A positioning protection type strength detection device for ductile iron casting production

Abstract

The present invention discloses a positioning and protective strength detection device for the production of ductile iron parts, which belongs to the technical field of strength detection of ductile iron parts, and includes a support seat, a position adjustment mechanism, a follower fixing mechanism and a protective mechanism, wherein the support seat is connected with a support frame. The follower fixing mechanism in the invention will gradually position the ductile iron parts in the process of approaching the ductile iron parts, which is conducive to the stable detection of the ductile iron parts by the press in the later stage. In addition, the follower fixing mechanism gradually approaches the ductile iron parts, so that ductile iron parts of different sizes can be stably positioned. Through the protective mechanism, when the press gradually detects the ductile iron parts, the rubber pad on the pad is gradually supported on the lower surface of the ductile iron parts, thereby preventing the ductile iron parts with quality defects from splashing due to the downward pressure of the press, so as to avoid the splashing ductile iron parts from hurting people.

Description

Technical Field

[0001] The invention relates to the technical field of strength detection of ductile iron castings, in particular to a positioning protection type strength detection device used for the production of ductile iron castings. Background Art

[0002] Ductile iron has been widely used in machinery manufacturing, automobile industry, construction and other fields due to its good mechanical properties, casting properties and wear resistance. However, the quality and performance of ductile iron parts are directly related to the reliability and safety of related products. Therefore, the strength test of ductile iron parts is very important.

[0003] The strength testing device for ductile iron casting production is a device that performs strength testing on ductile iron castings during production. By testing the strength of ductile iron castings, the quality of ductile iron castings can be judged, and thus their performance can be judged.

[0004] The existing strength detection device for ductile iron casting production still has the following technical problems when in use, such as:

[0005] 1. The existing strength detection device for ductile iron casting production is not convenient for positioning the ductile iron casting when in use, and thus it is not convenient to fix ductile iron castings of different sizes, which easily affects the subsequent strength detection of the ductile iron castings;

[0006] 2. The existing strength testing device for ductile iron castings is not provided with a protective structure when in use, which may cause ductile iron castings with quality defects to splash and injure people when being tested, which is not conducive to protecting the workers;

[0007] Therefore, a positioning protection type strength detection device for the production of ductile iron castings is needed to solve the above problems. Summary of the invention

[0008] The object of the present invention is to provide a positioning and protective strength detection device for the production of ductile iron parts, so as to solve the problem in the above background technology that the existing strength detection device for the production of ductile iron parts is not convenient for positioning the ductile iron parts and is not provided with a protective structure, which is not conducive to protecting the staff.

[0009] To achieve the above object, the present invention provides the following technical solutions:

[0010] A positioning and protective strength detection device for the production of ductile iron castings, comprising a support seat, a position adjustment mechanism, a follow-up fixing mechanism and a protective mechanism, wherein the support seat is connected to a support frame, and a press is installed on the lower surface of the upper part of the support frame, and an installation frame is also provided on the upper surface of the support seat, and the installation frame is connected to a C-shaped support member through a position adjustment mechanism, and the C-shaped support member is provided with a follow-up fixing mechanism, and one end of the protective mechanism is connected to the side of the telescopic part of the press, and the other end of the protective mechanism is connected to the position adjustment mechanism.

[0011] Preferably, the position adjustment mechanism includes a guide groove, a knob, a worm shaft, a worm gear disk, a limit groove, a limit slide groove and a support shaft, the guide groove is arranged above the worm gear disk, and the guide groove passes through the upper and lower surfaces of the worm gear disk, the worm gear disk bearing is connected to the interior of the mounting frame, and the mounting frame is provided with a limit groove passing through its upper surface and interior, the inner bottom surface of the mounting frame is provided with a limit slide groove, the support shaft passes through the corresponding limit groove and guide groove, and the lower end of the support shaft is slidably connected to the corresponding limit slide groove, the outer side of the worm gear disk is meshingly connected with a worm shaft, and one end bearing of the worm shaft is connected to the interior of the mounting frame, and the other end bearing of the worm shaft passes through the outside of the mounting frame and is coaxially fixedly connected to the knob.

[0012] Preferably, four guiding grooves are provided, and the four guiding grooves are distributed at equal angles with respect to the axis of the worm wheel disc, and the guiding grooves are arc-shaped.

