is provided with a second top containing groove, and the opening direction of the second top containing groove is opposite to the opening direction of the first top containing groove. The bottom protection shell is provided with a first bottom containing groove, and the bottom protection shell is connected with the outer surface of the bottom plate of the top protection shell. The bottom support is provided with a second bottom containing groove, the opening direction of the second bottom containing groove is opposite to the opening direction of the first bottom containing groove, and a connecting column is fixedly connected to the outer surface of a bottom plate of the bottom support. The top limiting structure is arranged between the top gland and the top protective shell to limit the position between the two; the bottom limiting structure is arranged between the bottom support and the bottom protective shell to limit the position between the bottom support and the bottom protective shell. The thermal barrier coatings of two concatemer guide blades can be prepared at the same time, and the preparation cost is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of preparation of thermal barrier coatings for blades, in particular to a protective tooling. Background Art

[0002] Thermal barrier coating technology is an essential technology for manufacturing hot end components of modern advanced aircraft engines and gas turbines. It plays an important role in improving the life of hot end components and engine performance. The turbine guide vanes of aircraft engines are usually multi-unit structures with large size, heavy weight and complex structure. When thermal barrier coating is prepared on multi-unit guide vanes by EB-PVD technology, it has the following characteristics: (1) It needs to be carried out in a vacuum environment; (2) The guide vanes to be coated with thermal barrier coating need to rotate at a certain speed; (3) The thermal barrier coating only needs to be prepared on the flow path surface of the multi-unit guide vanes, and the non-coated area needs to be protected by special protective tooling; (4) The deposition rate of EB-PVD coating is low and the cost is high. In view of the above characteristics, the EB-PVD equipment is designed with two vacuum chambers, the pre-vacuum chamber and the main deposition chamber. Each sealing position needs to have good sealing performance. The sealing position of the horizontal rotating axis is on the wall of the pre-vacuum chamber. Reliable sealing must be achieved while ensuring the effective rotation of the horizontal axis. The sealing position of the wall of the pre-vacuum chamber is also the only supporting point for the horizontal rotating axis to enter the vacuum chamber. The distance between this supporting point and the center of the target material is usually greater than 1.5m. Therefore, in the EB-PVD coating preparation process, the horizontal rotating axis is a typical cantilever beam structure and is also the key position of vacuum leakage.

[0003] According to the coating area and clamping requirements of the thermal barrier coating of the turbine guide vane, it is necessary to use a tooling to protect the non-coating area, and the process characteristics of the coating deposition (the deposition temperature is usually 800-1000°C) require the use of thicker metal tooling for protection, which further increases the weight of the clamped workpiece. After the turbine guide vane is clamped and protected with a tooling, the assembly is installed at one end of the horizontal rotating shaft, which increases the load at the fulcrum of the horizontal rotating shaft. Usually, the center of gravity of the assembly is not on the axis of the horizontal rotating shaft, resulting in a certain anti-centrifugal force acting on the support point of the horizontal rotating shaft at the wall of the pre-vacuum chamber. During the coating deposition process, the horizontal rotating shaft needs to work for a long time at a speed of about 20rpm to 50rpm, which aggravates the risk of wear and vacuum leakage at the support point, and cannot ensure sealing. In addition, the furnace loading capacity of the prior art for preparing the thermal barrier coating of the multi-unit guide vane is usually one furnace, and the coating deposition rate is low and the cost is high. Utility Model Content

[0004] The utility model provides a protective tooling to solve the technical problem of high cost when preparing thermal barrier coatings for multi-unit guide blades.

