Apparatus for testing drop impact of seat

Abstract

A sheet drop impact test device is disclosed. The disclosed sheet drop impact test device comprises: a base; a cage on which a test sheet is detachably installed; a lifting unit that moves the cage in an upward direction separated from the base and in a downward direction toward the base; a locking unit that connects the lifting unit and the cage so that the lifting unit and the cage move together, and selectively releases the connection between the lifting unit and the cage so that the cage falls from above the base toward the base; and an impact measuring sensor installed on at least one of the base, the cage, and the test sheet, which measures the impact when the falling cage stops due to a collision.

Description

Technology Field

[0001] The present invention relates to a sheet drop impact test device that measures the impact applied to the sheet and the cushioning capacity of the sheet by dropping the sheet. Background Technology

[0003] Special mission vehicles, such as military transport vehicles, may be equipped with blast-proof sheets to mitigate the impact of explosions caused by explosives, such as landmines. To test the blast-proof and cushioning performance of these sheets, a test method can be used in which explosives are placed beneath the sheet and detonated to simulate actual usage conditions. However, this method carries a high risk of accidents and can be costly due to the use of explosives.

[0004] Meanwhile, the impact applied to the explosion-proof sheet due to the explosion of explosives can correspond to the impact applied to the sheet when it falls and collides with the floor. In other words, a test measuring the impact force applied to the explosion-proof sheet when it is dropped from a certain height and the cushioning capacity provided by the sheet can replace a test that measures the impact force applied to the sheet and the cushioning capacity provided by the sheet by detonating actual explosives.

[0005] Therefore, a sheet drop impact test device is required to measure the buffering capacity during an explosive explosion or drop by dropping a sheet, such as an explosion-proof sheet.

[0006] The background technology for the present invention is disclosed in Korean Registered Patent Publication No. 10-2410226 (Registered June 14, 2022; Title of Invention: Drop Impact Test Device for Evaluating Fall Protection Pads). The problem to be solved

[0008] The present invention aims to improve upon the aforementioned problems by providing a sheet drop impact test device that installs a sheet inside a cage and drops the cage to test the drop impact of the sheet. means of solving the problem

[0010] A sheet drop impact test device according to one embodiment of the present invention comprises: a base; a cage on which a test sheet is detachably installed; a lifting unit that moves the cage in an upward direction spaced apart from the base and in a downward direction toward the base; a locking unit that connects the lifting unit and the cage so that the lifting unit and the cage move together, and selectively releases the connection between the lifting unit and the cage so that the cage falls from above the base toward the base; and an impact measuring sensor installed on at least one of the base, the cage, and the test sheet, and measuring an impact when the falling cage stops due to a collision.

[0011] The above impact measuring sensor may include a base-mounted load cell installed on the base that collides with the falling cage.

[0012] The above cage may include a cage frame in which the test sheet is installed, and a collision plate detachably installed on the cage frame and which directly collides with the base-installed load cell when the cage falls.

[0013] The above impact measuring sensor may include a sheet-installed load cell installed on the test sheet.

[0014] The above impact measuring sensor may include a cage-installed acceleration sensor installed in the cage and a sheet-installed acceleration sensor installed in the test sheet.

[0015] The above sheet drop impact test device may further include a speed sensor installed in the cage to measure the drop speed of the cage.

[0016] The above sheet drop impact test device may further include a displacement sensor that measures the height to which the cage is raised to drop.

[0017] The locking unit may include a trigger capable of sliding horizontally relative to the cage, and a trigger actuator that provides power to move the trigger in the direction in which the lifting unit and the cage are connected and in the opposite direction.

[0018] The above sheet drop impact test device may further include a drop prevention unit that prevents the unintended drop of the cage caused by malfunction or damage to the locking unit.

[0019] The above sheet drop impact test device may further include a lifting guide that guides the cage so as not to tilt when it is lifted and a vertical column that supports the drop prevention unit.