[0013] Preferably, the limiting through groove and the corresponding limiting slide groove have the same structure and shape, and the two completely overlap, and there are 4 limiting through grooves and 4 limiting slide grooves, and the limiting through grooves and the limiting slide grooves correspond to the guide through grooves one by one.

[0014] Preferably, the follow-up fixing mechanism includes an upper piston tube, an air pipe, an upper piston rod, a fixing plate, a lateral piston tube, a lateral piston rod, a spring and a push plate. The top surface and the side surface of the C-shaped support are respectively provided with an upper piston tube and a lateral piston tube, and the upper piston tube and the lateral piston tube connected on the same C-shaped support are communicated through the air pipe. The upper end of the upper piston tube is seamlessly and slidably connected with the upper end of the upper piston rod, and the lower end of the upper piston rod is movably extended to the inner side of the opening end of the C-shaped support. The lower end of the upper piston rod is fixedly connected with the corresponding fixing plate, and one end of the corresponding lateral piston rod is seamlessly and slidably connected with the lateral piston tube, and the other end of the lateral piston rod is also movably extended to the inner side of the opening end of the C-shaped support. The other end of the lateral piston rod is fixedly connected with the corresponding push plate, and a spring movably nested in the outer side of the lateral piston rod is provided between the push plate and the inner side of the C-shaped support.

[0015] Preferably, the inner surface of the C-shaped support member and the lower surface of the fixed plate are both smooth planes, and the fixed plate and the push plate in the same C-shaped support member are arranged perpendicular to each other.

[0016] Preferably, the protection mechanism includes a pressure plate, a piston shaft, a connecting pipe, an X-shaped support plate, a connecting plate, an air chamber, a pad, a limiting ring, a vertical piston tube and a support rod, wherein one end of the support rod is movably extended into the four corners of the X-shaped support plate, and the other end of the support rod is fixedly connected to the corresponding support shaft, the upper surface of the X-shaped support plate is fixedly connected to the connecting plate, and the upper surface of the connecting plate is provided with an air chamber, the lower end of the pad is seamlessly slidably connected in the air chamber, the middle part of the connecting pipe passes through the X-shaped support plate and is connected with the air chamber, and the two ends of the connecting pipe are respectively connected to the corresponding vertical piston tube, the interior of each vertical piston tube is seamlessly slidably connected with the lower end of the piston shaft, and the upper end of the piston shaft movably passes through to the top of the vertical piston tube, each of the piston shaft is provided with two coaxial limiting rings, and a pressure plate is provided between the two limiting rings on the same piston shaft, one end of the pressure plate is movably nested in the outer side of the piston shaft, and the other end of the pressure plate is fixedly connected to the side of the telescopic part of the press.

[0017] Preferably, a rubber pad is provided on the upper surface of the pad for softly supporting the ductile iron casting.

[0018] Preferably, the diameter of the hole formed on one end of the pressure plate connected to the piston shaft is smaller than the outer diameter of the limiting ring.

[0019] Preferably, the three-way pipe of the connecting pipe is used to connect two vertical piston tubes and the gas chamber.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: the follow-up fixing mechanism on the positioning and protection type strength detection device for ductile iron casting production will gradually position the ductile iron casting in the process of approaching the ductile iron casting, which is conducive to the stable detection of the ductile iron casting by the press in the later stage. In addition, the follow-up fixing mechanism gradually approaches the ductile iron casting, so that ductile iron castings of different sizes can be stably positioned. Through the protection mechanism, when the press gradually detects the ductile iron casting, the rubber pad on the pad is gradually supported on the lower surface of the ductile iron casting, thereby preventing the ductile iron casting with quality defects from splashing due to the downward pressure of the press, so as to avoid the splashing ductile iron casting from injuring people:

[0021] 1. The worm wheel shaft rotates to drive the worm wheel disc to rotate, so that the support shafts move closer to or farther away from each other under the action of the guide groove, the limit groove and the limit slide groove, so that the C-shaped support parts can move closer to or farther away from each other, which is helpful for positioning ductile iron parts of different sizes;

[0022] 2. In the process of the C-shaped support members approaching each other, the ductile iron part will gradually squeeze the push plate, so that the lateral piston rod will gradually move into the lateral piston tube, so that the gas in the lateral piston tube can be transported to the upper piston tube through the air pipe to increase the air pressure in the upper piston tube. After the air pressure in the upper piston tube increases, it will squeeze the upper piston rod, so that the upper piston rod drives the fixed plate to gradually approach the upper surface of the ductile iron part. The ductile iron part can be positioned by squeezing the upper and lower surfaces of the ductile iron part by the fixed plate and the C-shaped support member, which is helpful for the subsequent press to detect the ductile iron part;