[0005] The utility model provides a protective tooling, comprising:

[0006] A top gland having a first top receiving groove;

[0007] A top protective shell having a second top receiving groove, wherein an opening direction of the second top receiving groove is opposite to an opening direction of the first top receiving groove;

[0008] A bottom protective shell having a first bottom receiving groove, wherein the outer surface of the bottom plate of the bottom protective shell is connected to the outer surface of the bottom plate of the top protective shell;

[0009] A bottom support, having a second bottom receiving groove, the opening direction of the second bottom receiving groove is opposite to the opening direction of the first bottom receiving groove, and a connecting column is fixedly connected to the outer surface of the bottom plate of the bottom support;

[0010] A top limiting structure is provided between the top pressure cover and the top protective shell to limit the relative position between the two;

[0011] The bottom limiting structure is arranged between the bottom support and the bottom protective shell to limit the relative position between the two.

[0012] Preferably, the top limiting structure comprises: at least two top screws arranged at intervals; both ends of the top screws are provided with external threads, and both are matched with top nuts for threaded connection, one of the top nuts is fixed to the top gland, and the other top nut is fixed to the top protective shell;

[0013] And / or, the bottom limiting structure includes: at least two bottom screws arranged at intervals; both ends of the bottom screw are provided with external threads, and both are matched with bottom nuts in threaded connection, one of the bottom nuts is fixed to the bottom support, and the other bottom nut is fixed to the bottom protective shell.

[0014] Preferably, the bottom support is welded to the connecting column;

[0015] And / or, the external threads at both ends of the top screw have opposite rotation directions;

[0016] And / or, the top nut is welded to the top gland and the top protective shell respectively;

[0017] And / or, the external threads at both ends of the bottom screw have opposite rotation directions;

[0018] And / or, the bottom nut is welded to the bottom support and the bottom protective shell respectively.

[0019] Preferably, a first top cushion block is fixedly provided on the inner side wall of the top gland;

[0020] And / or, a second top cushion block is fixedly provided on the inner side wall of the top protective shell;

[0021] And / or, a first bottom pad is fixedly provided on the inner side wall of the bottom protective shell;

[0022] And / or, a second bottom pad is fixedly provided on the inner side wall of the bottom support.

[0023] Preferably, the first top spacer has a plurality of members;

[0024] and / or, the second top spacer has a plurality of members;

[0025] and / or, the first bottom spacer has a plurality of members;

[0026] And / or, there are a plurality of second bottom spacers.

[0027] Preferably, a rotation limiting structure is provided at the connection between the top protective shell and the bottom protective shell, and the rotation limiting structure is configured to enable the top protective shell and the bottom protective shell to rotate relative to each other and to position themselves.

[0028] Preferably, the rotation limiting structure includes:

[0029] A bottom slide groove is arranged on and penetrates the bottom plate of the bottom protective shell, and the bottom slide groove has an arc structure;

[0030] A top sliding column is fixedly arranged outside the bottom plate of the top protective shell, the top sliding column passes through and is slidably connected to the bottom sliding groove, and the portion of the top sliding column extending out of the bottom sliding groove has an external thread;

[0031] The first pressing cap is threadedly connected to the external thread of the top sliding column to limit the relative position of the top sliding column and the bottom sliding groove.

[0032] Preferably, there are a plurality of top sliding columns, and there are a plurality of bottom sliding grooves and first pressure caps, which respectively correspond to the top sliding columns.

[0033] Preferably, the rotation limiting structure includes:

[0034] A top slide groove is arranged on and penetrates the bottom plate of the top protective shell, and the top slide groove has an arc structure;

[0035] A bottom slide post is fixedly arranged outside the bottom plate of the bottom protective shell, the bottom slide post passes through and is slidably connected to the top slide slot, and the portion of the bottom slide post extending out of the top slide slot has an external thread;

[0036] The second pressing cap is connected to the bottom sliding column through threads to limit the positions of the bottom sliding column and the top sliding groove.

[0037] Preferably, there are a plurality of bottom slide columns, and there are a plurality of top slide grooves and second pressure caps, which respectively correspond to the bottom slide columns.

