A braking torque testing device for elevator brake

Abstract

The present invention relates to the technical field of elevator brake testing, and specifically to a braking torque testing device for an elevator brake, comprising a brake assembly of a traction wheel bearing mechanism arranged on the traction wheel bearing mechanism, a gate clearance regulating mechanism installed on the traction wheel bearing mechanism, and a constant pressure regulating mechanism installed on the gate clearance regulating mechanism. By setting an automatically operated gate clearance regulating mechanism, and setting a constant pressure regulating mechanism on the gate clearance regulating mechanism to replace the existing multiple bolts, when the brake plunger and the brake detection switch become unbalanced due to resistance during torque detection under the interference of two braking force arms, the gate clearance regulating mechanism and the constant pressure regulating mechanism can provide balanced regulating force to the two plungers and two brake detection switches of the brake, thereby effectively ensuring that the brake can be conveniently controlled during torque detection.

Description

Technical Field

[0001] The invention relates to the technical field of elevator brake testing, in particular to a braking torque testing device for an elevator brake. Background Art

[0002] The elevator brake is an important safety device of the elevator. Its safety and reliability are one of the important factors to ensure the safe operation of the elevator. When the power is on, the brake will generate a bidirectional electromagnetic thrust to separate the brake mechanism from the rotating part of the motor. When the power is off, the electromagnetic force disappears, and under the action of the external brake spring pressure, a friction brake with power-off braking is formed. It is mainly matched with the drive motor on the escalator traction machine to form an electromagnetic brake three-phase asynchronous motor for escalators. It is widely used in occasions where smooth parking, fast starting and safe braking can be achieved during power outages.

[0003] At present, the braking torque test of elevator brakes mainly relies on specific equipment for simulation experiments. During the experiment, the opening and closing gaps of the brake mechanism need to be frequently adjusted. At the moment when the two braking arms forcefully brake the brake mechanism, the two independent force arms compressed by the bolts will produce an uncontrollable gap under the action of resistance, which will cause the two force arms to offset from the brake mechanism. At the same time, frequent adjustment of the bolts on the brake detection switch and the bolts on the internal piston of the brake will cause the opening and closing gaps of the two braking arms to become unbalanced, which will cause friction obstruction to the retraction and release of the steel cable.

[0004] In view of this, the present invention designs a braking torque testing device for an elevator brake to solve the above problems. Summary of the invention

[0005] The present invention aims to solve one of the technical problems existing in the prior art or related technology.

[0006] To this end, the technical solution adopted in the present invention is:

[0007] A braking torque test device for an elevator brake comprises a traction sheave bearing mechanism, a brake assembly arranged on the traction sheave bearing mechanism, a gate clearance regulating mechanism installed on the traction sheave bearing mechanism, and a constant pressure regulating mechanism installed on the gate clearance regulating mechanism;

[0008] The traction sheave bearing mechanism comprises two brake arms;

[0009] The gate clearance regulating mechanism comprises two pressure-bearing members installed in the two brake arms, the pressure-bearing members are composed of an insert rod and a sleeve, and two short arms are respectively installed at the outer ends of the two insert rods, and a same-direction expansion assembly is connected between the two short arms, and the same-direction expansion assembly is used to provide balanced traction for the two short arms;

[0010] The constant pressure regulating mechanism comprises a support plate arranged in the same-direction expansion assembly, two inclined frames movably connected to the support plate, a pad connected to the bottom end of the inclined frame, and a pressure rod installed in the pad;

[0011] The brake assembly includes two plungers and two brake switches.

[0012] In a preferred example, the present invention can be further configured as follows: the traction sheave bearing mechanism further includes a wheel frame and a top seat mounted on the top of the wheel frame;

[0013] Two threaded guide rods are respectively installed at the two ends of the top seat, and two reinforcing springs are arranged on the two threaded guide rods, and nuts for pressing the reinforcing springs are installed on the threaded guide rods.

[0014] In a preferred example, the present invention can be further configured as follows: the brake arm is made of stainless steel material, and a vertical groove is formed at the top of the brake arm.