[0020] The lifting unit may include an intermediate member detachably connected to the locking unit, and a crane that suspends and supports the intermediate member and lifts the intermediate member.

[0021] A weight can be supported on the above test sheet. Effects of the invention

[0023] According to the present invention, the impact resistance performance of a sheet, such as an explosion-proof sheet, can be easily assessed through a test in which explosives are dropped without detonating, and reliable test results can be obtained. Furthermore, sheet drop impact tests can be conducted on various types of sheets by varying the weight of the counterweight and the drop height without damaging the sheet drop impact test device. Consequently, the cost of the sheet drop impact test is reduced, and the manufacturing cost of the sheet can also be reduced.

[0024] According to the present invention, since the cushioning performance and impact resistance performance of the sheet can be tested in a simple manner in advance before going to an overseas testing institution to test whether they meet international standards, testing costs can be reduced and the manufacturing cost of the sheet can also be reduced. Brief explanation of the drawing

[0026] FIG. 1 is a perspective view of a sheet drop impact test device according to one embodiment of the present invention. Figure 2 is an enlarged view of part II of Figure 1. FIG. 3 is a perspective view showing the cage of FIG. 1 with the front door open. Fig. 4 is a front view showing a sheet installed in the cage of Fig. 3. FIG. 5 is a front view illustrating a part of a sheet drop impact test device, showing the lifting unit and the cage connected by a locking unit. FIG. 6 is a front view showing a part of a sheet drop impact test device, showing the connection between the lifting unit and the cage released. FIG. 7 is a front view of a sheet drop impact test device, illustrating the appearance of a cage falling and colliding with a base. FIG. 8 is an enlarged perspective view of the fall prevention unit of FIG. 5 and FIG. 7. Specific details for implementing the invention

[0027] Hereinafter, a sheet drop impact test apparatus according to an embodiment of the present invention will be described in detail with reference to the attached drawings. The terminology used in this specification is used to appropriately express preferred embodiments of the present invention, and may vary depending on the intent of the user or operator or the conventions of the field to which the present invention belongs. Therefore, the definitions of these terms should be based on the content throughout this specification.

[0029] FIG. 1 is a perspective view of a sheet drop impact test device according to an embodiment of the present invention, FIG. 2 is an enlarged view of part II of FIG. 1, FIG. 3 is a perspective view showing the cage of FIG. 1 with the front door open, FIG. 4 is a front view showing the sheet installed in the cage of FIG. 3, FIG. 5 is a front view showing a part of the sheet drop impact test device showing the lifting unit and the cage connected by a locking unit, FIG. 6 is a front view showing a part of the sheet drop impact test device showing the connection between the lifting unit and the cage released, FIG. 7 is a front view of the sheet drop impact test device showing the cage falling and colliding with the base, FIG. 8 is an enlarged perspective view of the drop prevention unit of FIG. 5 and FIG. 7.

[0030] Referring to FIGS. 1 to 8, a sheet drop impact test device (100) according to one embodiment of the present invention includes a base (101), a cage (160), a lifting unit (120), a locking unit (140), and impact measuring sensors (190, 194 to 196). The base (101) is a part supported on a flat ground and may include a bottom plate (102) having a roughly rectangular planar shape and a collision table (105) fixedly supported on the upper surface of the bottom plate (102).

[0031] A test sheet (10) is detachably installed in the cage (160). The cage (160) may include a cage frame (161), a sheet support plate (162), a ceiling wall (164), side walls (165, 166), a front door (167), a rear door (not shown), and a rolling roller (169). The cage frame (161) forms the skeleton of the cage (160) which is approximately cuboid in shape. The test sheet (10) may be installed inside the cage frame (161).

[0032] The sheet support plate (162), ceiling wall (164), side walls (165, 166), front door (167), and rear door (not shown) can be fixedly supported on the cage frame (161). The test sheet (10) can be detachably fixed to the sheet support plate (162) by means of a fastener (199).

