A linear servo testing device

Abstract

This invention discloses a linear servo testing device, relating to the field of UAV accessory technology. It includes a fuselage with a hydraulic cylinder and a fixed base mounted on it, and a dynamic loading mechanism. The dynamic loading mechanism includes a sliding frame fixed to the fuselage, located between the hydraulic cylinder and the fixed base, and internally slidably connected to a load block. The load block has a conical component and two symmetrically arranged inclined blocks slidably connected internally. This application utilizes the linear servo's self-extension and retraction to drive the load block to slide, testing the load capacity of the linear servo under operating conditions. This improves the realism of the test results, and the load size can be adjusted arbitrarily, facilitating the detection of the linear servo's operation under certain load conditions. Furthermore, as the linear servo moves the load block, the friction between the friction plate and the inner wall of the sliding frame gradually increases, simulating the scenario of gradually increasing load during linear servo operation, making the test data more closely reflect actual usage effects.

Description

Technical Field

[0001] This invention relates to the field of unmanned aerial vehicle (UAV) accessory technology, and in particular to a linear servo testing device. Background Technology

[0002] A linear servo is a high-precision actuator that converts electrical signals into linear displacement. It mainly consists of a motor, power conversion mechanism, position feedback module, and control module, and is widely used in critical transmission and control components of unmanned aerial vehicles (UAVs). It is a key component for ensuring the stability of UAV flight attitude and ground operation. To ensure the production quality of linear servos, load testing is required before they are put into use.

[0003] Existing testing equipment uses hydraulic cylinders to apply pressure to the telescopic end of a linear servo to test its load capacity. This design is functionally limited, only measuring the load capacity of the linear servo in a static state. However, in practical applications, linear servos are more often in dynamic operation, and their load capacity is affected by factors such as speed, acceleration, and start-stop shocks. Therefore, the test data from existing equipment cannot accurately reflect the load capacity of the linear servo under operating conditions, resulting in low representativeness. Moreover, the load on the telescopic end of the linear servo changes during actual operation. Therefore, to improve the accuracy of test results, it is urgent to design a new linear servo testing device. Summary of the Invention

[0004] The purpose of this invention is to provide a linear servo testing device to address the problem that traditional testing equipment can only measure the load capacity of a linear servo in a static state, resulting in low representativeness of the test results and an inability to simulate the load changes at the telescopic end of the linear servo during operation.

[0005] To achieve the above objectives, the present invention employs the following technology: a linear servo test device comprising a body, on which a hydraulic cylinder and a fixed base are mounted, and a dynamic loading mechanism, wherein the dynamic loading mechanism comprises a sliding frame fixed to the body, the sliding frame being located between the hydraulic cylinder and the fixed base and having a load block slidably connected inside, the load block having a tapered component and two symmetrically arranged inclined blocks slidably connected inside, the load block having a threaded rod rotatably connected to the tapered component, and friction plates being fixed to opposite sides of the two inclined blocks by means of spring telescopic rods; and a drive assembly and a switching unit being provided inside the sliding frame.

[0006] When the linear servo pushes and pulls the slide frame, the drive assembly drives the threaded rod to rotate, causing the tapered part to squeeze the inclined block and the spring telescopic rod, thus changing the magnitude of the friction force between the friction plate and the inner wall of the slide frame.

[0007] As a further description of the linear servo test device of the above-mentioned technology: the drive assembly includes a bevel gear one rotatably connected inside the slide frame, a transmission gear slidably connected to the bottom of the bevel gear one, and bevel gear two rotatably connected to the load block on both sides of the bevel gear one, and a rack fixed to the inner wall of the slide frame.

[0008] As a further description of the linear servo test device of the above-mentioned technology: the switching unit includes a shaft with one end passing through a bevel gear and fixed to the transmission gear, and the other end passing through the top wall of the load block. Two racks are provided and arranged opposite to each other, with a height difference between the two racks, and at most one rack meshes with the transmission gear.

[0009] As a further description of the linear servo testing equipment described above: a mounting plate is fixed to the top of the load block, and three equally spaced annular positioning grooves are provided on the shaft. The mounting plate is elastically connected to a positioning pin embedded in the positioning groove.