[0015] In a preferred example, the present invention can be further configured as follows: the gate clearance regulating mechanism further includes a base mounted on the top of the top seat, two distance measuring scales mounted on the base, a traction assembly mounted in the base, and two marking members mounted on the two short arms;

[0016] The marking piece is composed of a ring buckle, a fastening bolt, an end rod and a U-shaped marking head, and the U-shaped marking head is arranged outside the measuring ruler and is used to mark the gap after the brake arm is opened and closed.

[0017] In a preferred example, the present invention can be further configured as follows: the traction assembly includes an end plate, two clamps installed in the sockets on both sides of the end plate, a threaded sleeve installed on the top of the end plate, and an extended screw installed inside the threaded sleeve.

[0018] In a preferred example, the present invention can be further configured as follows: a rotating wheel is installed at the top of the lengthened screw, and a column head is installed at the bottom end of the lengthened screw, and the two clamps are adapted to clamp on both sides of the column head.

[0019] In a preferred example, the present invention can be further configured as follows: the same-direction distance expansion assembly includes two chucks mounted on the end plate, a guide bin mounted in the two chucks, a first control box mounted on the guide bin, a magnetic column arranged in the middle of the inner cavity of the guide bin, a coil arranged outside the magnetic column, two struts movably mounted in the cavities at both ends of the guide bin, and two first return compression springs arranged between the magnetic column and the two struts;

[0020] A nut is connected to the threaded section of the first return compression spring away from the guide bin, and a circular gasket bearing pressure on the short arm is arranged on the threaded section.

[0021] In a preferred example, the present invention can be further configured as follows: the constant pressure regulating mechanism further includes a screw barrel installed inside the support plate and a second return compression spring arranged outside the pressure rod;

[0022] The screw barrel is movably mounted on the outside of the extended screw.

[0023] In a preferred example, the present invention can be further configured as follows: the brake assembly also includes a brake compartment installed on the top of the base and a second control box installed on the top of the brake compartment, and the two wires at both ends of the second control box are respectively connected to the two brake switches.

[0024] In a preferred example, the present invention can be further configured as follows: the contact on the brake switch is pressed against the end of the pressure rod away from the pad;

[0025] The outer end of the plunger is installed in a hole at one end of the plunger away from the short arm.

[0026] By adopting the above technical solution, the beneficial effects achieved by the present invention are:

[0027] 1. The present invention provides an automatically operated gate clearance regulating mechanism, and a constant pressure regulating mechanism is provided on the gate clearance regulating mechanism to replace the existing multiple bolts. When the brake plunger and the brake detection switch become unbalanced due to resistance under the interference of two braking force arms during torque detection, the gate clearance regulating mechanism and the constant pressure regulating mechanism can provide balanced regulating force to the two brake plungers and two brake detection switches, thereby effectively ensuring that the brake can be conveniently controlled during torque detection.

[0028] 2. The present invention uses the gate clearance regulating mechanism to unidirectionally squeeze the pistons at both ends of the brake, and uses the constant pressure regulating mechanism to press the two detection switch contacts on the brake. At this time, the two braking force arms clamped in both directions can maintain a balanced gap with the disc body of the brake mechanism, thereby reducing the rotation obstruction of the brake force arm controlled by the bolt to the disc body of the brake mechanism due to the imbalance of clearance regulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the present invention when used;

[0030] Figure 2 is a schematic diagram of the traction sheave bearing mechanism of the present invention;

[0031] Figure 3 is a schematic diagram of the gate gap regulating mechanism of the present invention;

[0032] Figure 4 For the present invention Figure 3 Internal schematic diagram of

[0033] Figure 5For the present invention Figure 4 The enlarged schematic diagram of point A in the middle;

[0034] Figure 6 is a schematic diagram of a traction assembly of the present invention;

[0035] Figure 7 For the present invention Figure 6 The enlarged schematic diagram of point B in the middle;

[0036] Figure 8 is a schematic diagram of the control mechanism of the present invention;

[0037] Fig. 9 It is a dispersed schematic diagram of the control mechanism of the present invention;

[0038] Fig.10 For the present invention Fig. 9 Enlarged schematic diagram of point C in the middle.