[0033] A fastener through hole (163) may be formed in the sheet support plate (162) so that the fastener (199) can pass through the sheet support plate (162) and be fastened to the test sheet (10). Test sheets (10) of various types and sizes may be installed eccentrically on the sheet support plate (162) not only in the center of the sheet support plate (162) but also on one side. To this end, the fastener through hole (163) may be provided in multiple numbers, and the multiple fastener through holes (163) may be distributed spaced apart from each other.

[0034] The ceiling wall (164) may be positioned above the seat support plate (162) and spaced apart from the seat support plate (162). One side wall (165) and the other side wall (166) may be positioned spaced apart from each other in the left-right direction between the seat support plate (162) and the ceiling wall (164). The front door (167) and the rear door (not shown) may be positioned spaced apart from each other in the front-back direction between the seat support plate (162) and the ceiling wall (164).

[0035] The internal space (168) in which the test sheet (10) is installed may be limited by the sheet support plate (162), ceiling wall (164), side walls (165, 166), front door (167), and rear door (not shown). The front door (167) and the rear door (not shown) may be detachably connected and supported to at least one of the sheet support plate (162), ceiling wall (164), side walls (165, 166), and cage frame (161).

[0036] When one of the front door (167) and the rear door is removed from the cage (160), the interior space (168) is opened to the front or rear of the cage (160), so that a worker can install a test sheet (10) in the interior space (168).

[0037] The test sheet (10) may be, for example, an explosion-proof sheet that protects the seated person by cushioning the impact caused by the explosion of an explosive. The test sheet (10) may include a buttock support (14), a backrest (20), and a seat base (11). The buttock support (14) supports the buttocks of the seated person. The backrest (20) is a part that supports the back of the seated person and may extend upward from the buttock support (14).

[0038] The seat base (11) supports the buttock support (14) and can be detachably fixed to the seat support plate (163). For example, the test seat (10) can be fixedly supported on the seat support plate (163) by fastening a fastener (199), such as a bolt and nut, to the seat base (11) through the fastener through hole (163).

[0039] When performing a drop impact test using a sheet drop impact test device (100), weights (30, 35) may be supported on the test sheet (10). The weights (30, 35) are intended to simulate a person sitting on the test sheet (10), and, for example, weights (30, 35) corresponding to the weight of the person may be supported on the buttock support (14) of the test sheet (10) by means of a fixing means such as a seat belt.

[0040] Multiple weights (30, 35) can be supported on the test sheet (10), and the multiple weights (30, 35) may have different weights. By combining the multiple weights (30, 35), weights corresponding to, for example, an adult male, an adult female, a child, and an infant can be loaded onto the test sheet (10).

[0041] Rolling rollers (169) may be positioned on the left and right sides of the cage frame (161). Multiple rolling rollers (169) may be positioned spaced apart in the vertical direction. Multiple rolling rollers (169) cause the cage (160) to move up and down along the length direction of the lifting guide (113), that is, in the vertical direction.

[0042] The lifting unit (120) moves the cage (160) in an upward direction away from the base (101) and in a downward direction toward the base (101). The lifting unit (120) may include an intermediate member (130), a crane (121), and a connector (128). The intermediate member (130) may be detachably connected to a locking unit (140).

[0043] The intermediate member (130) may include a locking pin (132) and a rolling roller (135). The locking pin (132) may be detachably connected to a locking unit (140). The locking pin (132) is provided at the bottom of the intermediate member (130). The rolling roller (135) may be positioned on the left and right sides of the intermediate member (130). Multiple rolling rollers (135) may be spaced apart in the vertical direction. The multiple rolling rollers (135) cause the intermediate member (130) to move up and down along the longitudinal direction of the lifting guide (113), that is, in the vertical direction.

[0044] The crane (121) suspends and supports the intermediate member (130) and raises the intermediate member (130). The crane (121) is positioned above the cage (160), and the intermediate member (130) can be positioned between the crane (121) and the cage (160).