[0010] As a further description of the linear servo test equipment described above, it also includes a torque test mechanism, which includes a connecting cylinder and a connector rotatably connected to one end of a load block. The outer end of the connecting cylinder extends into the interior of the connector, and a torsion spring is provided between the connecting cylinder and the connector.

[0011] As a further description of the linear servo test device described above: the dynamic loading mechanism also includes two connecting units, each of which includes a connecting rod that is slidably connected between the connecting cylinder and bevel gear two, the threaded rod and another bevel gear two, and a paddle is rotatably connected to the connecting rod.

[0012] As a further description of the linear servo test equipment described above: another connector is fixed to one end of the load block near the hydraulic cylinder.

[0013] As a further description of the linear servo test equipment described above: a tension spring is fixed between the friction plate and the outer wall of the load block.

[0014] In summary, due to the adoption of the above-mentioned technology in the linear servo testing equipment, the beneficial effects of this invention are:

[0015] 1. Twisting the shaft drives the threaded rod to rotate through bevel gear one, bevel gear two and connecting rod, causing the conical part to slide and push the inclined block. Through the spring telescopic rod, the friction plate is driven to contact the inner wall of the sliding frame, and the spring telescopic rod is compressed to adjust the friction between the friction plate and the inner wall of the sliding frame, thereby adjusting the load when the linear servo pushes and pulls the load block. Compared with the existing device, this application uses the linear servo to extend and retract to drive the load block to slide, and tests the load capacity of the linear servo under the operating state, which improves the authenticity of the test results. Moreover, the load size can be adjusted at will, which is convenient for testing the operating status of the linear servo under a certain load state.

[0016] Furthermore, when the linear servo moves the load block, the rack drives the transmission gear to rotate, which in turn drives the second bevel gear to rotate through the first bevel gear. Through the transmission of the above components, the friction between the friction plate and the inner wall of the slide frame can gradually increase until the linear servo can no longer move the load block. This directly tests the upper limit of the axial load of the linear servo. Moreover, this design can also simulate the scenario of the load gradually increasing during the operation of the linear servo, and the test data is more in line with the actual use effect.

[0017] 2. When the linear servo moves the load block, the transmission gear drives the first bevel gear to rotate, which in turn drives the connecting cylinder to rotate through the second bevel gear and the connecting rod. This causes the torsion spring to tighten, and a torsional load is applied to the telescopic end of the linear servo through the connector, thus testing the linear servo's resistance to torsional load and enriching the testing dimensions. Furthermore, this application can combine axial load and torsional load tests simultaneously to test the linear servo, detecting its torsional resistance under axial load. This comprehensively evaluates the combined stress states that the linear servo may experience in practical applications, avoiding performance misjudgments due to single-dimensional testing and improving the comprehensiveness and accuracy of the test. Attached Figure Description

[0018] Figure 1 An overall schematic diagram according to the present invention is shown;

[0019] Figure 2 A schematic diagram of a rack according to the present invention is shown;

[0020] Figure 3 An overall top view according to the present invention is shown;

[0021] Figure 4 A side view of the dynamic loading mechanism according to the present invention is shown;

[0022] Figure 5 A schematic cross-sectional view of the load block according to the present invention is shown;

[0023] Figure 6 The present invention is shown Figure 5 Enlarged view of point A in the middle;

[0024] Figure 7 A schematic diagram of a threaded rod according to the present invention is shown;

[0025] Figure 8 The present invention is shown Figure 7 Enlarged view at point B in the middle;

[0026] Figure 9 A schematic diagram of the friction plate according to the present invention is shown;

[0027] Figure 10 An exploded view of the torque testing mechanism according to the present invention is shown.