[0039] Reference numerals:

[0040] 100, traction wheel bearing mechanism; 110, wheel frame; 120, top seat; 130, strengthening spring; 140, brake arm;

[0041] 200, gate clearance regulating mechanism; 210, base; 220, distance ruler; 230, traction assembly; 231, end plate; 232, clamp; 233, threaded sleeve; 234, extension screw; 240, same-direction distance expansion assembly; 241, clamp; 242, guide bin; 243, first control box; 244, magnetic column; 245, coil; 246, support rod; 247, first return compression spring; 250, short arm; 260, pressure-bearing member; 270, marking member;

[0042] 300, constant pressure regulating mechanism; 310, supporting plate; 320, screw barrel; 330, inclined frame; 340, foot pad; 350, pressure rod; 360, second return compression spring;

[0043] 400, brake assembly; 410, brake compartment; 420, second control box; 430, brake switch; 440, plunger. DETAILED DESCRIPTION

[0044] To make the purpose, technical solution and advantages of the present invention more clear, the present invention is further described in detail below in combination with specific implementations and with reference to the accompanying drawings. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0045] It is to be understood that these descriptions are exemplary only and are not intended to limit the scope of the invention.

[0046] A braking torque testing device for an elevator brake provided by some embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0047] Embodiment 1:

[0048] Combination Figure 1-Figure 10 As shown, a braking torque testing device for an elevator brake provided by the present invention comprises a traction sheave bearing mechanism 100, a brake assembly 400 arranged on the traction sheave bearing mechanism 100, a gate clearance regulating mechanism 200 installed on the traction sheave bearing mechanism 100, and a constant pressure regulating mechanism 300 installed on the gate clearance regulating mechanism 200.

[0049] The traction wheel bearing mechanism 100 includes a wheel frame 110, a top seat 120, a reinforcing spring 130 and a brake arm 140, and the brake clearance regulating mechanism 200 includes a base 210, a distance measuring ruler 220, a traction assembly 230, a same-direction distance expansion assembly 240, a short arm 250, a pressure bearing member 260 and a marking member 270, and the traction assembly 230 also includes an end plate 231, a clamp 232, a threaded sleeve 233 and an extension screw 234, and the same-direction distance expansion assembly 240 also includes a chuck 241, a guide bin 242, a first control box 243, a magnetic column 244, a coil 245, a support rod 246 and a first return spring 247, the constant pressure adjustment mechanism 300 includes a support plate 310, a screw barrel 320, a cantilever frame 330, a pad 340, a pressure rod 350 and a second return spring 360, and the brake assembly 400 includes a brake bin 410, a second control box 420, a brake switch 430 and a plunger 440.

[0050] The traction sheave bearing mechanism 100 includes a wheel frame 110, two brake arms 140, and a top seat 120 installed on the top of the wheel frame 110;

[0051] Two threaded guide rods are respectively installed at both ends of the top seat 120, and two reinforcing springs 130 are arranged on the two threaded guide rods, and nuts for compressing the reinforcing springs 130 are installed on the threaded guide rods;

[0052] The two threaded guide rods penetrate into the two brake arms 140 respectively, and the two reinforcing springs 130 are pressed against the outside of the two brake arms 140 by two nuts;

[0053] The brake arm 140 is made of stainless steel, and a vertical groove is formed at the top of the brake arm 140;

[0054] The brake clearance regulating mechanism 200 includes two pressure-bearing members 260 installed in the two brake arms 140. The pressure-bearing members 260 are composed of a plunger and a sleeve. Two short arms 250 are respectively installed at the outer ends of the two plungers. A same-direction expansion assembly 240 is connected between the two short arms 250. The same-direction expansion assembly 240 is used to provide balanced traction for the two short arms 250.

[0055] The constant pressure regulating mechanism 300 includes a support plate 310 disposed in the same-direction expansion assembly 240, two inclined frames 330 movably connected to the support plate 310, a pad 340 connected to the bottom end of the inclined frame 330, and a pressure rod 350 installed in the pad 340;

[0056] The brake assembly 400 includes two plungers 440 and two brake switches 430, a brake compartment 410 mounted on the top of the base 210, and a second control box 420 mounted on the top of the brake compartment 410, and two wires at both ends of the second control box 420 are respectively connected to the two brake switches 430;

[0057] The contact on the brake switch 430 is pressed on the end of the pressure rod 350 away from the pad 340;

[0058] The outer end of the plunger 440 is mounted in the hole at the end of the plunger away from the short arm 250 .