[0045] The crane (121) may include a crane body, a hook (123) attached to the end of a chain, and a chain box (125) supported on the crane body. An electric motor (not shown) may be built into the crane body. When the chain is inserted into the crane body by the power of the electric motor, the hook (123) may rise, and when the chain is discharged from the crane body, the hook (123) may lower. The chain inserted into the crane body is stored in the chain box (125). The chain box (125) may be supported on the crane body.

[0046] The connector (128) connects the upper part of the intermediate member (130) and the hook (123) of the crane (121). When the crane (121) and the intermediate member (130) are connected by the connector (128) and the intermediate member (130) and the cage (160) are connected by the locking unit (140), and the crane (121) is operated to raise or lower the hook (123), the intermediate member (130), the cage (160), and the test sheet (10) installed on the cage (160) rise or fall together.

[0047] The locking unit (140) connects the lifting unit (120) and the cage (160) so that the lifting unit (120) and the cage (160) move together, and optionally releases the connection between the lifting unit (120) and the cage (160) so that the cage (160) falls from above the base (101) toward the base (101).

[0048] The locking unit (140) may include a mounting base (141), a trigger (150), a guide rail (148), and a trigger actuator (143). The mounting base (141) may be fixedly coupled to the upper part of the cage frame (161). The trigger (150) may slide horizontally relative to the cage (160). Specifically, the guide rail (148) may be fixedly coupled to the mounting base (141), and the trigger (150) may be coupled so as to slide horizontally relative to the guide rail (148) without being separated from the guide rail (148).

[0049] The trigger (150) includes a trigger body (151) and a locking projection (152). The lower part of the trigger body (151) may be slidably coupled to a guide rail (148). The trigger body (151) may be provided with a locking pin insertion groove (153) that is open to the upper side. A locking pin (132) may be inserted into the locking pin insertion groove (153). For example, the width in the left-right direction inside the locking pin insertion groove (153) may be greater than twice the diameter of the locking pin (132).

[0050] The locking projection (152) may protrude and extend horizontally so that the width in the left-right direction of the entrance (154) of the locking pin insertion groove (153) becomes narrower than the width in the left-right direction inside the locking pin insertion groove (153). The locking projection (152) is formed integrally with the trigger body (150) and may be extended from the trigger body (150).

[0051] The length of the left-right direction of the locking projection (152) may be larger than the diameter of the locking pin (132). The width of the left-right direction of the opening (154) of the locking pin insertion groove (153) may be larger than the diameter of the locking pin (132).

[0052] When the cage (160) is supported on the base (101) and the entrance (154) of the locking pin insertion groove (153) and the locking pin (132) are aligned vertically, the intermediate member (130) descends vertically, allowing the locking pin (132) to pass through the entrance (154) and be inserted into the locking pin insertion groove (153). In this state, when the trigger (150) moves horizontally to either the left or the right side, the locking projection (152) is positioned above the locking pin (132) so as to overlap with the locking pin (132), as shown in FIG. 5. In this case, the intermediate member (130) and the cage (160) are connected, so when the intermediate member (130) is raised, the cage (160) also rises together with the intermediate member (130).

[0053] As illustrated in FIG. 6, when the trigger (150) moves to the opposite side of either the left or right side so that the entrance (154) and the locking pin (132) are aligned vertically, the connection between the intermediate member (130) and the cage (160) can be released. In this state, when the lifting member (130) rises, the lifting member (130) rises so that it is detached from the cage (160), and the cage (160) can be left separated from the lifting member (130).

[0054] The trigger actuator (143) provides power to move the trigger (150) in the direction in which the lifting unit (120) and the cage (160) are connected and in the opposite direction. For example, the trigger actuator (143) may include a pneumatic cylinder supported on a mounting base (141).

[0055] A pneumatic cylinder may include a cylinder body fixedly coupled to a mounting base (141) and a cylinder rod (145) whose end is coupled to a trigger (150). When pneumatic pressure is applied to the cylinder body, the cylinder rod (145) moves in a direction protruding from the cylinder body, and when pneumatic pressure is not applied to the cylinder body, the cylinder rod (145) can return to its original position.