[0038] The beneficial effects of the protective tooling provided by the utility model are as follows: when using the protective tooling provided by the utility model, the first multi-unit guide blade to be prepared with a thermal barrier coating is placed between the first top accommodating groove and the second top accommodating groove, and the position of the top pressure cover and the top protective shell is limited by the top limiting structure to fix the first multi-unit guide blade, and the second multi-unit guide blade to be prepared with a thermal barrier coating is placed between the first bottom accommodating groove and the second bottom accommodating groove, and the position of the bottom support and the bottom protective shell is limited by the bottom limiting structure to fix the second multi-unit guide blade, and after the outer surface of the bottom plate of the bottom protective shell is connected to the outer surface of the bottom plate of the top protective shell, the connecting column fixed to the bottom support is connected to the horizontal rotating shaft of the thermal barrier coating preparation equipment, so that the thermal barrier coatings of two multi-unit guide blades can be prepared at the same time, thereby improving efficiency and saving preparation costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0040] Figure 1 A schematic structural diagram of the protective tooling provided in an embodiment of the utility model.

[0041] Figure 2 An overall schematic diagram of the rotation limit of the protective tooling provided in an embodiment of the utility model.

[0042] Figure 3 A schematic diagram of the rotation limiting structure of the protective tooling provided in an embodiment of the utility model.

[0043] Figure 4 A three-dimensional exploded schematic diagram of the protective tooling provided in an embodiment of the utility model.

[0044] Description of reference numerals:

[0045] 1-top pressure cover; 2-first top pad; 3-top nut; 4-top screw; 5-top protective shell; 6-second top pad; 7-bottom protective shell; 8-first bottom pad; 9-bottom nut; 10-bottom screw; 11-bottom support; 12-second bottom pad; 13-connecting column; 14-rotation limiting structure; 141-bottom slide groove; 142-top slide column; 143-first pressure cap. DETAILED DESCRIPTION

[0046] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0047] The present invention will be further described in detail below through specific implementation examples in conjunction with the accompanying drawings.

[0048] The utility model embodiment provides a protective tooling, such as Figure 1 and Figure 4 As shown, the protective tooling includes: a top pressure cover 1, a top protective shell 5, a bottom protective shell 7, a bottom support 11, a top limiting structure and a bottom limiting structure; wherein, the top pressure cover 1 has a first top receiving groove; the top protective shell 5 has a second top receiving groove, and the opening direction of the second top receiving groove is opposite to the opening direction of the first top receiving groove; the bottom protective shell 7 has a first bottom receiving groove, and the outer surface of the bottom plate of the bottom protective shell is connected to the outer surface of the bottom plate of the top protective shell; the bottom support 11 has a second bottom receiving groove, and the opening direction of the second bottom receiving groove is opposite to the opening direction of the first bottom receiving groove, and the outer surface of the bottom plate of the bottom support 11 is fixedly connected with a connecting column 13; the top limiting structure is arranged between the top pressure cover 1 and the top protective shell 5 to define the relative position between the two; the bottom limiting structure is arranged between the bottom support 11 and the bottom protective shell 7 to define the relative position between the two.

[0049] When using the protective tooling provided by the embodiment of the utility model, the first multi-unit guide blade to be prepared with a thermal barrier coating is placed between the first top accommodating groove and the second top accommodating groove, and the position of the top pressure cover and the top protective shell is limited by the top limiting structure to fix the first multi-unit guide blade, and the second multi-unit guide blade to be prepared with a thermal barrier coating is placed between the first bottom accommodating groove and the second bottom accommodating groove, and the position of the bottom support and the bottom protective shell is limited by the bottom limiting structure to fix the second multi-unit guide blade, and after the outer surface of the bottom plate of the bottom protective shell is connected to the outer surface of the bottom plate of the top protective shell, the connecting column fixed to the bottom support is connected to the horizontal rotating shaft of the thermal barrier spraying equipment (such as EB-PVD equipment), and the thermal barrier coatings of the two multi-unit guide blades are prepared at the same time, thereby improving efficiency and saving preparation costs.