[0023] 3. When the press is running, it drives the pressure plate to move downward. When the pressure plate moves to contact the limit ring below, the pressure plate continues to move downward, which will drive the piston shaft to move downward synchronously, so that the lower end of the piston shaft moves toward the inside of the vertical piston tube, and the gas in the vertical piston tube is transported to the air chamber by the connecting pipe. The air pressure in the air chamber is increased, thereby squeezing the pad, causing the pad to move upward, so that it contacts the lower surface of the ductile iron part, and is used to support the lower surface of the ductile iron part. Because the upper surface of the pad is a rubber pad, it is elastic and can prevent the ductile iron parts with quality defects from splashing due to the downward pressure of the press, thereby avoiding injuries to the staff. After the ductile iron parts with quality defects crack, the press drives the pressure plate to move up. Only when the pressure plate moves up to contact the limit ring above, it will drive the piston shaft to move upward synchronously, thereby ensuring that the rubber pad fully absorbs the kinetic energy after the ductile iron part cracks. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0025] Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention;

[0026] Figure 3 For the present invention Figure 2 A schematic diagram of the enlarged structure of point A;

[0027] Figure 4 It is a partial cross-sectional structural schematic diagram of the present invention;

[0028] Figure 5 This is a bottom view of the structure of the connection between the mounting frame and the worm wheel disc of the present invention;

[0029] Figure 6 For the present invention Figure 5 A schematic diagram of the enlarged structure of point B in the middle;

[0030] Figure 7 This is a schematic diagram of the cross-sectional connection structure of a C-shaped support member of the present invention;

[0031] Figure 8 For the present invention Figure 7The schematic diagram of the enlarged structure of point C in the middle;

[0032] Fig. 9 It is a schematic diagram of the connection structure between the worm wheel and the support shaft of the present invention.

[0033] In the figure: 1. support seat; 2. support frame; 3. press machine; 4. pressure plate; 5. guide groove; 6. mounting frame; 7. knob; 8. piston shaft; 9. worm shaft; 10. worm wheel; 11. limit groove; 12. connecting pipe; 13. X-shaped support plate; 14. connecting plate; 15. air chamber; 16. pad; 17. limit ring; 18. vertical piston tube; 19. limit slide groove; 20. support shaft; 21. support rod; 22. C-shaped support member; 23. upper piston tube; 24. air pipe; 25. upper piston rod; 26. fixing plate; 27. lateral piston tube; 28. lateral piston rod; 29. ​​spring; 30. push plate. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] See also Figure 1-Figure 9 , the present invention provides the following technical solutions:

[0036] Embodiment 1:

[0037] In order to solve the problem that the strength detection device of ductile iron parts in the past is not convenient for positioning ductile iron parts, and thus is not convenient for fixing ductile iron parts of different sizes, which easily affects the subsequent strength detection of ductile iron parts, the following technical solutions are provided, specifically,

[0038] A positioning and protective strength detection device for the production of ductile iron castings, comprising a support seat 1, a position adjustment mechanism, a follow-up fixing mechanism and a protective mechanism, wherein a support frame 2 is connected to the support seat 1, and a press machine 3 is installed on the lower surface of the upper part of the support frame 2, and an installation frame 6 is also provided on the upper surface of the support seat 1, and the installation frame 6 is connected to a C-shaped support member 22 through a position adjustment mechanism, and the C-shaped support member 22 is provided with a follow-up fixing mechanism.