[0028] Legend:

[0029] 10. Machine body; 11. Hydraulic cylinder; 12. Mounting base;

[0030] 20. Dynamic loading mechanism; 21. Sliding frame; 22. Load block; 23. Drive assembly; 231. Transmission gear; 232. Bevel gear one; 233. Bevel gear two; 234. Rack; 24. Switching unit; 241. Shaft; 242. Mounting plate; 243. Positioning pin; 25. Connecting unit; 251. Connecting rod; 252. Paddle; 26. Threaded rod; 27. Conical part; 28. Inclined block; 29. ​​Spring telescopic rod; 210. Friction plate; 211. Tension spring;

[0031] 30. Torque testing mechanism; 31. Connecting cylinder; 32. Connector; 33. Torsion spring. Detailed Implementation

[0032] The following will describe, with reference to the accompanying drawings of the embodiments of the present invention, a linear servo testing device according to the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] like Figures 1-10 As shown, the present invention provides a linear servo testing device, which includes a body 10, on which a hydraulic cylinder 11 and a fixed base 12 are installed. The hydraulic cylinder 11 is used to place the linear servo to be tested, and the fixed base 12 is used to load the linear servo in a stationary state to test the load capacity of the linear servo in a stationary state.

[0034] In order to test the load capacity of the linear servo in operation and simulate load changes, a dynamic loading mechanism 20 is installed on the body 10 at the position of the hydraulic cylinder 11 and the fixed seat 12. The dynamic loading mechanism 20 includes a slide frame 21 fixed on the body 10, and a load block 22 is slidably connected inside the slide frame 21 through a slide rail.

[0035] Reference Figure 7 The load block 22 has a tapered part 27 and two symmetrically arranged inclined blocks 28 slidably connected inside. The inclined surfaces of the two inclined blocks 28 face the tapered part 27 and are inlaid with steel balls. The steel balls contact the inclined surfaces of the tapered part 27 to reduce the friction between the contact surfaces of the tapered part 27 and the inclined blocks 28 when they move. The load block 22 has a threaded rod 26 rotatably connected inside and threaded to the tapered part 27. The opposite sides of the two inclined blocks 28 are fixed with friction plates 210 slidably connected to the load block 22 by spring telescopic rods 29. A tension spring 211 that is always in a stretched state is fixed between the friction plate 210 and the outer wall of the load block 22.

[0036] After the linear servo is fixed by the mounting base 12, when the extension end of the linear servo is extended to push the load block 22, the threaded rod 26 rotates, causing the conical part 27 to slide axially inside the load block 22. The conical part 27 presses against the inclined surface of the inclined block 28, causing the two inclined blocks 28 to move towards the inner wall of the slide frame 21. The inclined blocks 28 drive the friction plate 210 to move through the spring extension rod 29, so that the friction plate 210 abuts against the inner wall of the slide frame 21. The tension spring 211 is further stretched, and the friction between the friction plate 210 and the inner wall of the slide frame 21 will hinder the sliding of the load block 22. As the moving distance of the conical part 27 increases, the moving distance of the inclined block 28 increases, the degree of compression of the spring extension rod 29 increases, and the pressure on the friction plate 210 increases, which increases the friction between it and the inner wall of the slide frame 21.

[0037] Similarly, when the threaded rod 26 rotates in the opposite direction to drive the tapered part 27 to move in the opposite direction, the compression degree of the spring telescopic rod 29 decreases, and the moving distance of the inclined block 28 decreases. After the length of the spring telescopic rod 29 is restored, the tapered part 27 continues to move in the opposite direction. The tension spring 211 pulls the friction plate 210 to reset through its elastic force, thereby driving the spring telescopic rod 29 and the inclined block 28 to reset, so that the friction plate 210 disengages from the inner wall of the slide frame 21.

[0038] Based on the above design, by rotating the threaded rod 26, the magnitude of the friction force between the friction plate 210 and the inner wall of the slide frame 21 can be controlled, thereby adjusting the extension resistance of the linear servo's telescopic end. By changing the load on the telescopic end of the linear servo while it is in operation, the load capacity of the linear servo in operation can be tested. Compared with testing the load capacity by applying pressure to a stationary linear servo, this test result can better reflect the load capacity of the linear servo in actual use.

[0039] When the linear servo drives the actuator to approach the workpiece and gradually presses it, the contact pressure will increase with the increase of the propulsion stroke. In similar scenarios, the load on the extension end of the linear servo will increase continuously and gradually. Therefore, during the extension process of the extension end of the linear servo, the continuous rotation of the threaded rod 26 can also increase the friction between the friction plate 210 and the inner wall of the slide frame 21, thereby simulating the change of the load on the extension end when the linear servo is actually used, and further improving the authenticity of the test results.

