Electric stone crushing tool

Abstract

This invention provides a construction technology for a stone crushing tool that avoids complicating the working environment. The electric stone crushing tool (101) has a motor, a motion conversion mechanism, and a crushing part (180), wherein the motor has an output shaft; the motion conversion mechanism converts the rotational output from the output shaft into linear motion; and the crushing part (180) clamps and crushes the stone through the linear motion of the motion conversion mechanism.

Description

Technical Field

[0001] This invention relates to an electric stone material crushing tool. Background Technology

[0002] An example of a stone crushing tool is disclosed in Japanese Utility Model Publication No. 3-27174. This stone crushing tool has a crushing section that clamps and crushes the stone, and a hydraulic cylinder for driving the crushing section. The stone material can be, for example, concrete structures. To crush this stone, a relatively strong crushing force is required. Furthermore, to ensure this strong crushing force using the hydraulic cylinder, although not specifically illustrated in this prior art, a compressor for supplying pressurized fluid to the hydraulic cylinder, a power supply for driving the compressor, and a pressurized fluid delivery hose connecting the compressor and the hydraulic cylinder are required. Therefore, the prior art stone crushing tool suffers from the following problems: the number of necessary accessories, including its auxiliary equipment, increases, and the working environment becomes more complex.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Utility Model Publication No. 3-27174 Summary of the Invention

[0006] In view of the above, the purpose of this invention is to provide a construction technology for a stone crushing tool that can avoid complicating the working environment.

[0007] To solve the above-mentioned technical problems, an electric stone crushing tool is constructed according to one aspect of the present invention.

[0008] The stone crushing tool has a motor, a motion conversion mechanism, and a crushing part. The motor has an output shaft. The motion conversion mechanism converts the rotational output from the output shaft into linear motion. The crushing part clamps (compresses) the stone and crushes it through the linear motion of the motion conversion mechanism.

[0009] "Stone" as a material to be broken includes, broadly speaking, concrete, natural stone, artificial stone, and man-made stone.

[0010] In addition, "crushing (squeezing) and breaking stone" broadly includes crushing by pressure from both sides, cutting with opposing blades, breaking by shearing force, or a combination thereof.

[0011] Based on the aforementioned stone crushing tool, the crushing unit is electrically driven, unlike the previous hydraulic system, eliminating the need for equipment such as compressors and pressure fluid delivery hoses, thus simplifying and refining the working environment.

[0012] In one aspect of the invention, the motion conversion mechanism is configured as a screw feed mechanism having a threaded portion and a nut portion that engages with the threaded portion. Typically, a ball screw mechanism is an example of this motion conversion mechanism.

[0013] By employing a screw feed mechanism, high torque can be efficiently converted into linear motion, and the durability of the device can be improved while reliably transmitting power for stone crushing.

[0014] As one aspect of the present invention, the output shaft is connected to the threaded portion and configured such that the nut portion moves linearly along the threaded portion by the rotational action of the threaded portion.

[0015] "Connection to the threaded side" will not prevent the placement of other functional components between the output shaft and the threaded part.

[0016] By configuring the nut part to undertake the linear motion as a driven component and to move along the threaded part, the moving part of the movable body can be contained within the size of the threaded part, making it easier to deal with dust prevention, etc., without needing to unnecessarily increase the size of the housing structure.

[0017] As one aspect of the present invention, the crushing part has a clamping part that clamps the stone in a predetermined clamping direction, and is configured such that the linear motion direction in the motion conversion mechanism becomes the clamping direction.

[0018] The linear motion direction in the motion conversion mechanism is the clamping direction, which enables the overall length of the stone crushing tool (the direction intersecting the clamping direction) to be compact.

[0019] Furthermore, regarding the "direction of linear motion" or "clamping direction," due to the specific mechanical mechanism employed, it is not necessary to form a geometrically strict linear motion or direction; it is sufficient to have a linear motion direction component or an approximate linear motion mode.

[0020] As one aspect of the present invention, the output shaft is configured such that its extension direction becomes the clamping direction.

[0021] Regarding the motor configuration, its structure is such that the output shaft extends along the clamping direction, which further compresses the overall length of the tool.

[0022] As one aspect of the present invention, it is configured to have a rotational motion conversion unit, which further converts the linear motion of the motion conversion mechanism into rotational motion, and the crushing unit crushes the stone through the rotational motion of the rotational motion conversion unit.

[0023] The rotary motion conversion section and the crushing section can also be the same (single) component structure.

[0024] Alternatively, it can be configured such that when the rotary motion conversion unit performs the rotary motion conversion, the lever action is used to further increase the crushing force.

