Device and method for detecting dimensional precision of die steel

Abstract

The invention relates to the field of precision detection, and discloses die steel size precision detection equipment and method.The die steel size precision detection equipment comprises a precision detection frame.According to the die steel size precision detection equipment, through arrangement of multiple die steel detection mechanisms, if the size of a die steel body is too large, the die steel body is clamped by coloring rolling balls at the inner ends of two precision prompt cylinders; a user can judge that the size of the current die steel is too large, if the size of the die steel is normal, the two sides of the die steel penetrate through the two coloring rolling balls, rolling friction is generated between the two coloring rolling balls, and the coloring rolling balls rotate under the action of friction force, so that the side edges of the die steel are coated with ink filled in the precision prompting barrel, and the precision prompting effect is improved. A user can judge whether the precision of the die steel is correct or not, if the size of the die steel is small, the die steel does not rub with the coloring rolling ball, and the side edge of the die steel does not have black ink, in this way, real-time feedback is provided for the contact condition of the coloring rolling ball and the die steel in the detection process, and the user can immediately know the size state of the die steel.

Description

Technical Field

[0001] The present invention relates to the field of precision detection, and particularly to an equipment and method for detecting the dimensional accuracy of die steel. Background Art

[0002] Die steel is widely used in manufacturing cold stamping dies, hot stamping dies, die-casting dies, etc. due to its excellent properties. However, die steel has a relatively high hardness, which makes its processing difficult. During the processing of die steel, problems such as cutter breakage, slipping, and deviation are likely to occur during cutting, resulting in problems with the cutting dimensions and making it difficult to meet the processing accuracy requirements. Therefore, after cutting, existing die steel often needs to be further detected.

[0003] According to the Chinese authorized patent publication number: CN117804392A, an injection mold steel dimensional detection device is disclosed, which relates to the technical field of injection mold steel dimensional detection. It includes a base and legs fixed to the bottom of the base. A position adjustment mechanism is provided on the base, a rotation and displacement mechanism is provided on the position adjustment mechanism, the rotation and displacement mechanism is connected to a lifting mechanism, the lifting mechanism is connected to a detection mechanism, a spacing adjustment mechanism is provided on the base, the spacing adjustment mechanism is connected to two positioning mechanisms, a connecting rod mechanism is provided between the two positioning mechanisms, and a driving mechanism is provided between the base and the connecting rod mechanism. The present invention can adjust the position of the detection mechanism through the position adjustment mechanism, so as to detect different horizontal positions of the injection mold steel. The height of the detection mechanism can be adjusted through the lifting mechanism, so as to detect different height positions of the injection mold steel. The detection mechanism can be driven to rotate and displace through the rotation and displacement mechanism, so as to detect the injection mold steel on both sides. However, this device still has deficiencies. Most of the die steel dimensional accuracy detection devices are single-station detections and cannot detect multiple die steels simultaneously, resulting in low detection efficiency. For example, some devices need to place die steels on the detection table one by one for measurement, and it may take several minutes or even longer to detect one die steel, making it difficult to meet the needs of large-scale production. In addition, the presentation of the detection results of the detection device is not intuitive enough, and operators need to judge the dimensional accuracy of the die steel through complex numerical analysis or chart interpretation. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides an equipment and method for detecting the dimensional accuracy of die steel, which solves the problems of low detection efficiency and non-intuitive detection results of the current dimensional accuracy detection equipment.