[0040] Reference Figure 4 , Figure 5 and Figure 6 The sliding frame 21 is provided with a drive assembly 23. The drive assembly 23 includes a bevel gear 232 rotatably connected to the inside of the sliding frame 21. A transmission gear 231 is slidably connected to the bottom of the bevel gear 232. Both sides of the bevel gear 232 are meshed with bevel gears 233 rotatably connected to the load block 22. A rack 234 is fixed to the inner wall of the sliding frame 21.

[0041] After the rack 234 meshes with the transmission gear 231, when the linear servo pushes and pulls the load block 22, the load block 22 slides in the slide frame 21, causing the transmission gear 231 to move together. Under the push of the rack 234, the transmission gear 231 rotates during the movement, and then drives the threaded rod 26 to rotate through the transmission of bevel gear 1 232 and bevel gear 233. Therefore, when testing the load in the linear servo's operating state, the threaded rod 26 can be automatically rotated through the drive component 23, thereby automatically changing the load at the extension end of the linear servo. This design is not only simple in structure, but also allows the load to increase or decrease with the increase of the linear servo's stroke, meeting the load change requirements during simulated real-world testing.

[0042] In order to enable manual adjustment of the load size, a switching unit 24 is also provided. The switching unit 24 includes a shaft 241 with one end passing through a bevel gear 232 and fixed to the transmission gear 231, and the other end passing through the top wall of the load block 22. The shaft 241 is slidably connected to the bevel gear 232. Twisting the shaft 241 can drive the transmission gear 231 and the bevel gear 232 to rotate, so that the bevel gear 232 drives the threaded rod 26 to rotate through the bevel gear 233, thereby adjusting the friction between the friction plate 210 and the inner wall of the slide frame 21, and realizing the adjustment of the load size.

[0043] In addition, considering that the meshing of the transmission gear 231 and the rack 234 will restrict the rotation of the shaft 241, the shaft 241 can slide downward in the load block 22, causing the transmission gear 231 to move down and disengage from the rack 234, and then the load can be adjusted by turning the shaft 241.

[0044] The top of the load block 22 is fixed with a mounting plate 242. The shaft 241 is provided with an annular positioning groove. The mounting plate 242 is elastically connected with a positioning pin 243 embedded in the positioning groove. The positioning pin 243 is used to limit the shaft 241 after the shaft 241 slides up and down to adjust its position, and will not hinder the rotation of the shaft 241.

[0045] Two racks 234 are provided and arranged opposite each other, with a height difference between the two racks 234. At most one rack 234 meshes with the transmission gear 231. Three annular positioning grooves are provided and are evenly distributed on the shaft 241. When the shaft 241 is in the highest position, the positioning pin 243 is inserted into the lowest annular positioning groove, and the transmission gear 231 meshes with the rack 234 at the highest position. When the shaft 241 slides down and the positioning pin 243 is inserted into the middle annular positioning groove, the transmission gear 231 meshes with the rack 234 at the lowest position. By switching the rack 234 meshing with the transmission gear 231, the rotation direction of the transmission gear 231 can be controlled when the linear servo is pushed or pulled, thereby controlling the rotation direction of the threaded rod 26, controlling the increase or decrease of the load, and improving the ease of use of the device.

[0046] When the shaft 241 is in the lowest position, the locating pin 243 is inserted into the uppermost annular locating groove. At this time, the transmission gear 231 is disengaged from the two racks 234. By rotating the shaft 241, the transmission gear 231 and the bevel gear 232 are rotated to adjust the load size.

[0047] Reference Figure 6 , Figure 7 and Figure 8 To test the torsional strength of the telescopic end of the linear servo, a torque testing mechanism 30 is provided on the load block 22 near the linear servo. The torque testing mechanism 30 includes a connecting cylinder 31 and a connector 32 rotatably connected to one end of the load block 22. The axes of the sliding frame 21 and the connector 32 coincide. The outer end of the connecting cylinder 31 extends into the interior of the connector 32, and a torsion spring 33 is provided between the connecting cylinder 31 and the connector 32. After the connector 32 is fixed to the telescopic end of the linear servo, the torsion spring 33 can be tightened by rotating the connecting cylinder 31. The torsion spring 33 applies a torsional force to the connector 32 to test the ability of the telescopic end of the linear servo to resist torsional load.