[0025] As one aspect of the present invention, it is configured to include a position detection unit that detects a predetermined first position and a second position during the crushing operation, and a controller that performs drive control of the motor based on the detection results of the position detection unit.

[0026] Typically, position 1 can be used to set the start position of the operation, and position 2 can be used to set the end position of the operation. For example, the following action can be used: after starting the stone crushing operation from position 1 and detecting position 2, the motor is reversed to return to the initial position.

[0027] From the viewpoint of ease of inspection and reliability, the following structure is preferred: for example, a first position and a second position are set in the linear motion section of the motion conversion mechanism.

[0028] Alternatively, based on a predefined reference position, drive control can also be performed according to the motor speed (historical data on how many revolutions the motor has made since starting from the reference position).

[0029] As one aspect of the present invention, the configuration position can be changed for at least one of the first position and the second position.

[0030] Typically, the following methods can also be used: the configuration position can be changed manually by the operator, and switched appropriately according to the work method. For example, the initial position setting can be changed by changing the configuration position of the first position, which is the start position of the work, or the work stroke can be changed by changing the relative distance between the first position and the second position, which is the maximum movable position.

[0031] In addition, the configuration position can be automatically changed according to the material and size of the stone.

[0032] According to one aspect of the present invention, the device is configured to include a stone breakage detection unit, and the drive control of the motor is performed based on the detection result of the breakage detection unit.

[0033] This method can be combined with or set independently of the aforementioned position detection unit. When breakage is detected, the motor is driven and controlled to return to the initial position. It can be configured such that, when combined with the position detection unit, for example, if the first position is the initial position and the second position is the maximum working position, and the breakage detection unit detects stone breakage before reaching the second position (e.g., when breakage is completed with relatively low stone clamping (compression)), the initial position return operation is performed before reaching the second position. This shortens the work stroke and improves work efficiency.

[0034] In addition, the "breakage" in "breakage detection" includes not only complete breakage where the stone breaks and separates, but also breakage where the broken part penetrates the stone.

[0035] In addition, the "detection" can be appropriately selected from the following methods: for example, based on changes in parameters such as motor drive current, drive voltage, output torque, battery current, battery voltage, torque or axial force in the power transmission path, or based on monitoring the movement of the crushing part.

[0036] Taking into account the simplicity and accuracy of the testing mechanism, it is preferable to perform the crushing test based on the torque or axial force in the power transmission path.

[0037] According to one aspect of the present invention, a planetary gear reduction mechanism is arranged between the output shaft and the motion conversion mechanism.

[0038] By using a planetary gear reduction mechanism, the structure of the device used for speed reduction can be made more compact.

[0039] According to one aspect of the invention, it also includes a handle for operator gripping and a battery for driving the motor, the battery being disposed in the vicinity of the handle, and the handle also serving as a battery protection unit.

[0040] Using a battery for power simplifies the working environment. Preferably, the battery is easily removable. Furthermore, by using the handle as a battery protector, efficient use of components is achieved.

[0041] According to the present invention, a construction technology for a stone crushing tool that can avoid complicating the working environment is provided. Attached Figure Description

[0042] Figure 1 This is a perspective view showing the overall structure of the stone crushing tool involved in this embodiment.

[0043] Figure 2 This is a front sectional view of a stone crushing tool.

[0044] Figure 3This is a partial sectional view showing the structure of the upper area of ​​the stone crushing tool.

[0045] Figure 4 This is a partial sectional view showing the working state of the stone crushing tool.

[0046] Figure 5 This is a front sectional view showing the working state of the stone crushing tool. Detailed Implementation

[0047] Below, refer to Figures 1-5 The stone crushing tool 101 involved in the implementation method will be described.

[0048] The stone crushing tool 101 is an example of a "stone crushing tool" as described in this invention.

[0049] exist Figure 1 The overall structure of the stone crushing tool 101 is shown in a three-dimensional view. Additionally, in... Figure 2 The overall structure of the stone breaking tool 101 is shown in a front sectional view. Furthermore, in... Figure 3 The detailed structure of the upper region of the stone crushing tool 101 is shown in a partial sectional view. In this embodiment, for ease of explanation, the width direction of the stone crushing tool 101 (in...) is used to illustrate the detailed structure. Figures 1-3 The left-right direction of the paper is defined as the first direction D1, and the up-down direction that intersects the width direction (in the middle of the paper) is defined as the first direction D1. Figures 1-3 The direction from top to bottom on the paper is defined as the second direction, D2.

[0050] In addition, the first direction D1 is consistent with the stone clamping direction C described later.

[0051] In this embodiment, "stone" broadly includes concrete, natural stone, artificial stone, and man-made stone.