[0005] To achieve the above object, the present invention is realized by the following technical solutions: A dimensional accuracy detection device for die steel, including a precision detection frame. The number of the precision detection frames is set to two. A concave detection table is fixedly connected between the two precision detection frames. A multi-die steel detection mechanism is arranged on the surface of the concave detection table. The multi-die steel detection mechanism includes an L-shaped support arm, a moving drive screw, a moving drive block, a rotating disk, a sliding plate, a scale plate, an indicating needle, a precision meter, a precision prompt cylinder, a coloring ball, and a liquid storage cylinder. The number of the L-shaped support arms is set to two. The two L-shaped support arms are respectively fixedly connected to the front and rear sides of the concave detection table. A moving drive screw is rotatably connected between the two L-shaped support arms. Two moving drive blocks are threadedly connected to the outer side of the moving drive screw. The upper ends of the two moving drive blocks are fixedly connected to the front and rear sides of the lower surface of the die steel placement table. The lower ends of the two moving drive blocks are slidably connected to the upper surface of the limit slide rail. The lower end of the limit slide rail is fixedly connected to the upper surface of the concave detection table. Two sliding plates are arranged at the rear side of the die steel placement table. The lower ends of the two sliding plates are respectively slidably connected to the upper surfaces of the two scale plates. The two scale plates are respectively fixedly connected to the middle two side grooves of the concave detection table. Precision meters are arranged on the upper surfaces of the two scale plates. Two precision prompt cylinders are respectively fixedly connected to the inner sides of the two sliding plates. Coloring balls are embedded in the inner sides of the two precision prompt cylinders. Liquid guide pipes are connected to the outer sides of the two sliding plates. The inner ends of the liquid guide pipes communicate with the precision prompt cylinders. The outer ends of the liquid guide pipes are connected to the liquid storage cylinder. An indicating needle is fixedly connected to the lower side of the inner end of the precision prompt cylinder.

[0006] Preferably, a die steel limit component is arranged on the upper surfaces of the two precision detection frames. The die steel limit component includes a fixed support, a connecting slide rail, a hydraulic rod, a limit pressing plate, a connecting rod, a lower pressing plate, and an outer slide rail. The left and right sides of the lower end of the fixed support are slidably connected to the upper surfaces of the two outer slide rails. The lower ends of the two outer slide rails are respectively fixedly connected to the left and right sides of the upper surfaces of the two precision detection frames.

[0007] Preferably, a hydraulic rod is arranged in the middle of the lower surface of the fixed support. The fixed end of the hydraulic rod is fixedly connected to the fixed support. The free end of the hydraulic rod is fixedly connected to the limit pressing plate. The left and right ends of the limit pressing plate are slidably connected to the inner sides of the two connecting slide rails. The two limit slide rails are respectively fixedly connected to the left and right sides inside the fixed support.

[0008] Preferably, connecting rods are respectively fixedly connected to the left and right sides of the lower surface of the limit pressing plate. The lower ends of the two connecting rods are respectively fixedly connected to the left and right sides of the upper surface of the lower pressing plate.

[0009] Preferably, positioning frames are respectively fixedly connected to the left and right sides of the front L-shaped support arm. Centering frames are respectively fixedly connected to the outer ends of the two positioning frames. A double-threaded screw is rotatably connected between the two centering frames.

[0010] Preferably, two opposite-moving brackets are threadedly connected to the left and right sides of the two double-threaded screws. The upper ends of the two opposite-moving brackets respectively penetrate through the two positioning frames. Inner sides of the upper ends of the two opposite-moving brackets are fixedly connected with centering clamping plates. Lower ends of the two opposite-moving brackets are respectively fixedly connected to the inner bottoms of the two centering frames. A motor is arranged on the outer side of the right opposite-moving bracket. An output end of the motor is in transmission connection with the double-threaded screw.

[0011] Preferably, a vertical baffle is fixedly connected to the front side of the upper surface of the die steel placing table. A plurality of die steel bodies are sequentially attached to the rear side of the vertical baffle.

[0012] Preferably, a rotating disk is rotatably connected to the front side of the front L-shaped arm. The rear side of the rotating disk is in transmission connection with the moving driving screw. A hand rocker is fixedly connected to the front side of the rotating disk.

[0013] Preferably, the precision prompt cylinder and the liquid storage cylinder are both filled with black ink.

[0014] A method for detecting the dimensional accuracy of die steel includes the following steps:

[0015] Step 1: The user adjusts the positions of the two sliding plates according to the correct dimensional accuracy of the die steel to ensure that the pointer below the inner end of the precision prompt cylinder aligns with the position of the precision scale on the scale plate.

[0016] Step 2: The die steel bodies are sequentially placed on the upper surface of the die steel placing table to prepare for dimensional accuracy detection.