[0050] In the embodiment of the utility model, the top limiting structure includes: at least two top screws 4 arranged at intervals; both ends of the top screws 4 are provided with external threads, and both are matched with top nuts 3 threadedly connected, one of the top nuts 3 is fixed to the top pressure cover 1, and the other top nut 3 is fixed to the top protective shell 5. Specifically, the top limiting structure is two diagonally and obliquely arranged top screws 4 and top nuts 3 corresponding to the top screws 4, and the direction of the screw holes after the top nuts 3 are fixed to the top pressure cover 1 and the top protective shell 5 is the same as the inclination direction of the top screw 4.

[0051] In the embodiment of the utility model, the bottom limiting structure includes: at least two bottom screws 10 arranged at intervals; both ends of the bottom screw 10 are provided with external threads, and both are matched with bottom nuts 9 threadedly connected, one of the bottom nuts 9 is fixed to the bottom support 11, and the other bottom nut 9 is fixed to the bottom protective shell 7. Specifically, the bottom limiting structure is two diagonally and obliquely arranged bottom screws 10 and bottom nuts 9 corresponding to the bottom screw 10. The direction of the screw hole after the bottom nut 9 is fixed to the bottom protective shell 7 and the bottom support 11 is the same as the inclination direction of the bottom screw 10. The use of screw nuts as a limiting structure is convenient for adapting to the length of the multi-unit guide blades, the connection is stable, and the installation and disassembly are convenient.

[0052] In the embodiment of the utility model, the bottom support 11 is welded to the connecting column 13; the external threads at both ends of the top screw 4 have opposite rotation directions; the top nut 3 is respectively welded to the top pressure cover 1 and the top protective shell 5; the external threads at both ends of the bottom screw 10 have opposite rotation directions; the bottom nut 9 is respectively welded to the bottom support 11 and the bottom protective shell 7; the external threads at both ends of the screw have opposite rotation directions, which makes it convenient for the two ends to be connected to the nut through threads at the same time when the screw rotates in the same direction, and can realize synchronous movement in the opposite direction or reverse direction.

[0053] In the embodiment of the utility model, the inner side wall of the top pressure cover 1 is fixedly provided with a first top pad 2; the inner side wall of the top protective shell 5 is fixedly provided with a second top pad 6; the inner side wall of the bottom protective shell 7 is fixedly provided with a first bottom pad 8; the inner side wall of the bottom support 11 is fixedly provided with a second bottom pad 12.

[0054] In the embodiment of the utility model, the first top pad 2 has multiple, specifically, any pair of relative inner walls of the top pressure cover 1 is welded with the first top pad 2; the second top pad 6 has multiple, specifically, any pair of relative inner walls of the top protective shell 5 is welded with the second top pad 6; the first bottom pad 8 has multiple, specifically, any pair of relative inner walls of the bottom protective shell 11 is welded with the first bottom pad 8; the second bottom pad 12 has multiple, specifically, any pair of relative inner walls of the bottom support 11 is welded with the second bottom pad 12, and the pads welded to the relative inner walls are used for positioning the edge plate of the multi-unit guide blade to achieve the same height between the upper surface of the edge plate and the edge of the tooling to avoid obstruction.

[0055] In the embodiment of the utility model, Figure 2 As shown, a rotation limiting structure 14 is provided at the connection between the top protective shell 5 and the bottom protective shell 7 , and the rotation limiting structure 14 is configured to enable the top protective shell 5 and the bottom protective shell 7 to rotate relative to each other and to be positioned.

[0056] The angle is adjusted by rotating the limiting structure 14 until the center of gravity of the protective tooling after the two multi-unit guide blades are installed is on the axis of the horizontal rotating shaft of the EB-PVD equipment, thereby limiting the relative angle between the top protective shell 5 and the bottom protective shell 7. This avoids the problem of insufficient support point reliability caused by the action of the anti-centrifugal force when preparing the thermal barrier coating on the surface of the multi-unit guide blades, thereby ensuring the uniformity of the thermal barrier coating prepared on the multi-unit guide blades.