[0056] Unlike the trigger actuator (143) shown in FIGS. 1, 3, and 4, the trigger actuator included in the present invention may include other types of power generating means, such as a solenoid or an electric motor, instead of a pneumatic cylinder.

[0057] The sheet drop impact test device (100) may further include a vertical column (110), a bridge (117), and a drop prevention unit (173). The vertical column (110) may be provided as a pair so as to be positioned on the left and right sides with the cage (160) and the lifting unit (120) in between. Each of the pair of vertical columns (110) may have its lower end supported by the base (101) and may extend upward in a vertical direction.

[0058] Each vertical column (110) may include a pair of vertical plates (111) and a lifting guide (113). The pair of vertical plates (111) may be spaced apart facing each other in the front-rear direction and extend in the vertical direction. The lifting guide (113) extends in the vertical direction and may be fixedly supported on the pair of vertical plates (111). The lifting guide (113) may be positioned to face and contact a plurality of rolling rollers (169) of the cage (160) and a plurality of rolling rollers (135) of the intermediate member (130).

[0059] A lifting guide (113) may include a guide groove (115) that is cut inward from the surface and extends in the vertical direction so that a plurality of rolling rollers (135, 169) are fitted into it to slide in the vertical direction. As a plurality of rolling rollers (169) are slidably fitted into the guide groove (115), the cage (160) can be lifted vertically without tilting when suspended from the lifting unit (120) and lifted or free-falling. Additionally, as a plurality of rolling rollers (135) are slidably fitted into the guide groove (115), the intermediate member (130) can be lifted vertically without tilting when suspended from the hook (123) of the crane (121).

[0060] The bridge (117) can be fixed and supported at one side and the other side in the left-right direction at the top of a pair of vertical columns (110). The bridge (117) may include a pair of connecting plates (118) spaced apart and facing each other in the front-rear direction. One side and the other side in the left-right direction of each connecting plate (118) can be connected to the top of the vertical plate (111).

[0061] A support pin (119) that passes through a pair of connecting plates (118) and is supported may be installed at the midpoint of the bridge (117) in the left and right directions. A crane (121) may be supported on the support pin (119).

[0062] The fall prevention unit (173) prevents the unintended fall of the cage (160) caused by a malfunction or damage to the locking unit (140). The fall prevention unit (173) helps prevent safety accidents to a worker performing work required for a sheet drop impact test around the sheet drop impact test device (100) after raising the cage (160) away from the base (101). The fall prevention unit (173) can be supported on a vertical column (110). A pair of fall prevention units (173) can be provided in correspondence with a pair of vertical columns (110).

[0063] The fall prevention unit (173) may include a bracket (174), a fall prevention actuator (180), and an extension bar (184). The bracket (174) may be fixedly supported on a pair of opposing vertical columns (110) belonging to the vertical column (110). The extension bar (184) extends in a horizontal direction. The extension bar (184) is movable between a first position protruding toward the cage (16) to block the fall of the cage (160) and a second position moving away from the cage (160) to allow the fall of the cage (160).

[0064] When the extension bar (184) is in the first position, the end of the extension bar (184) may be in frictional contact with the cage (160), inserted into a through hole or groove formed in the cage (160), or positioned to cross the cage frame (161) from below the cage frame (161).

[0065] A bracket (174) and a lifting guide (113) may have a bracket through-hole (177) and a guide through-hole (114) through which an extension bar (184) passes. A fall prevention actuator (180) provides power to move the extension bar (184) between a first position and a second position. For example, the fall prevention actuator (180) may include a pneumatic cylinder supported by the bracket (174).

[0066] A pneumatic cylinder may include a cylinder body fixedly coupled to a bracket (174) and a cylinder rod (182) whose end is coupled to an extension bar (184). When pneumatic pressure is applied to the cylinder body, the cylinder rod (182) moves in a direction protruding from the cylinder body, and when pneumatic pressure is not applied to the cylinder body, the cylinder rod (182) can return to its original position.