[0017] Step 3: The motor drives the double-threaded screw to rotate. The opposite-direction thread structures on both sides of the double-threaded screw cause the opposite-moving brackets to move in opposite directions. The movement of the opposite-moving brackets causes the two centering clamping plates to simultaneously squeeze the two sides of the plurality of die steel bodies inward, realizing the centered placement of the plurality of die steel bodies.

[0018] Step 4: Operate the hand rocker. The rotating disk drives the moving driving screw to rotate through transmission connection. The rotation of the moving driving screw causes the two moving driving blocks to move along the screw, thereby driving the die steel placing table to move back and forth on the concave detection table. When the die steel placing table moves backward to the middle position of the concave detection table, the dimensional state is judged according to the contact situation between the die steel and the coloring ball.

[0019] Beneficial effects

[0020] The present invention provides a device and method for detecting the dimensional accuracy of die steel. Compared with the prior art, the following beneficial effects are achieved:

[0021] 1. In the present invention, through the provided multi-mold steel detection mechanism, before detecting the dimensional accuracy of the mold steel, the user needs to adjust the positions of the two sliding plates according to the accuracy of the correct dimensions of the mold steel, so that the pointer below the inner end of the precision prompt cylinder aligns with the position of the precision scale on the scale plate. Then, the mold steel body is sequentially placed on the upper surface of the mold steel placement table. The user operates the hand crank, and the rotating disk drives the moving drive screw to rotate through transmission connection, so that the two moving drive blocks move along the screw, and then drives the mold steel placement table to move back and forth on the concave detection table. When the mold steel placement table moves backward to the middle position of the concave detection table, if the size of the mold steel body is too large, it will be stuck by the coloring balls at the inner ends of the two precision prompt cylinders, and the user can judge that the current mold steel size is too large. If the mold steel size is normal, both sides of the mold steel pass through the two coloring balls and generate rolling friction with the two coloring balls. Since the coloring balls rotate under the action of friction, the ink filled in the precision prompt cylinder is coated on the side of the mold steel, and the user can judge whether the precision of the mold steel is correct in this way. If the mold steel size is too small, there is no friction with the coloring balls, and there is no black ink on the side of the mold steel. In this way, during the detection process, the contact situation between the coloring balls and the mold steel provides real-time feedback, and the user can immediately know the size state of the mold steel. This multi-mold steel detection mechanism not only improves the detection accuracy and efficiency, but also provides intuitive and reliable detection results, while ensuring the safety and convenience of operation;

[0022] 2. In the present invention, through the provided centering clamp, after placing multiple mold steel bodies on the surface of the mold steel placement table, the motor drives the double-threaded screw to rotate. Since the two sides of the double-threaded screw are provided with thread structures in opposite directions, after the double-threaded screw rotates, the opposing brackets on its two sides move in opposite directions, and then the two centering clamps simultaneously squeeze the two sides of multiple mold steel bodies inward, thereby realizing the centering of multiple mold steel bodies and avoiding the subsequent influence of the inclined placement of the mold steel body on the subsequent dimensional accuracy detection results. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a front-side three-dimensional structural schematic diagram of a dimensional accuracy detection device for a mold steel proposed by the present invention;

[0024] Figure 2 is a rear-side three-dimensional structural schematic diagram of a dimensional accuracy detection device for a mold steel proposed by the present invention;

[0025] Figure 3 is a front-side bottom view structural schematic diagram of a dimensional accuracy detection device for a mold steel proposed by the present invention;

[0026] Figure 4 is a partial structural schematic diagram of a multi-mold steel detection mechanism in a dimensional accuracy detection device for a mold steel proposed by the present invention;

[0027] Figure 5 Schematic diagram of the structure of the multi-mold steel detection mechanism in a dimensional accuracy detection device for a mold steel proposed by the present invention;

[0028] Figure 6 Schematic diagram of the structure of the mold steel limiting component in a dimensional accuracy detection device for a mold steel proposed by the present invention;

[0029] Figure 7 A dimensional accuracy detection device for a mold steel proposed by the present invention Figure 5 Enlarged view of A in it.