[0039] The position adjustment mechanism includes a guide groove 5, a knob 7, a worm shaft 9, a worm wheel disc 10, a limit groove 11, a limit slide groove 19 and a support shaft 20. The guide groove 5 is arranged above the worm wheel disc 10, and the guide groove 5 passes through the upper and lower surfaces of the worm wheel disc 10. The worm wheel disc 10 is connected to the inside of the mounting frame 6 by a bearing, and the mounting frame 6 is provided with a limit groove 11 passing through its upper surface and the inside. The inner bottom surface of the mounting frame 6 is provided with a limit slide groove 19. The support shaft 20 passes through the corresponding limit groove 11 and the guide groove 5, and the lower end of the support shaft 20 is slidably connected in the corresponding limit slide groove 19. The outer side of the worm wheel disc 10 is meshedly connected with the worm shaft 9, and one end of the worm shaft 9 is connected to the inside of the mounting frame 6 by a bearing, and the other end of the worm shaft 9 passes through the inner bottom surface of the mounting frame 6. The outside of the mounting frame 6 is coaxially fixedly connected with the knob 7. The worm shaft 9 is rotated by the knob 7 to rotate the worm wheel 10. The support shaft 20 can be moved along the limiting groove 11 by the rotation of the worm wheel 10, the limiting groove 11 and the limiting slide groove 19, and the driving of the support shaft 20 by the guide groove 5, so that the four support shafts 20 can be brought closer to or farther away from each other, which is helpful to achieve the purpose of positioning ductile iron parts of different sizes. There are four guide grooves 5, and the four guide grooves 5 are distributed at equal angles with respect to the axis of the worm wheel 10, and the guide grooves 5 are arc-shaped, so it is easy to use the arc-shaped guide grooves 5 to make the support shaft 20 move smoothly when the worm wheel 10 rotates. The limiting grooves 11 and the corresponding limiting grooves The structure and shape of the positioning slide 19 are the same, and the two completely overlap. There are 4 limit grooves 11 and limit slides 19, and the limit grooves 11 and limit slides 19 correspond to the guide grooves 5 one by one. The follow-up fixing mechanism includes an upper piston tube 23, an air pipe 24, an upper piston rod 25, a fixing plate 26, a lateral piston tube 27, a lateral piston rod 28, a spring 29 and a push plate 30. The top and side surfaces of the C-shaped support 22 are respectively provided with an upper piston tube 23 and a lateral piston tube 27, and the upper piston tube 23 and the lateral piston tube 27 connected to the same C-shaped support 22 are connected through the air pipe 24. The upper end of the corresponding upper piston rod 25 is seamlessly slidably connected in the upper piston tube 23, and the lower end of the upper piston rod 25 is movably extended to On the inner side of the open end of the C-shaped support 22, the lower end of the upper piston rod 25 is fixedly connected with the corresponding fixed plate 26, and one end of the corresponding lateral piston rod 28 is seamlessly slidably connected in the lateral piston tube 27, and the other end of the lateral piston rod 28 is also movably extended into the inner side of the open end of the C-shaped support 22, and the other end of the lateral piston rod 28 is fixedly connected with the corresponding push plate 30, and a spring 29 movably nested in the outer side of the lateral piston rod 28 is provided between the push plate 30 and the inner side of the C-shaped support 22. After the four support shafts 20 approach each other to make the ductile iron part extend into the C-shaped support 22, the four support shafts 20 continue to approach each other to make the ductile iron part squeeze the push plate 30. After being squeezed, the push plate 30 will make the lateral piston rod 28 move into the lateral piston tube 27.As a result, the gas in the lateral piston tube 27 is transported to the upper piston tube 23 by the air pipe 24, thereby increasing the air pressure in the upper piston tube 23, so that the upper piston rod 25 is squeezed, so that the fixing plate 26 moves downward with the upper piston rod 25, and then the upper and lower surfaces of the ductile iron part can be squeezed by the lower surface of the fixing plate 26 and the inner surface of the C-shaped support 22 respectively, so as to fix the ductile iron part and position the ductile iron part. The inner surface of the C-shaped support 22 and the lower surface of the fixing plate 26 are both smooth planes, and the fixing plate 26 and the push plate 30 in the same C-shaped support 22 are arranged perpendicular to each other. When the inner surface of the C-shaped support 22 and the lower surface of the fixing plate 26 are both smooth planes, after the detection is completed, the ductile iron part can be easily loosened by the reverse rotation of the worm shaft 9.

[0040] Embodiment 2:

[0041] In order to solve the problem that the strength detection device of ductile iron parts in the past was not provided with a protective structure when in use, which easily caused the ductile iron parts with quality defects to splash and injure people when being detected, thus being not conducive to protecting the staff, the following technical solution is provided, specifically, one end of the protective mechanism is connected to the side of the telescopic part of the press 3, and the other end of the protective mechanism is connected to the position adjustment mechanism.