[0052] (Appearance and Structure)

[0053] like Figure 1 As shown, the stone crushing tool 101 generally has a housing 110, a handle 130, and a crushing part 180 in appearance.

[0054] (Schematic structure of housing 110)

[0055] The housing 110 has a first housing 111 and a second housing 112.

[0056] (First shell 111)

[0057] First shell 111 containment Figure 3The motor 140 and part of the mechanism that receives the output from the motor 140, etc., will be described in detail later. On the first housing 111, an operation unit 135 based on operator manual input for operating the stone crushing tool 101 is arranged adjacent to it. The operation unit 135 is provided with an operation switch for manual input and a display unit (details omitted for simplicity).

[0058] (Second shell 112)

[0059] like Figure 1 As shown, the second housing 112 is connected to the first housing 111 in the lower adjacent region. The second housing 112 mainly houses the first housing 111. Figure 3 The motion conversion mechanism 160 shown will be described in detail later.

[0060] The second housing 112 has: a second housing base 113 connected to the first housing 111 in a manner that prevents it from moving relative to the first housing 111; and a second housing movable portion 115 configured to move relative to the second housing base 113 in a first direction D1.

[0061] The base 113 and movable part 115 of the second housing are integrally formed at their respective end regions with fragmentation connection parts 1131 and 1151 for the (described later) fragmentation part 180.

[0062] (The structure of handle 130)

[0063] like Figure 1 As shown, the handle 130 has a pair of first handles 131 and second handles 132 as a pair. The first handles 131 and 132 are fixedly connected to the first housing 111. In addition, the second handles 132 and 132 are fixedly connected to the first arm 181 and the second arm 182 of the breaking section 180, which will be described later.

[0064] In the upper part of the first housing 111 and in the area 133 near the first handle between the pair of first handles 131, the power supply battery 146 is installed in the first housing 111 in a removable manner.

[0065] (Structure of the 180-degree fracture section)

[0066] The crushing section 180 is mainly composed of a pair of first arms 181 and second arms 182. The first arms 181 and second arms 182 are respectively formed into a forked shape at their upper ends and are assembled into crushing section connecting parts 1131 and 1151 on the second housing 112 in a fitting manner. Furthermore, the first arms 181 and second arms 182 are connected to the crushing section connecting parts 1131 and 1151 in a rotatable manner via first connecting rods 1811 and 1821, respectively.

[0067] The first arm 181 and the second arm 182 have stone clamping parts 1813 and 1823 respectively in the top area on the lower side. The stone clamping parts 1813 and 1823 have top protrusions 1815 and 1825 and middle protrusions 1816 and 1826.

[0068] (The definition of "fragmented", etc.)

[0069] The "crushing" performed by the crushing section 180 includes crushing the stone, cutting the stone, and crushing the stone by shearing force. For example, when using the top protrusions 1815, 1825 or the middle protrusions 1816, 1826, a combined crushing or cutting or shearing effect is produced. Furthermore, when using parts other than the top protrusions 1815, 1825, and the middle protrusions 1816, 1826, a crushing-based damage effect is produced.

[0070] In addition, the degree of “fracture” includes not only complete shattering, such as the stone breaking and separating, but also the degree to which the broken part penetrates the stone even though the stone has not separated.

[0071] (Connection of Arm 181 and Arm 282)

[0072] like Figure 1 As shown, the first arm 181 and the second arm 182 are rotatably connected to the arm interconnection part 183 having a pair of plate-shaped members via the second connecting rods 1812 and 1822 respectively, thereby being integrally connected in a manner that allows them to move relative to each other.

[0073] Additionally, as shown in the front sectional view of the stone breaking tool 101 Figure 2 As shown, the first arm 181 and the second arm 182 have engaging portions 1814 and 1824 at the arm interconnection portion 183, which are composed of concave portions and convex portions that engage with each other.

[0074] In addition, such as Figure 2 As shown, the pair of second handles 132 are fixedly connected to the first arm 181 and the second arm 182 respectively via the second handle fixing parts 1321 and 1322.

[0075] (Internal structure of stone crushing tool 101)

[0076] Next, mainly refer to Figure 3 The internal structure of the upper part of the stone crushing tool 101 will be described in detail.

[0077] (Battery 146)

[0078] Battery 146 has a battery terminal 147 for power supply, and is positioned in approximately the first direction D1 (in this embodiment, in...). Figure 3 The battery mounting portion 149, located on the upper part of the first housing 111, is slidably mounted to the main body side (left side of the paper) in a detachable manner. During installation, the engaging protrusion 1471 of the battery 146 and the engaging protrusion 1491 of the battery mounting portion 149 engage with each other, thereby preventing the battery 146 from accidentally falling off.