[0048] Reference Figure 8 and Figure 10A connecting unit 25 is provided between the connecting cylinder 31 and the adjacent bevel gear 233, and between the threaded rod 26 and another bevel gear 233. The connecting unit 25 includes a connecting rod 251. The two connecting rods 251 are slidably connected between the connecting cylinder 31 and the bevel gear 233, and between the threaded rod 26 and another bevel gear 233, respectively. A paddle 252 is rotatably connected to the connecting rod 251. The top end of the paddle 252 extends from the top of the load block 22 and is slidably connected to the load block 22.

[0049] By moving the paddle 252, the connecting rod 251 can be moved axially, causing one end of the connecting rod 251 to disengage from the second bevel gear 233, cutting off the transmission between the connecting cylinder 31 and the second bevel gear 233, and between the threaded rod 26 and the second bevel gear 233. This allows the torque testing mechanism 30 to be used independently with the help of the drive assembly 23 and the switching unit 24 to test the torsional strength of the linear servo's telescopic end, or to be used in conjunction with the dynamic loading mechanism 20 to test the load and torsional resistance of the linear servo in operation.

[0050] Another connector 32 is fixed to one end of the load block 22 near the hydraulic cylinder 11. The extension end of the hydraulic cylinder 11 can be fixed to the load block 22 through the connector 32. The load and torsional resistance of the linear servo motor in a stationary state are tested by moving the load block 22 through the hydraulic cylinder 11.

[0051] It is worth mentioning that when the load block 22 is driven by the hydraulic cylinder 11 to perform a load test on the linear servo in a stationary state, if the linear servo is damaged and the telescopic end suddenly loses support, the telescopic end of the hydraulic cylinder 11 will move forward. At this time, the hydraulic cylinder 11 will push the load block 22 to slide. The increased friction between the friction plate 210 and the slide frame 21 can also play a braking role, effectively avoiding equipment collisions and component damage caused by the uncontrolled movement of the hydraulic cylinder 11, and improving the safety of the test process.

[0052] Working principle: In the initial state, shaft 241 is at its highest point, and positioning pin 243 is embedded in the annular positioning groove of shaft 241 to prevent shaft 241 from sliding up and down. Transmission gear 231 meshes with one of the racks 234, and one of the connecting rods 251 retracts into the connecting cylinder 31, so that the connecting cylinder 31 is disengaged from the second bevel gear 233. The other connecting rod 251 is slidably connected between the second bevel gear 233 and the threaded rod 26, and the friction plate 210 does not contact the inner wall of the slide frame 21.

[0053] During the axial load test, the linear servo is fixed by the mounting base 12, and the telescopic end of the linear servo is fixed to the connector 32. The shaft 241 is manually pressed down to move it to its lowest position. At this time, the locating pin 243 is inserted into the annular locating groove at the highest position, and the transmission gear 231 disengages from the rack 234. Tightening the shaft 241 drives the bevel gear 233 to rotate. The bevel gear 233 drives the threaded rod 26 to rotate through the connecting rod 251. The rotation of the threaded rod 26 drives the conical part 27 to rotate on the load block 2. 2. Internal sliding: The conical part 27 presses against the inclined surface of the inclined block 28, causing the inclined block 28 to move away from the conical part 27. The inclined block 28 causes the spring telescopic rod 29 and the friction plate 210 to move, so that the friction plate 210 contacts the inner wall of the slide frame 21 and the spring telescopic rod 29 is compressed. At this time, the friction between the friction plate 210 and the inner wall of the slide frame 21 will increase the moving resistance of the load block 22. The load capacity of the linear servo in the running state can be tested by driving the load block 22 to slide in the slide frame 21 through the linear servo.

[0054] After adjusting the initial load in the above manner, the shaft 241 drives the transmission gear 231 to reset, so that the transmission gear 231 meshes with the rack 234. When the linear servo pushes the load block 22, the rack 234 will drive the transmission gear 231 to rotate, thereby driving the bevel gear 233 to rotate through the first bevel gear 232. As the load block 22 slides, the friction between the friction plate 210 and the inner wall of the slide frame 21 gradually increases until the linear servo can no longer drive the load block 22 to move. This tests the maximum load that the linear servo can withstand under the operating state. At the same time, this design can also simulate the load change at the telescopic end of the linear servo during operation, improving the authenticity of the test data.