[0059] The braking torque test of the elevator brake mainly relies on specific equipment for simulation experiments. During the experiment, the opening and closing gaps of the brake mechanism need to be frequently adjusted. When the steel cable is stretched, the brake mechanism body will be subject to great resistance. At the moment when the two brake arms are forced to brake, the two brake arms will produce uncontrollable gaps under the action of resistance. In severe cases, the braking effect of the brake mechanism will be reduced. Frequent adjustment of the bolts on the brake detection switch and the bolts on the internal piston of the brake will cause the opening and closing gaps of the two brake arms to become unbalanced, which will cause friction to hinder the retraction and release of the steel cable.

[0060] The device replaces the bolts on the existing brake detection switch and the brake plunger, uses two pressure-bearing parts 260 that apply pressure in the same direction to regulate the pressure of the two plungers 440, and cooperates with two pressure rods 350 to clamp the contacts on the two brake switches 430 at a constant pressure. At this time, the two brake arms 140 arranged outside the two plungers 440 and the two brake switches 430 can maintain the same gap with the wheel frame 110. When the brake chamber 410 is fixed, the brake chamber 410 in a fixed position can provide a stable distance control platform for the two plungers 440. As the two plungers 440 are subjected to force When extended, the two pressure-bearing members 260 distributed at equal intervals can apply the same force to the two brake arms 140, and cooperate with the two constant-pressure rods 350 to calibrate the constant pressure of the contacts on the two brake switches 430. At this time, the two brake arms 140 can brake the brake mechanism. Finally, the two brake switches 430 can perform real-time detection of the reversely transmitted pressure to reduce the pressure imbalance caused by the offset of the distance between the two brake arms 140 and the brake mechanism due to bolt adjustment, thereby improving the accuracy of the two brake switches 430 in displaying the pressure after the two brake arms 140 are tightened at the same time.

[0061] Embodiment 2:

[0062] Combination Figure 3-Figure 8 As shown, on the basis of Example 1, the gate clearance regulating mechanism 200 further includes a base 210 mounted on the top of the top seat 120, two measuring scales 220 mounted on the base 210, a traction assembly 230 mounted in the base 210, and two marking members 270 mounted on two short arms 250, and positioning bolts are arranged in the notches in the two end plates of the base 210, and the positioning bolts are mounted on the top seat 120;

[0063] The marking member 270 is composed of a ring buckle, a fastening bolt, an end rod and a U-shaped marking head, and the U-shaped marking head is arranged on the outside of the measuring ruler 220, and is used to mark the gap after the brake arm 140 is opened and closed. A scale ruler is arranged on the outside of the measuring ruler 220, and the scale ruler cooperates with the U-shaped marking head to measure the gap of the brake arm 140 gate in real time.

[0064] The traction assembly 230 includes an end plate 231, two clamps 232 installed in the insertion holes on both sides of the end plate 231, a threaded sleeve 233 installed on the top of the end plate 231, and an extended screw 234 installed inside the threaded sleeve 233;

[0065] A rotating wheel is installed on the top of the extended screw 234, and a column head is installed on the bottom of the extended screw 234, and two clamps 232 are adapted to clamp on both sides of the column head;

[0066] The constant pressure regulating mechanism 300 further includes a screw barrel 320 installed inside the support plate 310 and a second return compression spring 360 arranged outside the pressure rod 350;

[0067] The screw barrel 320 is movably mounted on the outside of the extended screw rod 234 .

[0068] By controlling the rotating wheel at the top of the extended screw 234 to rotate counterclockwise, the screw barrel 320 will be lifted upward along the outside of the extended screw 234, and the pushed support plate 310 will simultaneously pull the two inclined frames 330. At this time, the extended screw 234 drives the screw barrel 320 and the support plate 310 to rise and fall stably, thereby providing a balanced thrust for the two pressure rods 350, and finally applying a constant pressure to the contacts of the two brake switches 430. At this time, the two brake switches 430 can accurately display the pressure after braking of the two brake arms 140, so as to reduce the error caused by the imbalance of the gap of the brake switch 430 under the existing bolt compression.