[0067] Unlike the fall prevention actuator (180) shown in FIG. 8, the fall prevention actuator included in the present invention may include other types of power generating means, such as a solenoid or an electric motor, instead of a pneumatic cylinder.

[0068] Impact measuring sensors (190, 194 to 196) measure the impact when the falling cage (160) stops due to a collision. The impact measuring sensors (190, 194 to 196) may include a base-mounted load cell (190), a cage-mounted acceleration sensor (194), a seat-mounted acceleration sensor (195), and a seat-mounted load cell (196).

[0069] The base-mounted load cell (190) is installed on the base (101). When the cage (160) is separated from the intermediate member (130) and falls, the base-mounted load cell (190) collides with the cage (160). The base-mounted load cell (190) can measure the load when the cage (160), on which the test sheet (10) and weights (30, 35) are installed, falls and a collision occurs.

[0070] The load measured by the base-mounted load cell (190) may be equal to the total impact force transmitted to the test sheet (10). In the case of the embodiment shown in FIGS. 1 and FIGS. 7, when the cage (160) is separated from the intermediate member (130) and falls, it directly collides with the base-mounted load cell (190), but the present invention is not limited thereto. For example, the base-mounted load cell may be installed in the base so as to be embedded in the base, and the base may be configured to directly collide with the base when the cage falls.

[0071] The cage (160) may further include a collision plate (170). The collision plate (170) may be detachably installed on the lower part of the cage frame (161). When the cage (160) falls toward the base (101), the collision plate (170) may directly collide with the base-installed load cell (190). If the collision plate (170) and the base (10) or the base-installed load cell (190) collide directly and the collision plate (170) is damaged, the damaged collision plate (170) may be detached from the cage frame (161), and the undamaged collision plate (170) may be installed on the cage frame (161).

[0072] If there is no impact plate (170), the falling cage (160) collides strongly with the base (101) or the base-mounted load cell (190), increasing the likelihood of damage to the cage frame (161). This may increase the operating cost of the sheet drop impact test device (100).

[0073] A cage-installed acceleration sensor (194) can be installed in the cage (160). The cage-installed acceleration sensor (194) can measure the acceleration applied to the cage (160) when the cage (160) with the test sheet (10) and weights (30, 35) installed falls and a collision occurs.

[0074] The sheet installation acceleration sensor (195) can be installed on the test sheet (10). The sheet installation acceleration sensor (195) can measure the acceleration cushioned by the test sheet (10) when the test sheet (10) and the cage (160) with weights (30, 35) installed fall and a collision occurs.

[0075] A sheet-mounted load cell (196) can be installed on a test sheet (10). The sheet-mounted load cell (196) can measure the load cushioned by the test sheet (10) when a collision occurs as the test sheet (10) and the cage (160) with weights (30, 35) installed fall.

[0076] The sheet drop impact test device (100) may further include a drop speed sensor (193), a displacement sensor (191), and a drop weight measuring load cell (not shown). The drop speed sensor (193) can measure the drop speed of the cage (160) until a collision occurs when the cage (160) equipped with the test sheet (10) and weights (30, 35) is dropped. The drop speed sensor (193) may be installed in the cage (160).

[0077] The displacement sensor (191) measures the height to which the cage (160) is raised while suspended from the lifting unit (120) for dropping. The displacement sensor (191) may be installed on a vertical column (110). The drop weight measuring load cell measures the total weight of the object being raised while suspended from the lifting unit (120) for the drop test. In other words, the drop weight measuring load cell can measure the sum of the weights of the cage (160), the locking unit (140), the test sheet (10), and the weights (30, 35). The drop weight measuring load cell may be installed, for example, on a connector (128).

[0078] For example, after performing a test of dropping the cage (160), the magnitude of the impact applied to a person when sitting on the test seat (10) can be determined through the measurement value measured by the seat installation load cell (196) or the seat installation acceleration sensor (195), which corresponds to the sum of the weights (30, 35).