[0057] In the embodiment of the utility model, Figure 3 As shown, the rotation limiting structure 14 includes: a bottom slide groove 141, a top slide column 142 and a first pressure cap 143; the bottom slide groove 141 is set and passes through the bottom plate of the bottom protective shell 7, and the bottom slide groove 141 has an arc structure; the top slide column 142 is fixed outside the bottom plate of the top protective shell 5, the top slide column 142 passes through and is slidably connected to the bottom slide groove 141, and the part of the top slide column 142 extending out of the bottom slide groove 141 has an external thread; the first pressure cap 143 is threadedly connected to the external thread of the top slide column 142 to limit the relative position of the top slide column 142 and the bottom slide groove 141, the slide column is slidably connected to the slide groove, which is convenient for rotation, and is rotated until the center of gravity of the protective tooling is on the axis of the horizontal rotation axis of the EB-PVD equipment, and the pressure cap is pressed to fix it.

[0058] In the embodiment of the utility model, Figure 3As shown, there are multiple top slide posts 142, multiple bottom slide grooves 141 and first pressure caps 143, which correspond to the top slide posts 142 respectively. Specifically, there are two top slide posts 142, the bottom slide grooves 141 correspond to the top slide posts 142, and are semicircular arc structures, and there are also two first pressure caps 143 corresponding to the top slide posts 142 for positioning. Multiple slide posts, slide grooves and pressure caps are provided to improve the stability of the connection.

[0059] In the embodiment of the utility model, in addition to the above-mentioned setting method, the rotation limiting structure 14 can also adopt other setting methods, specifically: a top slide groove, a bottom slide column and a second pressure cap are provided; the top slide groove is provided and passes through the bottom plate of the top protective shell 5, and the top slide groove has an arc structure; the bottom slide column is fixed outside the bottom plate of the bottom protective shell 7, the bottom slide column passes through and is slidably connected to the top slide groove, and the part of the bottom slide column extending out of the top slide groove has an external thread; the second pressure cap is connected to the bottom slide column by a thread to limit the position of the bottom slide column and the top slide groove.

[0060] In an embodiment of the utility model, there are multiple bottom sliding columns, multiple top sliding grooves and second pressure caps, which correspond to the bottom sliding columns respectively. Specifically, there are two bottom sliding columns, the top sliding grooves correspond to the bottom sliding columns, and are semicircular arc structures, and there are also two second pressure caps corresponding to the bottom sliding columns for positioning.

[0061] From the above analysis, it can be known that in the embodiment of the utility model, the first multi-unit guide blade to be prepared with a thermal barrier coating is placed between the first top receiving groove and the second top receiving groove, and the position of the first multi-unit guide blade is fixed by limiting the position through the diagonally arranged top screw 4, and the second multi-unit guide blade to be prepared with a thermal barrier coating is placed between the first bottom receiving groove and the second bottom receiving groove, and the position of the second multi-unit guide blade is fixed by limiting the position through the diagonally arranged bottom screw 10, and a rotation limiting structure 14 is provided between the top protective shell 5 and the bottom protective shell 7, and the top protective shell 5 and the bottom protective shell 7 are adjusted by sliding the slide column along the slide groove. The clamping angle of the protective shell 7 makes the center of gravity of the protective tooling be on the axis of the horizontal rotating shaft of the EB-PVD equipment, connecting the connecting column 13 fixedly connected to the bottom support 11 with the horizontal rotating shaft of the thermal barrier coating equipment, thereby reducing the anti-centrifugal force generated by eccentric rotation, avoiding the problem of insufficient reliability of the support point caused by the anti-centrifugal force when preparing the thermal barrier coating on the surface of the multi-unit guide blades, improving the vacuum sealing and reliability of the EB-PVD equipment, and ensuring that the thermal barrier coating is prepared uniformly and meets the quality requirements. The thermal barrier coating of two multi-unit guide blades is prepared at the same time, thereby improving efficiency and saving preparation costs.