[0030] Legend description:

[0031] 1. Precision detection frame; 2. Multi-mold steel detection mechanism; 201. L-shaped support arm; 202. Moving drive screw; 203. Moving drive block; 204. Limiting slide rail; 205. Rotary disk; 206. Hand crank; 207. Slide plate; 208. Scale plate; 209. Indicator needle; 210. Precision meter; 211. Precision prompt cylinder; 212. Coloring ball; 213. Liquid guide pipe; 214. Liquid storage cylinder; 3. Mold steel limiting component; 301. Fixed support; 302. Connecting slide rail; 303. Hydraulic rod; 304. Limiting pressure plate; 305. Connecting rod; 306. Lower pressure plate; 307. Outer slide rail; 4. Concave detection table; 5. Mold steel placement table; 6. Vertical baffle; 7. Mold steel body; 8. Centering frame; 9. Double-threaded screw; 10. Opposite moving support; 11. Positioning frame; 12. Motor; 13. Centering clamping plate. Specific embodiments

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0033] Please refer to Figures 1-7 , the present invention provides two technical solutions, specifically including the following embodiments:

[0034] Embodiment 1:

[0035] A dimensional accuracy detection device for die steel, comprising a precision detection frame 1. The number of precision detection frames 1 is set to two. A concave detection table 4 is fixedly connected between the two precision detection frames 1. A multi-die steel detection mechanism 2 is arranged on the surface of the concave detection table 4. The multi-die steel detection mechanism 2 includes an L-shaped support arm 201, a moving drive screw 202, a moving drive block 203, a rotating disk 205, a sliding plate 207, a scale plate 208, an indicating needle 209, a precision meter 210, a precision prompt cylinder 211, a coloring ball 212 and a liquid storage cylinder 214. The number of L-shaped support arms 201 is set to two. The two L-shaped support arms 201 are respectively fixedly connected to the front and rear sides of the concave detection table 4. A moving drive screw 202 is rotatably connected between the two L-shaped support arms 201. Two moving drive blocks 203 are threadedly connected to the outer side of the moving drive screw 202. The upper ends of the two moving drive blocks 203 are fixedly connected to the front and rear sides of the lower surface of the die steel placement table 5. The lower ends of the two moving drive blocks 203 are slidably connected to the upper surface of the limit slide rail 204. The lower end of the limit slide rail 204 is fixedly connected to the upper surface of the concave detection table 4. Two sliding plates 207 are arranged at the rear side of the die steel placement table 5. The lower ends of the two sliding plates 207 are respectively slidably connected to the upper surfaces of the two scale plates 208. The two scale plates 208 are respectively fixedly connected to the middle two side grooves of the concave detection table 4. Precision meters 210 are arranged on the upper surfaces of the two scale plates 208. Two precision prompt cylinders 211 are respectively fixedly connected to the inner sides of the two sliding plates 207. Coloring balls are embedded in the inner sides of the two precision prompt cylinders 211. Liquid guide pipes 213 are connected to the outer sides of the two sliding plates 207. The inner ends of the liquid guide pipes 213 communicate with the precision prompt cylinders 211. The outer ends of the liquid guide pipes 213 are connected to a liquid storage cylinder 214. An indicating needle 209 is fixedly connected to the lower side of the inner end of the precision prompt cylinder 211. A rotating disk 205 is rotatably connected to the front side of the front L-shaped support arm 201. The rear side of the rotating disk 205 is in transmission connection with the moving drive screw 202. A hand rocker 206 is fixedly connected to the front side of the rotating disk 205. Black ink is filled in both the precision prompt cylinder 211 and the liquid storage cylinder 214.