[0069] Embodiment 3:

[0070] Combination Figure 3-Figure 10As shown, on the basis of Example 2, the same-direction extension assembly 240 includes two clamps 241 installed on the end plate 231, a guide bin 242 installed in the two clamps 241, a first control box 243 installed on the guide bin 242, a magnetic column 244 arranged in the middle of the inner cavity of the guide bin 242, a coil 245 arranged outside the magnetic column 244, two struts 246 movably installed in the cavities at both ends of the guide bin 242, and two first return compression springs 247 arranged between the magnetic column 244 and the two struts 246;

[0071] The magnetic column 244 is located in the middle of the inner cavity of the guide chamber 242;

[0072] A nut is connected to the threaded section of the first return compression spring 247 away from the guide bin 242 , and a circular gasket bearing pressure on the short arm 250 is arranged on the threaded section.

[0073] When the first control box 243 is not operating, the two first return compression springs 247 will simultaneously push the two support rods 246 to extend outward. At this time, the two support rods 246 will provide a constant traction force for the two short arms 250 and the insertion rods in the two pressure-bearing parts 260. When the two insertion rods are compressed and apply pressure to the two plungers 440, the pressure exerted on the two plungers 440 is constant. As the two brake arms 140 brake the brake mechanism, the braking force acting in the opposite direction will not cause an unbalanced squeezing pressure on the two plungers 440, thereby preventing the two plungers 440 from being damaged under inconsistent pressure.

[0074] The working principle and use process of the present invention are as follows: the base 210 is pre-installed on the top of the reinforcing spring 130, and the end plate 231 is fixedly installed inside the base 210, and two measuring rulers 220 are fixedly installed on the outer wall of the base 210 by using multiple bolts, and then the same-direction expansion assembly 240 is installed on the outside of the end plate 231 by using two locking bolts. At this time, two support rods 246 are movably installed at both ends of the clamp 241, and two short arms 250 are respectively installed at the outer ends of the two support rods 246. At this time, the other end of the short arm 250 is installed with a horizontal pressure-bearing member 260. When the insertion rod in the pressure-bearing member 260 penetrates into the interior of the brake arm 140, it is installed in the insertion rod. The sleeve on the rod will cooperate with the short arm 250 to press against the outside of the brake arm 140. At this time, the two plug rods will press and fix the two plungers 440. The two support rods 246 in the initial state will be pressed by the two first return compression springs 247. The two support rods 246 will be in the longest state. Then the column head at the bottom end of the extension screw 234 will be inserted into the vertical hole inside the end plate 231, and the two clamps 232 will be installed in the sockets on both sides of the end plate 231. At this time, the two clamps 232 can position and clamp the column head at the bottom end of the extension screw 234. When the rotating wheel at the top of the control extension screw 234 is rotated, the screw barrel 320 will move along the outside of the extension screw 234. The two inclined frames 330 pulled by the support plate 310 will cooperate with the two pads 340 to apply a balanced squeezing force to the two pressure rods 350. At this time, the two pressure rods 350 can press the contacts on the two brake switches 430. When the brake compartment 410 and the two plungers 440 brake the winding wheel of the express, once the closing gap of the two brake arms 140 is too large, the operation of the first control box 243 is regulated by the numerical control panel, and the two ends of the magnetic column 244 under magnetic attraction will simultaneously pull the two support rods 246. Finally, the two plug rods will calibrate and regulate the two plungers 440 at the same time. At this time, the opening of the two brake arms 140 The gap between the gate and the gate can be monitored in real time under the calibration of the distance between the measuring ruler 220 and the marking piece 270. On this basis, the extension screw 234 is subsequently adjusted to rotate. At this time, the screw barrel 320 and the support plate 310 lifted upward along the outside of the extension screw 234 will pull the two inclined frames 330 at the same time. Under the stretching action of the two pads 340, the two symmetrically distributed pressure rods 350 can apply balanced pressure to the contacts on the two brake switches 430. At this time, the detection device can avoid the imbalance of the bolt under the independent adjustment of the existing plunger 440 and the brake switch 430, thereby ensuring the consistency of the opening and closing gaps of the two brake arms 140.