[0079] For example, the magnitude of the impact cushioned by the test sheet (10) can be determined through the measurement obtained by subtracting the measurement from the sheet installation acceleration sensor (195) from the measurement from the cage installation acceleration sensor (194).

[0081] The present invention has been described with reference to an embodiment illustrated in the drawings, but this is merely illustrative, and those skilled in the art will understand that various modifications and equivalent alternative embodiments are possible therefrom. Accordingly, the true scope of protection of the present invention should be determined only by the appended claims. Explanation of the symbols

[0083] 10: Test sheet 30, 35: Weights 100: Sheet drop impact test device 101: Base 110: Vertical column 113: Lifting guide 117: Bridge 130: Elevator Unit 121: Crane 130: Intermediate member 140: Locking Unit 160: Cage 169: Rolling Roller 170: Collision Plate 173: Drop prevention unit 190, 194 to 196: Impact measuring sensors

Claims

Claim 1 A base; a cage including a cage frame on which a test sheet is detachably installed; a lifting unit for moving the cage in an upward direction spaced apart from the base and in a downward direction toward the base; a locking unit for connecting the lifting unit and the cage so that the lifting unit and the cage move together, and for selectively releasing the connection between the lifting unit and the cage so that the cage falls from above the base toward the base; and a shock measuring sensor installed on at least one of the base, the cage, and the test sheet, for measuring the impact when the falling cage stops due to a collision; wherein the lifting unit includes a locking pin detachably connected to the locking unit, and the locking unit includes a mounting stand fixedly coupled to the upper part of the cage frame, a guide rail fixedly coupled to the mounting stand, a trigger slidably coupled to the guide rail in a horizontal direction without being separated from the guide rail, and a trigger actuator supported on the mounting stand and providing power to move the trigger in the direction in which the lifting unit and the cage are connected and in the opposite direction, and the trigger includes a trigger body slidably coupled to the guide rail and having a locking pin insertion groove open to the upper side, and a locking projection extending from the trigger body, which protrudes and extends horizontally such that the width of the entrance of the locking pin insertion groove becomes narrower than the width of the interior of the locking pin insertion groove, and the length of the locking projection is greater than the diameter of the locking pin, and the locking pin A sheet drop impact test device characterized in that the width of the opening of the insertion groove is larger than the diameter of the locking pin. Claim 2 A sheet drop impact test device according to claim 1, wherein the impact measuring sensor comprises a base-installed load cell installed on the base and colliding with the cage that is falling. Claim 3 A sheet drop impact test device according to claim 2, wherein the cage is detachably installed on the cage frame and includes a collision plate that directly collides with the base-installed load cell when the cage falls. Claim 4 A sheet drop impact test device according to claim 1, wherein the impact measuring sensor comprises a sheet installation load cell installed on the test sheet. Claim 5 A sheet drop impact test device according to claim 1, wherein the impact measuring sensor comprises a cage-installed acceleration sensor installed in the cage and a sheet-installed acceleration sensor installed in the test sheet. Claim 6 A sheet drop impact test device according to claim 1, further comprising a speed sensor installed in the cage to measure the drop speed of the cage. Claim 7 A sheet drop impact test device according to claim 1, further comprising a displacement sensor for measuring the height to which the cage is raised to drop. Claim 8 delete Claim 9 A sheet drop impact test device according to claim 1, further comprising a drop prevention unit that prevents unintended dropping of the cage due to malfunction or damage of the locking unit. Claim 10 A sheet drop impact test device according to claim 9, further comprising: a lifting guide that guides the cage so as not to tilt when it is lifted or lowered, and a vertical column that supports the drop prevention unit. Claim 11 A sheet drop impact test device according to claim 1, wherein the lifting unit comprises an intermediate member detachably connected to the locking unit, and a crane that suspends and supports the intermediate member and lifts the intermediate member. Claim 12 A sheet drop impact test device according to claim 1, characterized in that a weight is supported on the test sheet.

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