[0042] The protection mechanism includes a pressure plate 4, a piston shaft 8, a connecting pipe 12, an X-shaped support plate 13, a connecting plate 14, an air chamber 15, a pad 16, a limiting ring 17, a vertical piston tube 18 and a support rod 21. The four corners of the X-shaped support plate 13 are movably extended with one end of the support rod 21, and the other end of the support rod 21 is fixedly connected to the corresponding support shaft 20. The upper surface of the X-shaped support plate 13 is fixedly connected with the connecting plate 14, and the upper surface of the connecting plate 14 is provided with an air chamber 15, and the lower end of the pad 16 is seamlessly slidably connected in the air chamber 15. The middle part passes through the X-shaped support plate 13 and is connected to the gas chamber 15, and the two ends of the connecting pipe 12 are connected to the corresponding vertical piston tubes 18 respectively. The lower end of the piston shaft 8 is seamlessly slidably connected inside each vertical piston tube 18, and the upper end of the piston shaft 8 is movably connected to the top of the vertical piston tube 18. Two coaxial limiting rings 17 are arranged on each piston shaft 8, and a pressure plate 4 is arranged between the two limiting rings 17 on the same piston shaft 8. One end of the pressure plate 4 is movably nested on the outside of the piston shaft 8, and the other end of the pressure plate 4 is fixedly connected to On the side of the telescopic part of the press machine 3, when the press machine 3 drives the pressing plate 4 to move downward for a certain distance, the pressing plate 4 contacts the limiting ring 17 below. At this time, the pressing plate 4 continues to move, driving the piston shaft 8 to move downward synchronously, so that the piston shaft 8 squeezes the gas in the vertical piston tube 18, and the gas in the vertical piston tube 18 enters the gas chamber 15 through the connecting pipe 12, so that the pad 16 can gradually move upward to support the lower surface of the ductile iron casting. By supporting the lower surface of the ductile iron casting, it is avoided that the ductile iron casting with quality defects is damaged during the inspection process due to the lower The ductile iron parts are splashed due to the lack of support, so that the staff can be protected. When the pressure plate 4 moves up, it can drive the piston shaft 8 to move up synchronously only after it moves to contact with the limit ring 17 above, so that the pad 16 can support the ductile iron parts for a long time. The upper surface of the pad 16 is provided with a rubber pad for soft support of the ductile iron parts. The diameter of the hole groove opened at one end of the pressure plate 4 connected to the piston shaft 8 is smaller than the outer diameter of the limit ring 17. The three-way pipe of the connecting pipe 12 is used to connect the two vertical piston tubes 18 and the gas chamber 15.

[0043] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0044] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A positioning and protection type strength detection device for the production of ductile iron castings, comprising a support seat (1), a position adjustment mechanism, a follow-up fixing mechanism and a protection mechanism, characterized in that: The support seat (1) is connected to a support frame (2), and a press (3) is installed on the lower surface of the upper part of the support frame (2). The upper surface of the support seat (1) is also provided with a mounting frame (6), and the mounting frame (6) is connected to the C-shaped support member (22) through a position adjustment mechanism. The C-shaped support member (22) is provided with a follower fixing mechanism. The telescopic part of the press (3) is connected to one end of a protective mechanism on the side, and the other end of the protective mechanism is connected to the position adjustment mechanism. The protective mechanism comprises a pressing plate (4), a piston shaft (8), a connecting pipe (12), an X-shaped support plate (13), a connecting plate (14), an air chamber (15), a pad (16), a limiting ring (17), a vertical piston tube (18) and a support rod (21). One end of the support rod (21) is movably extended into the four corners of the X-shaped support plate (13), and the other end of the support rod (21) is fixedly connected to the corresponding support shaft (20). The upper surface of the support plate (13) is fixedly connected to a connecting plate (14), and the upper surface of the connecting plate (14) is provided with an air chamber (15), and the lower end of the pad (16) is seamlessly slidably connected in the air chamber (15), and the middle part of the connecting pipe (12) passes through the X-shaped support plate (13) and is connected to the air chamber (15), and the two ends of the connecting pipe (12) are respectively connected to the corresponding vertical piston tube (18), and the interior of each vertical piston tube (18) is free of The lower end of the piston shaft (8) is slidably connected to the slot, and the upper end of the piston shaft (8) is movably extended to the top of the vertical piston tube (18), and each of the piston shafts (8) is provided with two coaxial limit rings (17), and a pressure plate (4) is provided between the two limit rings (17) on the same piston shaft (8), one end of the pressure plate (4) is movably embedded in the outer side of the piston shaft (8), and the other end of the pressure plate (4) is fixedly connected to the side of the telescopic part of the press (3).