[0079] (First shell 111)

[0080] The first housing 111, which is a structural element of the housing 110, houses: a motor 140 having an output shaft 143 and a cooling fan 144; a controller 145 for driving control of the motor 140; a planetary gear reduction mechanism 150 connected to the output shaft 143 and receiving the rotational output of the motor 140; a first gear 151 receiving the rotational output of the planetary gear reduction mechanism 150; and a portion of an idler gear 152 receiving the rotation of the first gear 151. The motor 140 is configured such that the major axis of the output shaft 143 extends in the first direction D1, that is, is substantially parallel to the first direction D1.

[0081] In this embodiment, a brushless motor is used as the motor 140. The brushless motor, by eliminating the brushes used for power supply, is relatively small and can achieve high power, thus making it suitable for use in the stone crushing tool 101. Furthermore, by using a planetary gear reduction mechanism 150 in the power transmission path from the motor 140, the structure of the power transmission device can be made more compact.

[0082] Furthermore, the structures of the motor 140, the planetary gear reduction mechanism 150, and the controller 145 are themselves well-known technologies; therefore, descriptions of their mechanical structures are omitted and will be included in [the following text]. Figure 3 The diagram is shown schematically.

[0083] (Motion conversion mechanism 160 within the second housing 112)

[0084] A ball screw mechanism serving as a motion conversion mechanism 160 is housed within the second housing 112. This ball screw mechanism comprises a ball screw shaft 161 and a nut 163 as its main components. The ball screw shaft 161 is configured such that its long axis extends in the first direction D1. In other words, the ball screw shaft 161 is configured such that its long axis is substantially parallel to the first direction D1. This ball screw mechanism with the ball screw shaft 161 and nut 163 is an example of a "screw feed mechanism" in this invention. Furthermore, the screw-in structure of the ball screw shaft 161 and nut 163 is itself known technology; therefore, a description of its physical structure is omitted. Figure 3 The diagram is shown schematically.

[0085] (Ball screw shaft 161 and load cell 179)

[0086] A first cap 1611 and a second cap 1612 are provided at both ends of the ball screw shaft 161. A load sensor 179 is disposed between the first cap 1611 and the ball screw shaft 161. In addition, a fixing screw 1613 is provided on the second cap 1612.

[0087] The load sensor 179 is configured to detect the axial force acting on the ball screw shaft 161 in the first direction D1 and send the detection result to the controller 145. This allows for the detection of the progress of the stone crushing operation. For example, the start time of the stone crushing operation can be detected by an increase in the axial force, and the stone crushing time can be detected by a sharp decrease in the axial force. Furthermore, in addition to the axial force itself, the change in axial force, its derivative or integral value, or a combination thereof, can be appropriately used to determine the progress of the stone crushing operation.

[0088] The ball screw shaft 161 is supported on the base of the second housing 113 by a radial bearing 164 in a manner that allows it to rotate about the first direction D1.

[0089] In addition, the ball screw shaft 161 is axially supported in the first direction D1 by the first thrust bearing 165 and the second thrust bearing 166 in a state of bearing an axial force in the first direction D1 and attached to the base of the second housing 113.

[0090] At the end region of the ball screw shaft 161, the second gear 153 is fixed by a connecting key 155 disposed in the keyway. The second gear 153 is connected to the aforementioned idler gear 152. Therefore, the rotational output from the motor 140 is mechanically transmitted to the ball screw shaft 161 via the planetary gear reduction mechanism 150, the first gear 151, the idler gear 152, and the second gear 153, thereby driving the ball screw shaft 161 to rotate about the first direction D1.

[0091] In this embodiment, the rotational output of the motor 140 is appropriately reduced in speed by the planetary gear reduction mechanism 150, the first gear 151 and the second gear 153 before being transmitted to the ball screw shaft 161.

[0092] Furthermore, the second gear 153, in the portion clamped by the radial bearing 164, is fixed to the ball screw shaft 161 at both ends in a supported manner. Since the power transmission part can be supported by the shaft on both sides, the occurrence of unwanted vibrations and couples can be effectively suppressed.

[0093] (Nut 163)

[0094] Furthermore, the nut 163 is screwed onto the ball screw shaft 161 and is fixedly connected to the movable part 115 of the second housing. The base 113 of the second housing and the movable part 115 of the second housing are connected in a manner that allows movement relative to the first direction D1 but prevents relative rotation about the first direction D1. Therefore, when the ball screw shaft 161 rotates about the first direction D1, the nut 163 is configured such that, while its rotational movement about the first direction D1 is restricted, it can move relative to the first direction D1 through its screwing action with the ball screw shaft 161.