[0036] During operation, before measuring the dimensional accuracy of the die steel, the user needs to adjust the positions of the two sliding plates 207 according to the accuracy of the correct dimensions of the die steel, so that the indicating needle 209 below the inner end of the precision prompt cylinder 211 aligns with the position of the precision table 210 on the scale plate 208. Then, the die steel body 7 is sequentially placed on the upper surface of the die steel placement table 5. The user operates the hand crank 206, and the rotating disk 205 drives the moving drive screw 202 to rotate through transmission connection, so that the two moving drive blocks 203 move along the screw, and then drive the die steel placement table 5 to move back and forth on the concave detection table 4. When the die steel placement table 5 moves backward to the middle position of the concave detection table 4, if the size of the die steel body 7 is too large, it will be stuck by the coloring balls at the inner ends of the two precision prompt cylinders 211, and the user can judge that the current die steel size is too large. If the die steel size is normal, both sides of the die steel pass through the two coloring balls and generate rolling friction with the two coloring balls. Since the coloring balls rotate under the action of friction, the ink filled in the precision prompt cylinder 211 is coated on the side of the die steel, and the user can judge whether the die steel precision is correct based on this. If the die steel size is too small, there is no friction with the coloring balls, and there is no black ink on the side of the die steel. In this way, during the detection process, the contact situation between the coloring balls and the die steel provides real-time feedback, and the user can immediately know the size state of the die steel. This multi-die steel detection mechanism 2 not only improves the detection accuracy and efficiency, but also provides intuitive and reliable detection results, while ensuring the safety and convenience of operation.

[0037] Embodiment 2:

[0038] On the basis of the first embodiment, a die steel limiting component 3 is arranged on the upper surface of the two precision detection frames 1. The die steel limiting component 3 includes a fixed bracket 301, a connecting slide rail 302, a hydraulic rod 303, a limiting pressure plate 304, a connecting rod 305, a lower pressure plate 306 and an outer slide rail 307. The left and right sides of the lower end of the fixed bracket 301 are slidably connected to the upper surfaces of the two outer slide rails 307. The lower ends of the two outer slide rails 307 are respectively fixedly connected to the left and right sides of the upper surfaces of the two precision detection frames 1. A hydraulic rod 303 is arranged in the middle of the lower surface of the fixed bracket 301. The fixed end of the hydraulic rod 303 is fixedly connected to the fixed bracket 301. The free end of the hydraulic rod 303 is fixedly connected to the limiting pressure plate 304. The left and right ends of the limiting pressure plate 304 are slidably connected to the inner sides of the two connecting slide rails 302. The two limiting slide rails 204 are respectively fixedly connected to the left and right sides inside the fixed bracket 301. The left and right sides of the lower surface of the limiting pressure plate 304 are both fixedly connected to a connecting rod 305. The lower ends of the two connecting rods 305 are respectively fixedly connected to the left and right sides of the upper surface of the lower pressure plate 306. The hydraulic rod 303 is used to drive the lower pressure plate 306 to press tightly on the upper surface of a plurality of die steel bodies 7, preventing the position of the die steel bodies 7 from shifting when the subsequent die steel placement table 5 moves. Positioning frames 11 are fixedly connected to both the left and right sides of the front L-shaped support arm 201. Centering frames 8 are fixedly connected to the outer ends of the two positioning frames 11. A double-threaded screw rod 9 is rotatably connected between the two centering frames 8. Two moving support brackets 10 are threadedly connected to the left and right sides of the two double-threaded screw rods 9. The upper ends of the two moving support brackets 10 respectively penetrate through the two positioning frames 11. Centering clamping plates 13 are fixedly connected to the inner sides of the upper ends of the two moving support brackets 10. The lower ends of the two moving support brackets 10 are respectively fixedly connected to the bottom ends inside the two centering frames 8. A motor 12 is arranged on the outer side of the right moving support bracket 10. The output end of the motor 12 is in transmission connection with the double-threaded screw rod 9. A vertical baffle 6 is fixedly connected to the front side of the upper surface of the die steel placement table 5. A plurality of die steel bodies 7 are sequentially attached to the rear side of the vertical baffle 6. After placing a plurality of die steel bodies 7 on the surface of the die steel placement table 5, the motor 12 is driven to rotate the double-threaded screw rod 9. Since the two sides of the double-threaded screw rod 9 are provided with thread structures in opposite directions, after the double-threaded screw rod 9 rotates, the two moving support brackets 10 on its two sides move in opposite directions, and then the two centering clamping plates 13 synchronously squeeze the two sides of a plurality of die steel bodies 7 inward, thereby realizing the centering of a plurality of die steel bodies 7 and avoiding affecting the subsequent dimensional accuracy detection result due to the inclined placement of the die steel bodies 7 in the subsequent process;

[0039] A method for detecting the dimensional accuracy of die steel includes the following steps:

[0040] Step 1: The user adjusts the positions of the two sliding plates 207 according to the correct dimensional accuracy of the die steel, and ensures that the indicating needle 209 below the inner end of the precision prompt cylinder 211 is aligned with the position of the precision table 210 on the scale plate 208;

[0041] Step 2: Place the mold steel body 7 on the upper surface of the mold steel placement table 5 in sequence, and prepare for dimensional accuracy detection;

[0042] Step 3: Drive the double-threaded screw rod 9 to rotate through the motor 12. The opposite-direction thread structures on both sides of the double-threaded screw rod 9 cause the moving support 10 to move in opposite directions. The movement of the moving support 10 causes the two centering clamping plates 13 to synchronously squeeze the two sides of multiple mold steel bodies 7 inward, realizing the centering placement of multiple mold steel bodies 7

[0043] Step 4: Operate the hand crank 206. The rotating disk 205 drives the moving drive screw rod 202 to rotate through transmission connection. The rotation of the moving drive screw rod 202 causes the two moving drive blocks 203 to move along the screw rod, thereby driving the mold steel placement table 5 to move back and forth on the concave detection table 4. When the mold steel placement table 5 moves backward to the middle position of the concave detection table 4, judge the dimensional state according to the contact situation between the mold steel and the coloring ball.

[0044] The above are only the preferred embodiments of the present application, and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the application shall be included in the protection scope of the present application.

Claims

1. A dimensional accuracy detection device for mold steel, comprising an accuracy detection frame (1), characterized in that: The number of the precision detection frames (1) is set to be two, and a concave detection platform (4) is fixedly connected between the two precision detection frames (1). The surface of the concave detection platform (4) is provided with a multi-die steel detection mechanism, and the multi-die steel detection mechanism (2) includes an L-shaped support arm (201), a movable drive screw (202), a movable drive block (203), a rotating disk (205), a sliding plate (207), a scale plate (208), an indicator needle (209), a precision meter (210), a precision prompt tube (211), a coloring The number of the L-shaped support arms (201) is set to two, and the two L-shaped support arms (201) are respectively fixedly connected to the front and rear sides of the concave detection platform (4). A movable driving screw (202) is rotatably connected between the two L-shaped support arms (201). The outer side of the movable driving screw (202) is threadedly connected to two movable driving blocks (203). The upper ends of the two movable driving blocks (203) are fixedly connected to the front and rear sides of the lower surface of the mold steel placement platform (5). The two movable driving blocks (203) are fixedly connected to the front and rear sides of the lower surface of the mold steel placement platform (5). The lower end of the dynamic driving block (203) is slidably connected to the upper surface of the limit slide rail (204), and the lower end of the limit slide rail (204) is fixedly connected to the upper surface of the concave detection platform (4). Two sliding plates (207) are arranged on the rear side of the mold steel placement platform (5). The lower ends of the two sliding plates (207) are respectively slidably connected to the upper surfaces of two scale plates (208). The two scale plates (208) are respectively fixedly connected to the grooves on both sides of the middle part of the concave detection platform (4). The upper surfaces of the two scale plates (208) are both provided with precision Table (210), two precision prompting tubes (211) are fixedly connected to the inner sides of the two sliding plates (207), and colored rolling balls are embedded in the inner sides of the two precision prompting tubes (211). The outer sides of the two sliding plates (207) are connected to liquid guide tubes (213), and the inner ends of the liquid guide tubes (213) are interconnected with the precision prompting tubes (211). The outer ends of the liquid guide tubes (213) are connected to liquid storage tubes (214), and the lower side of the inner ends of the precision prompting tubes (211) is fixedly connected to indicator needles (209).

2. The dimensional accuracy detection device for mold steel according to claim 1, characterized in that: A mold steel limiting assembly (3) is arranged on the upper surface of the two precision detection frames (1), and the mold steel limiting assembly (3) comprises a fixed bracket (301), a connecting slide rail (302), a hydraulic rod (303), a limiting pressure plate (304), a connecting rod (305), a lower pressure plate (306) and an outer slide rail (307). The left and right sides of the lower end of the fixed bracket (301) are slidably connected to the upper surface of the two outer slide rails (307), and the lower ends of the two outer slide rails (307) are respectively fixedly connected to the left and right sides of the upper surface of the two precision detection frames (1).