[0062] In the embodiment of the utility model, the first top accommodating groove and the second bottom accommodating groove are used to accommodate the upper edge plate of the multi-unit guide blade, and the second top accommodating groove and the first bottom accommodating groove are used to accommodate the lower edge plate of the multi-unit guide blade. At the same time, different specifications of the top pressure cover 1, the top protective shell 5, the bottom protective shell 7, the bottom support 11 and the screw will be selected according to the size of the multi-unit guide blade, and the screw will be set and fixed along different inclination angles.

[0063] In the embodiment of the utility model, the side panels and the bottom panel of the top pressure cover 1, the top protective shell 5, the bottom protective shell 7 and the bottom support 11 are connected together by welding to form a receiving groove.

[0064] In the embodiment of the utility model, the structure of the cushion block needs to adapt to the bottom curvature of the edge plate of the multi-unit blade.

[0065] In an embodiment of the utility model, before making the protective tooling, the protective tooling model and the multi-unit guide blade model can be assembled on a computer through three-dimensional software, for example, solidworks software, and after adjusting the angle of the rotation limit structure, the center of gravity is found in the quality attribute function of the solidworks software until the center of gravity of the protective tooling after the model assembly is coaxial with the axis of the connecting column of the bottom support of the protective tooling; according to the angle data of the rotation limit structure on the software, after assembling the first multi-unit guide blade, the second multi-unit guide blade and the protective tooling, the connecting column is measured by a dial indicator, and the angle of the rotation limit structure is further adjusted by striking a balance, and when it is determined that the center of gravity of the protective tooling as a whole is on the axis of the horizontal rotation axis of the EB-PVD equipment, the pressure cap is tightened, the nut is welded, and the series screw is fixedly connected.

[0066] In the embodiment of the utility model, when the top limiting structure and the bottom limiting structure are provided, the screw rod and the nut may be assembled together first, and then the nut may be welded.

[0067] In an embodiment of the utility model, after about 40 minutes of deposition to prepare the thermal barrier coating on the first multi-unit guide blade and the second multi-unit guide blade connected to the protective tooling, the thermal barrier coating of the first multi-unit guide blade gained weight by 8.32g, and the thermal barrier coating of the second multi-unit guide blade gained weight by 8.22g, with a weight gain difference of 0.1g and a weight gain error of approximately 1.2%. When the thermal barrier coating of two multi-unit guide blades is prepared using the protective tooling, the average weight gain error of the thermal barrier coating of the two multi-unit guide blades is less than 4%. At the same time, it can be observed through a scanning electron microscope (SEM) that the thermal barrier coating prepared on the first multi-unit guide blade and the second multi-unit guide blade has a columnar crystal structure, and the columnar crystal structure is relatively uniform and dense.

[0068] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "horizontal", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0069] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the term "installation" 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 a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A protective workwear, It is characterized in that include: A top gland (1) having a first top receiving groove; A top protective shell (5) having a second top receiving groove, wherein the opening direction of the second top receiving groove is opposite to the opening direction of the first top receiving groove; A bottom protective shell (7) having a first bottom receiving groove, wherein the outer surface of the bottom plate of the bottom protective shell is connected to the outer surface of the bottom plate of the top protective shell; A bottom support (11) having a second bottom receiving groove, wherein the opening direction of the second bottom receiving groove is opposite to the opening direction of the first bottom receiving groove, and a connecting column (13) is fixedly connected to the outer surface of the bottom plate of the bottom support (11); A top limiting structure is arranged between the top pressure cover (1) and the top protective shell (5) to limit the relative position between the two; The bottom limiting structure is arranged between the bottom support (11) and the bottom protective shell (7) to limit the relative position between the two.