[0095] (Position detection structure for nut 163)

[0096] A nut linkage detection member 175 is also fixedly disposed in the movable part 115 of the second housing, to which the nut 163 is fixedly connected. On the other hand, in the first housing 111 (the upper part of the base 113 of the second housing), corresponding to the nut linkage detection member 175, a first position detection unit 177 and a second position detection unit 178 are disposed along a first direction D1. The nut linkage detection member 175, the first position detection unit 177, and the second position detection unit 178 constitute a nut position detection mechanism 171, typically constructed from a combination of a magnet and a magnetic sensor. In this embodiment, the nut linkage detection member 175 uses a magnet, and the first position detection unit 177 and the second position detection unit 178 use magnetic sensors.

[0097] Furthermore, when the first position detection unit 177 and the second position detection unit 178 detect the approach of the nut linkage detection member 175, they send the first position detection signal and the second position detection signal to the controller 145. The first position detection unit 177 corresponds to the initial state (initial position) before the stone crushing tool 101 starts operating, and the second position detection unit 178 corresponds to the maximum movable position of the second housing movable part 115 (i.e., the nut 163), which will be described later.

[0098] In addition, for example, a predetermined reference position can be set for the motor 140, and the position can be detected based on the rotational speed of the motor 140 (historical data on how many revolutions the motor 140 has made from the reference position).

[0099] (Connection structure between the second housing 112 and the fragmentation section 180)

[0100] In the second housing 112, the end region of the base 113 of the second housing (in Figure 3 The left end of the middle section forms the crushing section connection 1131. The first arm 181 of the crushing section 180 is rotatably connected to the crushing section connection 1131 via the first connecting rod 1811. On the other hand, the end region of the movable part 115 of the second housing (in Figure 2 The right end of the middle section forms the crushing section connection part 1151. The second arm 182 of the crushing section 180 is rotatably connected to the crushing section connection part 1151 via the first connecting rod 1821.

[0101] Next, the working method of the stone crushing tool 101 involved in this embodiment will be described.

[0102] (Initial state)

[0103] exist Figures 1-3 The image shows the initial state of the stone crushing tool 101 before it begins operation. In this state, the operator holds the handle 130 to move the stone crushing tool 101 and crush the stone W (in the work area) being crushed. Figure 2 (Shown schematically by dashed lines) Stone clamping parts 1813 and 1823 for distributing the crushed section 180. Figure 2 The diagram shows the state in which the top protrusions 1815 and 1825 are assigned to the predetermined crushing parts of the stone W. Additionally, the operator can select the middle protrusions 1816 and 1826 or other areas of the stone clamping parts 1813 and 1823 to assign to the predetermined crushing parts of the stone W, depending on the working environment or the material and strength of the stone W.

[0104] In this initial state, the first handle 131 and the second handle 132 are arranged side by side and extend toward the second direction D2.

[0105] like Figure 3 As shown, in the initial state, the nut 163 is located in a predetermined area of ​​the ball screw shaft 161 (near the ball bearing 164 or the second thrust bearing), and in this state, the nut position detection element 175 is positioned facing the first position detection unit 177. Furthermore, the first position detection unit 177 detects the nut position detection element 175 in an approaching state and sends a first position detection signal to the controller 145.

[0106] When the operator manually connects to the setting Figure 1 When the drive switch of the operation unit 135 shown is activated, Figure 3 The controller 145 shown puts the motor 140 into a drive state. Since a brushless motor is used as the motor 140, it is driven by PWM control of the controller 145. In this embodiment, the drive state of driving the motor 140 from its initial state is defined as "forward rotation". The rotational motion of the motor 140 is transmitted to the ball screw shaft 161 via the output shaft 143, planetary gear reduction mechanism 150, first gear 151, idler gear 152, and second gear 153, driving the ball screw shaft 161 to rotate about a first direction D1. Accordingly, the nut 163, which engages with the ball screw shaft 161, does not rotate but moves in the first direction D1 (in...). Figure 3 (The middle direction is to the right in the figure). When the nut 163 moves, the movable part 115 of the second housing, which is fixed to the nut 163, moves relative to the base 113 of the second housing. Similarly, the nut linkage detection element 175, which is integrated with the nut 163, also moves integrally with the nut 163.

[0107] Furthermore, a sealing element 116 (such as a rubber O-ring) is provided between the base 113 of the second housing and the movable part 115 of the second housing to maintain and cut off communication between the second housing 112 and the outside. Therefore, even when the movable part 115 of the second housing is moving, it effectively prevents dust and the like from entering the second housing 112 or grease from leaking out of the second housing 112 to the outside.