2. A positioning protection type strength detection device for ductile iron casting production according to claim 1, characterized in that: The position adjustment mechanism comprises a guide groove (5), a knob (7), a worm shaft (9), a worm wheel disc (10), a limit groove (11), a limit slide groove (19) and a support shaft (20), wherein the guide groove (5) is arranged above the worm wheel disc (10), and the guide groove (5) passes through the upper and lower surfaces of the worm wheel disc (10), the bearing of the worm wheel disc (10) is connected to the inside of the mounting frame (6), and the mounting frame (6) is provided with a limit groove (11) passing through the upper surface and the inside thereof, and the mounting frame (6) is provided with a limit groove (11) passing through the upper surface and the inside thereof, and the mounting frame (20 ... The inner bottom surface of the frame (6) is provided with a limit slide groove (19), the support shaft (20) passes through the corresponding limit slot (11) and the guide slot (5), and the lower end of the support shaft (20) is slidably connected to the corresponding limit slide groove (19), the outer side of the worm wheel (10) is meshingly connected with a worm shaft (9), and one end bearing of the worm shaft (9) is connected to the inside of the mounting frame (6), and the other end bearing of the worm shaft (9) passes through the outside of the mounting frame (6) and is coaxially fixedly connected to the knob (7).

3. A positioning protection type strength detection device for ductile iron casting production according to claim 2, characterized in that: Four guide grooves (5) are provided, and the four guide grooves (5) are distributed at equal angles with respect to the axis of the worm wheel (10), and the guide grooves (5) are arc-shaped.

4. A positioning protection type strength detection device for ductile iron casting production according to claim 3, characterized in that: The limiting through groove (11) and the corresponding limiting sliding groove (19) have the same structure and shape, and the two completely overlap. There are four limiting through grooves (11) and four limiting sliding grooves (19), and the limiting through grooves (11) and the limiting sliding grooves (19) correspond to the guide through grooves (5) one by one.

5. A positioning protection type strength detection device for ductile iron casting production according to claim 4, characterized in that: The follower type fixing mechanism comprises an upper piston tube (23), an air pipe (24), an upper piston rod (25), a fixing plate (26), a lateral piston tube (27), a lateral piston rod (28), a spring (29) and a push plate (30); the upper piston tube (23) and the lateral piston tube (27) are respectively arranged on the top surface and the side surface of the C-shaped support member (22); the upper piston tube (23) and the lateral piston tube (27) connected to the same C-shaped support member (22) are connected through the air pipe (24); the upper end of the corresponding upper piston rod (25) is seamlessly slidably connected in the upper piston tube (23); and the upper movable The lower end of the plug rod (25) is movably extended into the inner side of the opening end of the C-shaped support member (22); the lower end of the upper piston rod (25) is fixedly connected to a corresponding fixing plate (26); one end of a corresponding lateral piston rod (28) is seamlessly slidably connected in the lateral piston tube (27); the other end of the lateral piston rod (28) is also movably extended into the inner side of the opening end of the C-shaped support member (22); the other end of the lateral piston rod (28) is fixedly connected to a corresponding push plate (30); and a spring (29) movably nested in the outer side of the lateral piston rod (28) is provided between the push plate (30) and the inner side of the C-shaped support member (22).

6. A positioning protection type strength detection device for ductile iron casting production according to claim 5, characterized in that: The inner surface of the C-shaped support member (22) and the lower surface of the fixed plate (26) are both smooth planes, and the fixed plate (26) and the push plate (30) in the same C-shaped support member (22) are arranged perpendicular to each other.

7. A positioning protection type strength detection device for ductile iron casting production according to claim 6, characterized in that: The upper surface of the pad (16) is provided with a rubber pad for softly supporting the ductile iron casting.

8. A positioning protection type strength detection device for ductile iron casting production according to claim 7, characterized in that: The diameter of the hole groove formed at one end of the pressure plate (4) connected to the piston shaft (8) is smaller than the outer diameter of the limiting ring (17).

9. A positioning protection type strength detection device for ductile iron casting production according to claim 8, characterized in that: The three-way pipe of the connecting pipe (12) is used to connect the two vertical piston tubes (18) and the gas chamber (15).

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