[0075] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A braking torque test device for an elevator brake, comprising a traction sheave bearing mechanism (100), and a brake assembly (400) arranged on the traction sheave bearing mechanism (100), characterized in that: It also includes a gate gap regulating mechanism (200) installed on the traction sheave bearing mechanism (100) and a constant pressure regulating mechanism (300) installed on the gate gap regulating mechanism (200); The traction sheave bearing mechanism (100) comprises two brake arms (140); The gate clearance regulating mechanism (200) comprises two pressure-bearing members (260) installed in the two brake arms (140), the pressure-bearing members (260) being composed of an insertion rod and a sleeve, and two short arms (250) being respectively installed at the outer ends of the two insertion rods, a same-direction expansion assembly (240) being connected between the two short arms (250), and the same-direction expansion assembly (240) being used to provide balanced traction for the two short arms (250); The constant pressure regulating mechanism (300) comprises a support plate (310) disposed in a same-direction expansion assembly (240), two inclined frames (330) movably connected to the support plate (310), a pad foot (340) connected to the bottom end of the inclined frame (330), and a pressure rod (350) installed in the pad foot (340); The brake assembly (400) comprises two plungers (440), two brake switches (430), a brake chamber (410) mounted on the top of the base (210), and a second control box (420) mounted on the top of the brake chamber (410), and two wires at both ends of the second control box (420) are respectively connected to the two brake switches (430); The contact on the brake switch (430) bears pressure on the end of the pressure rod (350) away from the pad foot (340); The outer end of the plunger (440) is mounted in a hole at an end of the insertion rod away from the short arm (250).

2. The braking torque testing device for an elevator brake according to claim 1, characterized in that: The traction wheel bearing mechanism (100) further comprises a wheel frame (110) and a top seat (120) mounted on the top of the wheel frame (110); Two threaded guide rods are respectively installed at both ends of the top seat (120), and two reinforcing springs (130) are arranged on the two threaded guide rods. Nuts for pressing the reinforcing springs (130) are installed on the threaded guide rods.

3. The braking torque testing device for an elevator brake according to claim 1, characterized in that: The brake arm (140) is made of stainless steel, and a vertical groove is provided at the top of the brake arm (140).

4. The braking torque testing device for an elevator brake according to claim 2, characterized in that: The gate clearance regulating mechanism (200) further comprises a base (210) mounted on the top of the top seat (120), two measuring scales (220) mounted on the base (210), a traction assembly (230) mounted in the base (210), and two marking members (270) mounted on the two short arms (250); The marking member (270) is composed of a ring buckle, a fastening bolt, an end rod and a U-shaped marking head, and the U-shaped marking head is arranged outside the measuring ruler (220) and is used to mark the gap after the brake arm (140) is opened and closed.

5. The braking torque testing device for an elevator brake according to claim 4, characterized in that: The traction assembly (230) comprises an end plate (231), two clamps (232) installed in the insertion holes on both sides of the end plate (231), a threaded sleeve (233) installed on the top of the end plate (231), and an extended screw rod (234) installed inside the threaded sleeve (233).

6. The braking torque testing device for an elevator brake according to claim 5, characterized in that: A rotating wheel is installed on the top of the lengthened screw rod (234), and a column head is installed on the bottom end of the lengthened screw rod (234), and the two clamps (232) are adapted to clamp on both sides of the column head.

7. The braking torque testing device for an elevator brake according to claim 1, characterized in that: The same-direction distance expansion assembly (240) comprises two clamps (241) mounted on the end plate (231), a guide bin (242) mounted in the two clamps (241), a first control box (243) mounted on the guide bin (242), a magnetic column (244) disposed in the middle of the inner cavity of the guide bin (242), a coil (245) disposed outside the magnetic column (244), two support rods (246) movably mounted in the cavities at both ends of the guide bin (242), and two first return compression springs (247) disposed between the magnetic column (244) and the two support rods (246); A nut is connected to the threaded section of the first return compression spring (247) away from the guide bin (242), and a circular gasket bearing pressure on the short arm (250) is provided on the threaded section.

8. The braking torque testing device for an elevator brake according to claim 1, characterized in that: The constant pressure regulating mechanism (300) further comprises a screw barrel (320) installed inside the supporting plate (310) and a second return compression spring (360) arranged outside the compression rod (350); The screw barrel (320) is movably mounted outside the extended screw rod (234).

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