[0108] (The second position with the maximum range of motion: the movement of the broken part 180)

[0109] like Figure 4 As shown, the movement of nut 163 can continue until nut linkage detection unit 175 is detected by second position detection unit 178. In other words, second position detection unit 178 defines the maximum movable range of nut 163. In addition, the movable stroke of nut 163 is defined by the separation distance between first position detection unit 177 and second position detection unit 178 in the first direction D1.

[0110] As described above, the second arm 182 is rotatably connected to the break-off connection portion 1151 of the movable portion 115 of the second housing via the first connecting rod 1821. Therefore, as Figure 4 As shown, the second arm 182 rotates relative to the movable part 115 of the second housing as the nut 163 moves in the first direction D1. Additionally, the second handle 132, which is fixedly connected to the second arm 182... Figure 4 The second handle (132) on the right side of the handle also rotates.

[0111] (The rotational linkage between the first arm 181 and the second arm 182)

[0112] As described above, the first arm 181 and the second arm 182 are connected at the arm interconnection portion 183 by the second connecting rods 1812 and 1822 and the concave-convex engaging portions 1814 and 1824 (see reference). Figure 2 The result is, as Figure 5 As shown, when the second arm 182 rotates relative to the movable part 115 of the second housing, in conjunction with this rotation, the first arm 181 rotates relative to the base 113 of the second housing about the first connecting rod 1811. Additionally, the second handle 132, which is fixedly connected to the first arm 181... Figures 3-5 The second handle 132 on the left side also rotates together with the first arm 181. That is, the first connecting rods 1811, 1821, the second connecting rods 1812, 1822, the arm interconnection part 183, and the concave and convex engaging parts 1814, 1824 define the rotational motion conversion mechanism 185 of the first arm 181 and the second arm 182, and simultaneously define the automatic linkage mechanism related to the rotational motion, as well as the automatic linkage mechanism related to the rotational motion of the second handles 132, 132.

[0113] (Torque amplification mechanism)

[0114] In addition, such as Figure 2 and Figure 5 As shown, in this embodiment, the separation distances between the first connecting rods 1811, 1821 and the second connecting rods 1812, 1822, the separation distances between the second connecting rods 1812, 1822 and the stone clamping portions 1813, 1823 (in this embodiment, as an example, the top protrusions 1815, 1825 are used to break the stone), and the separation distances between the first connecting rods 1811, 1821 and the stone clamping portions 1813, 1823 are set in such a way that the rotational motion output of the rotational motion conversion mechanism 185 is greater than the output of the motion conversion mechanism 160 through lever action.

[0115] (Stone crushing operation)

[0116] In this state, such as Figure 5 As shown, the first arm 181 and the second arm 182 approach each other in the first direction D1, and the stone clamping parts 1813 and 1823 break the clamped stone W (in this embodiment, the top protrusions 1815 and 1825).

[0117] In this embodiment, the stone crushing direction C based on the first arm 181 and the second arm 182 is consistent with the first direction D1. In other words, the stone crushing direction C is configured to be approximately parallel to the first direction D1.

[0118] (Regression action)

[0119] like Figure 4 As shown, when the second position detection unit 178 detects the approach of the nut linkage detection unit 175, the controller 145 stops the drive of the motor 140 (forward rotation) and reverses the drive of the motor 140, causing the nut 163 to move towards the initial position.

[0120] Then, when the first position detection unit 177 detects the approach of the nut linkage detection element 175, it is considered to have returned to the initial position, and the controller 145 stops the reverse drive of the motor 140. Figures 1-3 (Indicates the initial position). Based on this, the working stroke of the stone crushing tool 101 is completed.

[0121] Alternatively, this return action can also be configured, for example, when the operator stops operating the control unit 135 (see reference). Figure 1 In the event of operation of the switch (e.g., trigger) in the device (e.g., release the press action), a return action is automatically performed.

[0122] Alternatively, the system could be configured so that automatic regression control is not performed, but rather the operator manually requests the regression operation. Manual regression operations can be performed, for example, by setting a dedicated regression switch (reset switch).

[0123] (Breakage detection by load sensor 179: Working stroke time reduction mechanism)

[0124] In this embodiment, the load sensor 179 is also configured to monitor axial force (see reference). Figure 3 ).

[0125] Specifically, during stone crushing operations, a strong axial force acts along the first direction D1 on the ball screw shaft 161, which is one of the power transmission paths from the motor 140 to the crushing unit 180. A load sensor 179, located at the end of the ball screw shaft 161 between it and the first cap 1611, detects this axial force and sends it to the controller 145. When the stone is crushed and the axial force acting on the ball screw shaft 161 decreases (decreases sharply), the controller 145 determines that the stone crushing operation is complete and stops driving the motor 140 until detected by the second position detection unit 178. Then, the motor 140 is driven in reverse to return to the initial position. That is, the return to the initial position is completed by the first position detection unit 177 detecting the approach of the nut linkage detection element 175.