2. The protective tooling according to claim 1, It is characterized in that The top limiting structure comprises: at least two top screws (4) arranged at intervals; both ends of the top screws (4) are provided with external threads, and both are matched with top nuts (3) in threaded connection, wherein one of the top nuts (3) is fixedly arranged on the top gland (1), and the other top nut (3) is fixedly arranged on the top protective shell (5); And / or, the bottom limiting structure comprises: at least two bottom screws (10) arranged at intervals; both ends of the bottom screw (10) are provided with external threads, and both are matched with bottom nuts (9) in threaded connection, wherein one bottom nut (9) is fixed to the bottom support (11), and the other bottom nut (9) is fixed to the bottom protective shell (7).

3. The protective tooling according to claim 2, It is characterized in that The bottom support (11) is welded to the connecting column (13); And / or, the external threads at both ends of the top screw (4) have opposite rotation directions; And / or, the top nut (3) is welded to the top gland (1) and the top protective shell (5) respectively; And / or, the external threads at both ends of the bottom screw (10) have opposite rotation directions; And / or, the bottom nut (9) is welded to the bottom support (11) and the bottom protective shell (7) respectively.

4. The protective tooling according to claim 1, It is characterized in that A first top cushion block (2) is fixedly provided on the inner side wall of the top gland (1); And / or, a second top cushion block (6) is fixedly provided on the inner side wall of the top protective shell (5); And / or, a first bottom pad (8) is fixedly provided on the inner side wall of the bottom protective shell (7); And / or, a second bottom cushion block (12) is fixedly provided on the inner side wall of the bottom support (11).

5. The protective tooling according to claim 4, It is characterized in that The first top pad (2) has a plurality of parts; and / or, the second top spacer (6) has a plurality of members; and / or, the first bottom pad (8) has a plurality of members; And / or, the second bottom spacer (12) is in plurality.

6. The protective tooling according to any one of claims 1 to 5, It is characterized in that A rotation limiting structure (14) is provided at the connection between the top protective shell (5) and the bottom protective shell (7), and the rotation limiting structure (14) is configured to enable the top protective shell (5) and the bottom protective shell (7) to rotate relative to each other and to position themselves.

7. The protective tooling according to claim 6, It is characterized in that The rotation limiting structure (14) comprises: A bottom slide groove (141) is arranged on and penetrates the bottom plate of the bottom protective shell (7), and the bottom slide groove (141) has an arc-shaped structure; A top sliding column (142) is fixedly arranged outside the bottom plate of the top protective shell (5), the top sliding column (142) passes through and is slidably connected to the bottom sliding groove (141), and the portion of the top sliding column (142) extending out of the bottom sliding groove (141) has an external thread; The first pressing cap (143) is threadedly connected to the external thread of the top sliding column (142) to limit the relative position of the top sliding column (142) and the bottom sliding groove (141).

8. The protective tooling according to claim 7, It is characterized in that There are a plurality of top sliding columns (142), and there are a plurality of bottom sliding grooves (141) and first pressing caps (143), which respectively correspond to the top sliding columns (142).

9. The protective tooling according to claim 6, It is characterized in that The rotation limiting structure (14) comprises: A top slide groove is arranged on and penetrates the bottom plate of the top protective shell (5), and the top slide groove has an arc-shaped structure; A bottom sliding column is fixedly arranged outside the bottom plate of the bottom protective shell (7), the bottom sliding column passes through and is slidably connected to the top sliding groove, and the portion of the bottom sliding column extending out of the top sliding groove has an external thread; The second pressing cap is connected to the bottom sliding column through threads to limit the positions of the bottom sliding column and the top sliding groove.

10. The protective workwear according to claim 9, It is characterized in that There are a plurality of bottom sliding columns, and there are a plurality of top sliding grooves and second pressing caps, which respectively correspond to the bottom sliding columns.

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