3. The dimensional accuracy detection device for mold steel according to claim 2 is characterized in that: A hydraulic rod (303) is arranged in the middle of the lower surface of the fixed bracket (301); the fixed end of the hydraulic rod (303) is fixedly connected to the fixed bracket (301); the free end of the hydraulic rod (303) is fixedly connected to a limiting pressure plate (304); the left and right ends of the limiting pressure plate (304) are slidably connected to the inner sides of the two connecting slide rails (302); the two limiting slide rails (204) are respectively fixedly connected to the left and right sides inside the fixed bracket (301).

4. The dimensional accuracy detection device for mold steel according to claim 2, characterized in that: The left and right sides of the lower surface of the limit pressure plate (304) are fixedly connected with connecting rods (305), and the lower ends of the two connecting rods (305) are respectively fixedly connected to the left and right sides of the upper surface of the lower pressure plate (306).

5. The dimensional accuracy detection device for mold steel according to claim 1, characterized in that: The left and right sides of the front L-shaped support arm (201) are fixedly connected to positioning frames (11), the outer ends of the two positioning frames (11) are fixedly connected to center frames (8), and the middle of the two center frames (8) is rotatably connected to a double-threaded screw (9).

6. The dimensional accuracy detection device for mold steel according to claim 5, characterized in that: The left and right sides of the two double-threaded screws (9) are threadedly connected to two opposing brackets (10); the upper ends of the two opposing brackets (10) respectively penetrate the two positioning frames (11); the inner sides of the upper ends of the two opposing brackets (10) are fixedly connected to a centering clamping plate (13); the lower ends of the two opposing brackets (10) are respectively fixedly connected to the inner bottom ends of the two centering frames (8); a motor (12) is arranged on the outer side of the right opposing bracket (10); and the output end of the motor (12) is drivingly connected to the double-threaded screw (9).

7. The dimensional accuracy detection device for mold steel according to claim 1, characterized in that: A vertical baffle (6) is fixedly connected to the front side of the upper surface of the mold steel placement platform (5), and a plurality of mold steel bodies (7) are sequentially fitted on the rear side of the vertical baffle (6).

8. The dimensional accuracy detection device for mold steel according to claim 1, characterized in that: The front side of the L-shaped support arm (201) is rotatably connected to a rotating disk (205), the rear side of the rotating disk (205) is transmission-connected to a movable driving screw (202), and the front side of the rotating disk (205) is fixedly connected to a hand crank (206).

9. The dimensional accuracy detection device for mold steel according to claim 1, characterized in that: The accuracy prompting cylinder (211) and the liquid storage cylinder (214) are both filled with black ink.

10. A method for detecting the dimensional accuracy of a mold steel, based on the dimensional accuracy detection device for mold steel according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: The user adjusts the positions of the two sliding plates (207) according to the correct dimensional accuracy of the mold steel, ensuring that the indicator needle (209) below the inner end of the accuracy prompt tube (211) is aligned with the position of the accuracy gauge (210) on the scale plate (208); Step 2: placing the mold steel body (7) on the upper surface of the mold steel placement table (5) in sequence, and preparing for dimensional accuracy testing; Step 3: The double-threaded screw (9) is driven to rotate by the motor (12). The thread structures on both sides of the double-threaded screw (9) in opposite directions make the shift bracket (10) move in opposite directions. The movement of the shift bracket (10) makes the two centering clamps (13) synchronously press the two sides of the multiple mold steel bodies (7) inward, so as to realize the centering of the multiple mold steel bodies (7). Step 4: operate the hand crank (206), the rotating disk (205) drives the movable driving screw (202) to rotate through the transmission connection, and the rotation of the movable driving screw (202) causes the two movable driving blocks (203) to move along the screw, thereby driving the mold steel placement table (5) to move back and forth on the concave detection table (4). When the mold steel placement table (5) moves back to the middle position of the concave detection table (4), the size state is judged according to the contact between the mold steel and the coloring ball.

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