[0126] According to this structure, the stone crushing operation can be detected by monitoring the axial force of the nut linkage detection element 175 before it approaches (i.e., before full stroke) at the second position detection unit 178, and the completion of the stone crushing operation can be detected by monitoring the axial force through the load sensor 179, thus enabling initial position return. Therefore, the operation stroke time can be shortened, which helps to further improve the working environment. In other words, the load sensor 179 constitutes the operation stroke time shortening mechanism in the stone crushing tool 101.

[0127] (Work schedule selection (1): The operator makes the selection manually)

[0128] It can also be configured so that the operator can selectively switch via the above-mentioned operating unit 135: perform initial position return based on the proximity detection of the nut linkage detection member 175 by the second position detection unit 178 (based on the working stroke of the maximum movable range), or detect the completion of stone crushing based on the change of axial force detected by the load sensor 179, thereby performing initial position return (shortened working stroke based on the initial position return of the stone crushing completion time point) before the second position detection unit 178 detects it.

[0129] (Work stroke selection (2): Standardize the detection of load sensor 179 by default)

[0130] Alternatively, the following structure can also be adopted: when the load sensor 179 detects that stone breaking is complete based on changes in axial force, the mode for initial position regression from that detection position is standardized (default), and the detection of the nut linkage detection element 175 by the second position detection unit 178 is defined as the "maximum permissible range of motion" in case the load sensor 179 fails to detect the stone. When this structure is adopted, the normal operating stroke can be shortened, and a safety margin can be ensured in case of detection failure.

[0131] (Change in the position detection part of nut 163)

[0132] The first position detection unit 177 and the second position detection unit 178 described above can be configured such that the placement of one or both of them can be changed in the first direction D1 within the first housing 111.

[0133] When the arrangement of the first position detection unit 177 relative to the first housing 111 is changed in the first direction D1, the first position, which is the initial position, is appropriately changed and adjusted.

[0134] Furthermore, when the arrangement of the second position detection unit 178 relative to the first housing 111 is changed in the first direction D1, the second position, which is the maximum range of motion, is appropriately changed and adjusted.

[0135] In addition, as a method of change, for example, the operator can manually change the configuration location, or the change can be made automatically using the test results of the properties of the stone (size, material, hardness, etc.) of the work object.

[0136] For example, if the separation distance between the first position detection unit 177 and the second position detection unit 178 is reduced, the travel distance from the initial position to the maximum range of motion can be shortened.

[0137] In addition, for example, by moving the first position detection unit 177 from its initial position to the moving direction of the nut 163, adjustments can be made to increase the initial gap of the stone clamping units 1813 and 1823 at their initial positions.

[0138] (Advantages of setting the ball screw shaft 161 as the driving side and the nut 163 as the driven side)

[0139] In this embodiment, as described above, in the motion conversion mechanism 160, the ball screw shaft 161 is driven to rotate by the motor 140, and the nut 163 is driven by the ball screw shaft 161 to perform linear motion in the first direction D1. In other words, in the first direction D1, the nut 163, as the driven side member, moves within the range of both ends of the ball screw shaft 161, which is the driving side member (moving in an overlapping manner with the ball screw shaft 161 in the first direction D1). Therefore, it is not necessary to specially set up a long and large space for the driven side member; the housing space (i.e., the second housing) can be designed based on the length dimension (long dimension) of the ball screw shaft 161, which is a long member. Accordingly, it is possible to avoid making the width dimension of the stone crushing tool 101 unnecessarily long and large for the movable part, and it is also possible to easily address dust prevention measures for the housing 110.

[0140] (Output shaft 143, ball screw shaft 161, extension direction of stone clamping direction C)

[0141] In this embodiment, as described above, the configuration is such that the extending direction of the output shaft 143 of the motor 140, the extending direction of the ball screw shaft 161 in the motion conversion mechanism 160 (i.e., the moving direction of the nut 163), and the stone holding direction C of the first arm 181 and the second arm 182 in the crushing section 180 are all parallel (refer to...). Figure 2 , 3 (e.g., 5). In addition, the stone holding direction C is defined as an approximately linear motion direction that moves in the tangential direction of the stone clamping parts 1813 and 1823 along with the mutual rotation of the first arm 181 and the second arm 182.

[0142] By arranging them in parallel, long components or movements can be concentrated in the width direction of the device, making the device structure more compact compared to arranging these structural elements in a cross pattern. Furthermore, when the output shaft 143 and the ball screw shaft 161 are arranged in parallel, for example, if they are configured to rotate in opposite directions, vibration and couple forces are reduced, which is beneficial.