[0055] When testing the torsional load resistance of the linear servo, the paddle 252 is moved axially to drive the connecting rod 251 inside the connecting cylinder 31, so that one end of the connecting rod 251 extends into the bevel gear 233. Then, the other paddle 252 is moved to drive the other connecting rod 251 out of the bevel gear 233. At this time, when the linear servo pushes the load block 22, the transmission gear 231 drives the bevel gear 233 to rotate through the bevel gear 232, so that the connecting cylinder 31 rotates and tightens the torsion spring 33, applying a torsional load to the connector 32 and the telescopic end of the linear servo.

[0056] When both connecting rods 251 are embedded inside the bevel gear 233, the linear servo pushes the load block 22, which can simultaneously test the linear servo's ability to resist axial load and torsional load, enriching the test dimensions.

[0057] When the telescopic end of the hydraulic cylinder 11 is fixed to the load block 22 via the connector 32, the hydraulic cylinder 11 pushes or pulls the load block 22 to test the linear servo's resistance to axial and torsional loads in a stationary state.

[0058] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technology of the linear servo test device and the inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A linear servo testing device, comprising a body (10), wherein a hydraulic cylinder (11) and a fixed base (12) are mounted on the body (10), characterized in that, It also includes a dynamic loading mechanism (20), which includes a slide frame (21) fixed on the body (10). The slide frame (21) is located between the hydraulic cylinder (11) and the fixed seat (12) and has a load block (22) slidably connected inside. The load block (22) has a conical part (27) and two symmetrically arranged inclined blocks (28) slidably connected inside. The load block (22) has a threaded rod (26) rotatably connected to the conical part (27). The opposite sides of the two inclined blocks (28) are fixed with friction plates (210) by spring telescopic rods (29). The slide frame (21) is provided with a drive assembly (23) and a switching unit (24). The drive assembly (23) includes a bevel gear 1 (232) rotatably connected inside the slide frame (21), a transmission gear (231) slidably connected to the bottom of the bevel gear 1 (232), and bevel gear 2 (233) meshing with both sides of the bevel gear 1 (232) and rotatably connected to the load block (22). A rack (234) is fixed to the inner wall of the slide frame (21). The switching unit (24) includes a shaft (241) that passes through a bevel gear (232) and is fixed to a transmission gear (231) at one end, and passes through the top wall of the load block (22) at the other end. There are two racks (234) arranged opposite to each other. There is a height difference between the two racks (234), and at most one rack (234) meshes with the transmission gear (231). When the linear servo pushes and pulls the slide frame (21), the drive assembly (23) drives the threaded rod (26) to rotate, causing the tapered part (27) to squeeze the inclined block (28) and the spring telescopic rod (29), thereby changing the magnitude of the friction force between the friction plate (210) and the inner wall of the slide frame (21).

2. The linear servo testing equipment according to claim 1, characterized in that, The top of the load block (22) is fixed with a mounting plate (242), and the shaft (241) has three equally spaced annular positioning grooves. The mounting plate (242) is elastically connected with a positioning pin (243) embedded in the positioning groove.

3. The linear servo testing equipment according to claim 1, characterized in that, It also includes a torque testing mechanism (30), which includes a connecting cylinder (31) and a connector (32) rotatably connected to one end of the load block (22). The outer end of the connecting cylinder (31) extends into the interior of the connector (32), and a torsion spring (33) is provided between the connecting cylinder (31) and the connector (32).

4. The linear servo testing equipment according to claim 1, characterized in that, The dynamic loading mechanism (20) also includes two connecting units (25), each of which includes a connecting rod (251) that is slidably connected between the connecting cylinder (31) and the second bevel gear (233), the threaded rod (26) and the other second bevel gear (233), and a paddle (252) is rotatably connected to the connecting rod (251).

5. The linear servo testing equipment according to claim 1, characterized in that, Another connector (32) is fixed to one end of the load block (22) near the hydraulic cylinder (11).

6. The linear servo testing equipment according to claim 1, characterized in that, A tension spring (211) is fixed between the outer wall of the friction plate (210) and the load block (22).

Images