[0143] (Battery 146 protection)

[0144] In this embodiment, such as Figure 1 As shown, the battery 146 is disposed in the upper part of the first housing 111 in the region 133 near the first handle. This region 133 is defined as the protective area surrounded by the pair of first handles 131, 131. Accordingly, it suppresses accidental external forces applied to the battery 146, preventing damage to the battery 146 or the battery mounting portion 149 (see reference 141). Figure 3 Damage to )

[0145] In addition, such as Figure 1 and Figure 3 As shown, the pair of first handles 131, 131 are open relative to the sliding mounting direction of the battery 146, thus simultaneously achieving both protection and sliding mounting of the battery 146.

[0146] According to this embodiment, a stone crushing tool 101 is provided that can avoid the complexity of the working environment through the above-described structure and working method.

[0147] Explanation of reference numerals in the attached figures

[0148] 101: Stone crushing tool; 110: Housing; 111: First housing; 112: Second housing; 113: Base of the second housing; 115: Movable part of the second housing; 1131, 1151: Crushing part connection; 116: Seal; 130: Handle; 131: First handle; 132: Second handle; 133: Area near the first handle; 135: Operating part; 1321, 1321: Second handle fixing part; 140: Motor ; 143: Output shaft; 144: Cooling fan; 145: Controller; 146: Battery; 147: Battery terminal; 149: Battery mounting part; 1471, 1491: Engaging protrusions; 150: Planetary gear reduction mechanism; 151: First gear; 152: Idle gear; 153: Second gear; 155: Connecting key; 160: Motion conversion mechanism; 161: Ball screw shaft (threaded part); 1611: First cap; 161 2: Second cap; 1613: Fixing screw; 163: Nut (nut part); 164: Radial bearing; 165: First thrust bearing; 166: Second thrust bearing; 171: Nut position detection mechanism; 175: Nut linkage detection component; 177: First position detection unit; 178: Second position detection unit; 179: Load sensor; 180: Crushing part; 181: First arm; 182: Second arm; 1811, 1821: ... 1 Connecting rod; 1812, 1822: Second connecting rod; 1813, 1823: Stone clamping part; 1814, 1824: Engaging part; 1815, 1825: Top protrusion; 1816, 1826: Middle protrusion; 183: Arm interconnection part; 185: Rotational motion conversion mechanism (handle linkage mechanism); D1: First direction (width direction); D2: Second direction (vertical direction); C: Stone clamping direction; W: Stone.

Claims

1. An electric stone crushing tool, characterized in that, It includes a motor, a motion conversion mechanism, a crushing section, a position detection section, a controller, and a stone crushing detection section, among which... The motor has an output shaft; The motion conversion mechanism converts the rotational output from the output shaft into linear motion; The crushing section clamps and crushes the stone through the linear motion of the motion conversion mechanism; The position detection unit detects the specified first and second positions during the crushing operation; The controller performs drive control of the motor based on the detection results of the position detection unit; If the stone is detected as broken before reaching the second position by the breakage detection unit, the motor is controlled to return to the first position before reaching the second position. Even if the stone is not detected as broken by the breakage detection unit, the motor is driven to return to the first position when the second position is detected by the position detection unit.

2. The electric stone crushing tool according to claim 1, characterized in that, The motion conversion mechanism is configured as a screw feed mechanism, which has a threaded portion and a nut portion that engages with the threaded portion.

3. The electric stone crushing tool according to claim 2, characterized in that, The output shaft is connected to the threaded portion and is configured such that the nut portion moves linearly along the threaded portion by the rotation of the threaded portion.

4. The electric stone crushing tool according to any one of claims 1 to 3, characterized in that, The crushing part has a clamping part that clamps the stone in a predetermined clamping direction, and is configured such that the linear motion direction of the motion conversion mechanism becomes the clamping direction.

5. The electric stone crushing tool according to claim 4, characterized in that, The configuration is such that the extension direction of the output shaft becomes the clamping direction.

6. The electric stone crushing tool according to any one of claims 1 to 3, characterized in that, It has a rotary motion conversion unit, which further converts the linear motion of the motion conversion mechanism into rotary motion, and the crushing unit crushes the stone through the rotary motion of the rotary motion conversion unit.

7. The electric stone crushing tool according to claim 1, characterized in that, The configuration is configured such that at least one of the first position and the second position can be changed.

8. The electric stone crushing tool according to any one of claims 1 to 3, characterized in that, A planetary gear reduction mechanism is disposed between the output shaft and the motion conversion mechanism.

9. The electric stone crushing tool according to any one of claims 1 to 3, characterized in that, It also has a handle for the operator to hold and a battery that drives the motor. The battery is located in the vicinity of the handle, which also serves as a battery protection unit.

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